Celestron SLT/GT Wedge For Budget Wide Field AP

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JayTee
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Celestron SLT/GT Wedge For Budget Wide Field AP

#1

Post by JayTee »

In an effort to increase our footprint on Google with articles that are germane to our forums, here is a reprint of an article I wrote and posted over at AF a few years ago. I think this information is still very pertinent to those beginning AP on a budget.

Constructing an Equatorial Wedge for the Celestron SLT/GT Goto Mount

A couple of years ago, when I was trying to take wide-field (nightscape) Astro-images with a DSLR camera on a simple photo tripod, I was surprised to discover there were star trails in even a 30-second nightscape image. And my lens FL was set at 20mm. To fix this frustrating problem, I needed a way to get my camera to track the sky.

So I attempted to construct a barn door tracker. I started down this path because I wanted something inexpensive, small, lightweight and easy to set up. This project proved to be difficult to finish as I could not find a 1 RPM synchronous motor. I gave up on the Barn Door tracker project and started using my large telescope mount (CPC 1100 on the HD Pro equatorial wedge) onto which I affixed my DSLR camera for tracked nightscape images. It became obvious very quickly that this setup was anything but inexpensive, small, lightweight and easy to set up.

So fast forward two years. I started seeing used Celestron SLT/GT goto mounts on sale on eBay and other places for less than $100. This price included the hand controller (HC), sometimes as low as $20 (minus the HC). Since I own a Celestron mount on an equatorial wedge, I realized that maybe this was the answer to get tracked nightscape images. So I did research on the SLT and GT mounts and found out it is fully capable of being put in equatorial (EQ) tracking mode. All that was left now was to get a wedge for this mount. I found several plans on the internet but none of them met my requirements for quick setup, ease-of-use, and expedited an accurate polar alignment. What follows are the construction materials, the build instructions, operating instructions and photographic results of this project.

My version of the Equatorial Wedge

This wedge was designed and constructed to be lightweight but could still carry at least a 5-pound payload. The SLT/GT mount can only handle 8 pounds so my goal was to keep everything on the mount at 4 pounds or less. As this project progressed, I realized that it would be the perfect entry-level setup for beginning AP. So with that in mind, I tried to keep this wedge construction as simple as possible and buildable in a single weekend. I wanted a setup that was easy to adjust to get an accurate polar alignment and would allow decent tracking with a DSLR camera using an intervalometer (and no computer for image capture). I also tried to keep the expense down, thinking that I could put a $<100 SLT/GT goto mount on a $30 wedge and it would produce some respectable results. As it turns out, I had several other necessary pieces in my "Astro" accessories that the beginner would not necessarily have. The additional items that a beginner would need for this project are:

1. A suitable tripod
2. A Celestron hand controller (if one didn’t come with the mount purchase)
3. A vixen style bar for attaching the camera to the mount
4. A small telescope (50 – 80mm) for the goto alignment and then to polar align the mount.

Construction materials:

Wood: (see figure 1)

• 6” x 6”, 1” thick pine board for the Tripod Disk,
• 6” x 21” piece of 5/16” plywood for the Base and Wedge Plates
• 2) 3” x 1 ½” 1” thick piece of pine for the Dowel Blocks
• 5 ¼” long piece of ¾” diameter pine dowel
• 2) 1” x 1” pine board squares to secure the cup hooks (not shown)
Wood Pieces.jpg
fig 1

Hardware: (see figure 2)

• 2) #10-32 1” long thumb screws
• 3) 5/16-18 clamping knobs (2 closed end and one open end)
• 5/16 – 18 Insert nut
• 5) Auto Trim panel plugs
• 6” continuous hinge (I cut a 12” hinge in half)
• 12” long, 5/16 – 18 threaded bar (7” for Altitude adjustment rod and 5” to connect the tripod, disk, and base plate together allowing for the Azimuth adjustment)
• Acorn cap nut 5/16 - 18
• 7/16 x 2 ½ x .047 and 7/16 x 1 ½” x .047 -- 11-pound capacity spring pack.
• 2) cup hooks
• 2) 3/16 x 1” fender washers
• 6” disk of HDPE (I cut mine from a 1-gallon ice cream bucket lid, shown later)
• 2) 2 ½” wood screws (not shown), 6) ¼” beefy machine screws for the wedge plate hinge, 6) 1” wood screws (4 for the dowel blocks and 2 for cup hook blocks)
Hardware Pieces.jpg
fig 2

Tools used:

• Drill press (hand drill attached to a portable press)
• Jigsaw
• Various drill bits (normal and spade bits)
• Drill sanding disk
• Screwdrivers
• Various wood screws
• Wood glue


Construction Steps:

Cut, shape and drill the wood pieces according to the dimensions on the pictures below. The hole in the dowel blocks is ¾” wide using a spade drill bit at the blocks’ center point. The hole in the dowel’s center is 13/32" for the insert nut. Once this hole is drilled, screw in the insert nut into the dowel. This is the stationary pivot point through which the Altitude adjustment rod passes. Next, drill an 11/32" hole 1¼” from the hinge line on the centerline of the base plate. This is the hole that connects the tripod disk to the base plate and allows for the Azimuth adjustments. Now, using a ½” spade drill bit, drill a ½” wide channel 1 ½” long starting 3 ¼” from the end of the base plate. This channel is where the Altitude adjustment rod passes through the base plate.
The holes for the Tripod Disk are going to be unique to whatever tripod you choose to use. They need to be countersunk so the base plate sits flush on top of the tripod disk.
Cut Wood Pieces.jpg

fig 3

Don’t forget to precisely measure and drill the 11/32" center hole for the 5” x 5/16” threaded Azimuth adjustment rod (very important step). Lastly, drill the holes for the auto trim panel plugs based on the ones you acquired. They act as a low friction point for the azimuth adjustments. So after this step, you should have a 6” round, 1” thick tripod disk, a 6” x 14” base plate, a 6” x 7” wedge plate, 2 - 3” x 1 ½” dowel blocks and a 5 ¼” long piece of ¾” dowel. All as pictured above.

To drill the holes in the wedge plate, first, remove the metal mounting plate from the bottom of the SLT/GT mount (this plate is only used for measuring and NOT for connecting the SLT/GT mount to the wedge plate). Find the center of the wedge plate (horizontal and vertical) and orient the SLT/GT metal plate along the vertical axis, mark all 3 holes. The two outer holes are for the 10-32 thumbscrews and a ¼” center hole acts as the resting spot for the acorn cap nut. Countersink this hole to conform to the shape of the Acorn nut.
Wedge Plate Holes.jpg
fig 4

After you have drilled the above 3 holes, attach the mount, using the thumbscrews and fender washers. Snug the thumb screws tight enough that the small plastic feet on the base of the SLT/GT mount make 3 indentations on the wedge plate. Now drill 3 holes 3/16” deep using a ¼” drill bit. These holes allow the SLT/GT mount to sit flush against the wedge plate and act a guide making it easier to attach the SLT mount to the wedge plate.

At this point, I spray painted all the wood pieces with ultra-flat black enamel paint. Each piece got 3 coats.
Tripod Disk.jpg
fig 5

Here is a close up of the Tripod Disk with all its holes and Auto trim panel plugs installed. 4 are shown, but a 5th one needs to be added in that big space. The HDPE disk will sit on top of the Tripod Disk.

Below is the HDPE (high-density polyurethane) disk I cut from an ice cream bucket lid. This disk sits between the tripod disk and the base plate and acts as a low friction point to allow for easier and more precise Azimuth adjustment when doing the Polar alignment.
HDPE Disk.jpg
HDPE Disk.jpg (28.62 KiB) Viewed 11074 times
fig 6

The Tripod Disk attached to the tripod. (see figure 7)
Tripod Disk On Tripod.jpg
fig 7

Assembling the pieces parts:

After the paint has thoroughly dried it’s time to assemble. There are two glue & screw operations. The first is to glue & screw the dowel blocks to the base plate as shown. Make sure to drill small pilot holes in the base plate and the blocks (2 screws per block). Don’t forget to insert the dowel between the two dowel block BEFORE you glue & screw. Also, make sure you get no glue on the dowel as it needs to move freely. Then glue & screw the 1” cup hook blocks to the top of the wedge plate flush with the top edge on the centerline of the wedge plate. Then glue & screw the second block 1” from the back edge of the base plate on the centerline of the base plate (1 wood screw per block).

When attaching the 6” hinge to the wedge plate and the base plate pay careful attention to the “squareness” of the hinge. I drew two guidelines for the hinge edge so I could tighten it down making sure it didn’t “wander”. Now cut your 12” 5/16-18 threaded bar into a 7” piece and a 5” piece. File the cut ends so that caps can be screwed onto it. Now thread the 7” bar (now called the Altitude adjustment rod) into and through the dowel’s insert nut. Once you have gotten about 2” through, screw on the Acorn cap nut and secure tightly. On the other end secure the closed-end clamping knob (I used a second nut to cinch up against the clamping know to lock it in place).
Completed Wedge.jpg
fig 8

Drill a small pilot hole for the cup hooks and screw them in place. Only attach the springs when the mount is in use. These springs put a lot of pressure on the cup hooks. It is also easier to attach the SLT/GT mount with the springs off.

Now insert the 5” Azimuth threaded bar (with a wide washer) up from the underside of the mount through the tripod disk, the HDPE disk, and then through the base plate. Put another wide washer over this threaded rod and then screw on the open end clamping knob. Snug this assembly down. Now you are ready to attach the SLT/GT mount onto the wedge plate. Have the thumbscrews, fender washers, and springs ready to go. Line up the SLT/GT mount “feet” with holes in the wedge plate and then screw in the thumbscrews with fender washers in place. Once the thumbscrews are tight, attach the springs starting with the base plate then attach to the wedge plate.

At this point, you are done. All that is left is to attach your camera or your small telescope to the vixen bar and clamp that in place on the SLT/GT mount. Next, you will have to guess or measure the angle of the wedge plate so it matches your latitude. If you look closely you’ll see I’ve attached a clear plastic protractor marked with degrees to the base plate such that the center of the protractor is lined up with the apex of the hinge (see fig 8).

When finished it should look something like this.
Complete Setup.jpg
fig 9
Complete Setup2.jpg
fig 10

The 70mm f/5.7 scope used for aligning the mount prior to attaching the DSLR to start imaging. (see figure 11)
Setup With Scope.jpg
fig 11

Operating Instructions:
I believe it is easier to align the mount using a small telescope than trying to use the camera and its live view feature. Make sure all mount connections are snug.

First orient the tripod so that the Altitude adjustment rod points to the North Star (Polaris). Next set the wedge plate to the proper angle to represent your latitude. As a general rule of thumb as you go higher in latitude the closer the SLT mount arm points to the zenith. Or the lower you go in latitude the closer the SLT mount arm points to the horizon.

After turning on the power to the mount you will need to give the HC all your local particulars. After that, you will select EQ North/South alignment (depending on which side of the equator you live). I prefer to do a 2-star “goto” alignment. After a successful 2-star “goto” alignment, slew to a star near the meridian and on or around the celestial equator for the following procedure. What follows is the all star polar alignment (ASPA). Then press the align button on the hand controller and select “Polar Align” then “Align Mount”. After you have synced up the star the mount will move to where it thinks the star should be if you were perfectly pointed at the north celestial pole (NCP). Here is where the adjustment knobs on the base plate come into play. Use the Altitude adjustment knob to center the star on that axis then loosen the base plate to tripod base knob to move the base in Azimuth to center the star on that axis. Once you have centered the star in Azimuth, tighten the knob back down so the plate will not move.

After these steps are complete you will need to re-align the mount. Once you get good at these procedures you can get this done in a matter of minutes. In fact, I usually do it twice to make sure I’m as close to the NCP as I can reasonably get.

After the mount is “goto” aligned and polar aligned you can replace the telescope with your DSLR camera and start imaging away.
Here is an example of the first set of images from this setup. As stated, I used this setup with my DSLR camera (a Canon T1i) and an intervalometer and nothing else to acquire the images. A computer was not used until the stacking and post-processing phase of AP.

Results:
Here are some of the very first images I acquired using this setup at my dark site on July 6, 2016. These images were taken with just the Canon T1i, my 18-55mm kit lens or the 50-250mm kit telephoto lens, and using just an intervalometer for acquiring multiple images.

This is a single unprocessed image of the Sagittarius region of the Milky Way. Lens at 25mm, 64 seconds, ISO 6400.
Sagittarius Milky Way Single 25mm Unprocessed.jpg
This is the same image cropped with minimal levels and curves stretching in PhotoShop.
Sagittarius Milky Way Single 25mm 64 sec ISO 6400 proc.jpg
This image of the same region used the lens at 25mm and is a stacked 15 x 4 minutes at ISO 1600 for a total of 1 hour of exposure time. It was stacked in Deep Sky Stacker 3.3.4 (DSS) and has been fully post-processed in PhotoShop.
Sagittarius Milky Way Wide Field 25mm 15x4min ISO 1600 Stacked and Processed Small.jpg
This image of M31 was taken with great haste as I was running out of night time. It uses my 50-250mm telephoto lens at 200mm. It is a DSS stacked image, each image used different exposure times (from 30 seconds to 2 minutes) but it adds up to 13 minutes of exposure at ISO 12800! It was fully post-processed in PhotoShop.
M31 200mm 13min ISO 12800 Small.jpg
Here are some follow-up shots accomplished a few weeks later to further test out this setup.

M27 the Dumbbell. 10 30 second exposures for 5 minutes total, ISO 800 (from my red/orange backyard). 50-250mm lens at 130mm
M27 200mm 10x30 Seconds ISO 1600.jpg
M3 Glob. 10 3 minute exposures for 30 minutes total, ISO 800. 50-250mm lens at 100mm
M3 Stacked Proc V2 Cropped.jpg
M104 the Sombrero Galaxy. 10 3 minute exposures for 30 minutes total. 50-250mm lens at 100mm
M104 Stacked Proc V1 Cropped.jpg
In Conclusion:
Well, there you have it. An inexpensive wedge for an inexpensive goto mount dedicated to your DSLR camera and lens for wide-field and long exposure AP imaging on a budget! Feel free to print out this post to use in your workshop should you feel the need to build this accessory.

Cheers,
JT
∞ Scopes: Celestron CPC1100 #2 Scope: 8" f/7.5 Dob AP Scopes: TPO 6" f/9 RC, ES 80mm f/6 APO G&G Scopes: Meade 102mm f/7.8, Bresser 102mm f/4.5 Guide Scopes: 70 & 80mm fracs
∞ Mounts: iOptron CEM60, Celestron AVX, SLT & GT (Alt-Az), Meade DS2000
∞ Cameras: Canon T3i (x2), ZWO ASI294MC Pro & 120MC, Orion SSAG
∞ Binos: 10X50,10.5X70,15X70², 25X100
∞ EPs: ES: 21 100°, 30 82° X-Cels: 9, 12, 18, 25 GSO:15,20
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I never met a scope I didn't want to keep. "My God, it's full of stars." Searching the skies since 1966!
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Re: Celestron SLT/GT Wedge For Budget Wide Field AP

#2

Post by Baskevo »

Wow! This is awesome, JT, and sounds like an awesome project! I would love to try this some day. Thanks for sharing.
-James W.

Telescope: Explore Scientific 80mm FCD100 Triplet APO Refractor
Mount: EQ6-R Pro
Cameras: ZWO ASI1600mm Pro (Cooled) | Canon DSLR EOS T7i
Auto-guiding: ZWO ASI120mm-Mini + Astromania 50mm Guidescope

Filters: ZWO 31mm Ha/Oiii/Sii 7nm + LRGB | Orion 2" Skyglow Filter
Accessories: Explore Scientific 2" Field Flattener, ZWO EFW 8 Position
Software: APT, SharpCap Pro, PHD2, CPWI | PixInsight, DeepSkyStacker, Photoshop

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Re: Celestron SLT/GT Wedge For Budget Wide Field AP

#3

Post by Juno16 »

Beautiful construction work JT!

That is really an impressive piece of hardware and your results are fabulous.

Very useful post! I might give this a shot to make a wide-field rig for my dslr when I go camping.

Thanks!

Jim
Jim

Scopes: Explore Scientific ED102 Triplet APO, Celestron Nexstar 130 SLT.
Mounts: Celestron AVX with Orion MM Autoguider, SLT;
Binoculars: Bushnell 10X50
Stuff: ASI EAF Focus Motor, Stellarview FF/FR
Camera / Software: ASI 533 mc pro, IDAS LPS D-1, Optolong L-Enhance, Astrophotography Tool, PHD2, SharpCap Pro, Adobe Photoshop CC, Pixinsight.
Dog: Jack
Sky: Bortle 7-8
Astro Photos https://flickr.com/photos/157183480@N07 ... 7681236785
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Re: Celestron SLT/GT Wedge For Budget Wide Field AP

#4

Post by fatboy1271 »

I'm not sure whether to be happy or sad about this... I was trying to do something similar about 4 years ago, but didn't put this much thought into it :|

Anyway, had I seen this back then I probably wouldn't have my AVX. Now I have to dig out my 90SLT mount and see if I destroyed it. It was inoperable when I purchased my AVX, that really was a good excuse to spend the money, but if I can get it working then I need to do this!!!

Thanks JT!
OTAs: Explore Scientific ED80 Essential Edition / The Little Guy (Celestron 90SLT)
Mount: Celestron Advanced VX
Gear: Canon 70D / Hutech LPS-D1-48 / ES 2" Field Flattener / QHY PoleMaster / Celestron GPS / ZWO ASI120MC / Orion 50mm Guide Scope / ZWO EAF
Software: CPWI / PHD2 / N.I.N.A / Stellarium/StellariumScope/Remote Control / PI / RegiStax 6 / AutoStakkert!2 / PIPP | Retired? BackyardEOS Premium
EPs: Stock Celestron 9mm and 24mm / Celestron Omni 32mm (I love this one!) / Celestron X-Cel LX 3x Barlow (I think 2X would have been smarter...)
Support Staff (Loved Ones!): CeCe, Ro, and Geno
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Re: Celestron SLT/GT Wedge For Budget Wide Field AP

#5

Post by JayTee »

fatboy1271 wrote: Sun Sep 15, 2019 3:44 am I'm not sure whether to be happy or sad about this... I was trying to do something similar about 4 years ago, but didn't put this much thought into it :|

Anyway, had I seen this back then I probably wouldn't have my AVX. Now I have to dig out my 90SLT mount and see if I destroyed it. It was inoperable when I purchased my AVX, that really was a good excuse to spend the money, but if I can get it working then I need to do this!!!

Thanks JT!
Because dark site time is so precious to me I take this setup out with me even when I'm using my AVX. This was the reason I have two DSLRs. One is attached to this mount+wedge, the other is plugged into either my ES 80mm or the 6" RC on the AVX while I spend my time (because everything else is automated) looking through either the CPC1100 or the 8" dob. My wife thinks I overpack for my trips but there's lots to observe and capture when you are out at a Bortle 1 or 2 location.

Cheers,
JT
∞ Scopes: Celestron CPC1100 #2 Scope: 8" f/7.5 Dob AP Scopes: TPO 6" f/9 RC, ES 80mm f/6 APO G&G Scopes: Meade 102mm f/7.8, Bresser 102mm f/4.5 Guide Scopes: 70 & 80mm fracs
∞ Mounts: iOptron CEM60, Celestron AVX, SLT & GT (Alt-Az), Meade DS2000
∞ Cameras: Canon T3i (x2), ZWO ASI294MC Pro & 120MC, Orion SSAG
∞ Binos: 10X50,10.5X70,15X70², 25X100
∞ EPs: ES: 21 100°, 30 82° X-Cels: 9, 12, 18, 25 GSO:15,20
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I never met a scope I didn't want to keep. "My God, it's full of stars." Searching the skies since 1966!
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Re: Celestron SLT/GT Wedge For Budget Wide Field AP

#6

Post by fatboy1271 »

Pffft…. Bortle 1 or 2...? What's that?! Yeah, I'd take everything I could too if that's where I was headed :)

If my SLT motor is shot because I messed with it I'm going to check ebay. I can use the 450D for this and keep using the 70D for my main imaging rig on the AVX!!!
OTAs: Explore Scientific ED80 Essential Edition / The Little Guy (Celestron 90SLT)
Mount: Celestron Advanced VX
Gear: Canon 70D / Hutech LPS-D1-48 / ES 2" Field Flattener / QHY PoleMaster / Celestron GPS / ZWO ASI120MC / Orion 50mm Guide Scope / ZWO EAF
Software: CPWI / PHD2 / N.I.N.A / Stellarium/StellariumScope/Remote Control / PI / RegiStax 6 / AutoStakkert!2 / PIPP | Retired? BackyardEOS Premium
EPs: Stock Celestron 9mm and 24mm / Celestron Omni 32mm (I love this one!) / Celestron X-Cel LX 3x Barlow (I think 2X would have been smarter...)
Support Staff (Loved Ones!): CeCe, Ro, and Geno
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Re: Celestron SLT/GT Wedge For Budget Wide Field AP

#7

Post by JayTee »

fatboy1271 wrote: Sun Sep 15, 2019 4:17 am Pffft…. Bortle 1 or 2...? What's that?! Yeah, I'd take everything I could too if that's where I was headed :)

If my SLT motor is shot because I messed with it I'm going to check eBay. I can use the 450D for this and keep using the 70D for my main imaging rig on the AVX!!!
That's a perfect use for the 450D. There are 3 lenses at my disposal for this setup, the 18-55mm kit lens, my nifty fifty (50mm), and my 75-300mm telephoto. These 3 lenses pretty much cover all the bases.

Cheers,
JT
∞ Scopes: Celestron CPC1100 #2 Scope: 8" f/7.5 Dob AP Scopes: TPO 6" f/9 RC, ES 80mm f/6 APO G&G Scopes: Meade 102mm f/7.8, Bresser 102mm f/4.5 Guide Scopes: 70 & 80mm fracs
∞ Mounts: iOptron CEM60, Celestron AVX, SLT & GT (Alt-Az), Meade DS2000
∞ Cameras: Canon T3i (x2), ZWO ASI294MC Pro & 120MC, Orion SSAG
∞ Binos: 10X50,10.5X70,15X70², 25X100
∞ EPs: ES: 21 100°, 30 82° X-Cels: 9, 12, 18, 25 GSO:15,20
Home Wx (click)

I never met a scope I didn't want to keep. "My God, it's full of stars." Searching the skies since 1966!
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Re: Celestron SLT/GT Wedge For Budget Wide Field AP

#8

Post by Kanadalainen »

Thank you JT, this is an incredibly nice write up.

Ian
Ian

Scopes

Stellarvue 70T f6 - triplet :sprefac:
"Mark Mk. II" -60 mm Tasco guider
C80 frac with 2" focuser, f11.4 - long doublet
"Frosty m. II" - the 14.5" strut dob f4.5 with a ZOC optic, US digital encoders, Nexus II wifi + Moonlite focuser


Mounts - Ioptron Skyguider pro, SW NEQ6 pro

Cameras, lenses - ASI2600mc pro (on order), ASI290mm mini, Canon 60D modded for UV/IR cut (09/2020)- Rokinon 10mm 2.8, Rokinon 135mm f2

Software - Photoshop and Lightroom 2020, GIMP, Skysafari 6 Pro, Astro Pixel Processor - using Mac tablet and ASIair pro to run the AP rig.

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Re: Celestron SLT/GT Wedge For Budget Wide Field AP

#9

Post by STEVE333 »

Nice article and nice workmanship. You are a clever guy. Thanks for sharing.

Steve
Steve King: Light Pollution (Bortle 5)
Telescope + Mount + Guiding: W.O. Star71-ii or ES ED102 CF + iOptron CEM40 EC + Orion Magnificent Mini AutoGuider
Camera: ASI 1600MM Pro + EFW Filter Wheel + Chroma 3nm Siii, Ha, Oiii + ZWO LRGB Filters
Software: PHD2; APT; PixInsight **** My AP website: www.steveking.pictures ****

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Re: Celestron SLT/GT Wedge For Budget Wide Field AP

#10

Post by Greenman »

Fantastic work at all levels JT. Inspired stuff.
Cheers,

Tony.

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AP SCT: Celestron NexStar 6SE; Orion RACI 9x500 illuminated finder; Antares 0.63 reducer; Antares 2" Dielectic diagonal.

AP Refractor: Altair Starwave 80ED F7; 1x PlanoStar Flattener; Altair Starwave 0.8 FF/FR; Antares Versascope 60mm finder.

Celestron AVX Mount; Celestron SE6 Mount; Sky portal 2 WiFi; ZWO ASI224MC; SvBony 305; Canon EOS 100 (Unmoded).
X-cel LX eyepieces & Barlows 2x 3x, Celestron 8-24mm Zoom.

Filters: Astronomik IR cut; Baader Semi Apo; Baader Fringe Killer.

Binoculars: Celestron 15 x 70.

Latitude: 52.219853
Longitude: -1.034471
Accuracy: 5 m
Bortle 4 site. https://maps.google.com/?q=52.21985,-1.03447

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