Vary Your Barlows Power
- Jones
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Vary Your Barlows Power
Using the micro guide eyepiece, the center linear scale, found 2 stars near Mars that were fairly bright, 7-8 magnitude, that were 20 units apart. Insert the barlow and the stars are now 34 units separation. Divide 20 into 34 and you get 1.7x actual for the Nikon barlow.
I was doing this to get higher power on a zoom eyepiece. Wanted the highest power to be 2.8mm focal length. So will get this with the .5" ext. ring on the eyepiece using the Nikon barlow.
You can get a micro guide eyepiece direct from China on ebay for $29.95. Search 12mm telescope eyepiece to find ad.
Agena Astro has the filter threaded 1.25" ext. tubes under their brand Blue Fireball. Fit and finish are really nice.
Triple lensed fracs are so yummy when looking at planets.
- Makuser
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Re: Vary Your Barlows Power
Sky-Watcher 90mm f/13.8 Maksutov-Cassegrain on motorized Multimount
Orion Astroview 120ST f/5 Refractor on EQ3 mount
Celestron Comet Catcher 140mm f/3.64 Schmidt-Newtonian on alt-az mount
Celestron Omni XLT150R f/5 Refractor on CG4 mount with dual axis drives.
Orion 180mm f/15 Maksutov-Cassegrain on CG5-GT Goto mount.
Orion XT12i 12" f/4.9 Dobsonian Intelliscope.
Kamakura 7x35 Binoculars and Celestron SkyMaster 15x70 Binoculars. ZWO ASI 120MC camera.
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- Lady Fraktor
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Re: Vary Your Barlows Power
There is a 1.8x 1.25" but expect to pay 375€ or more for it on the used market if you can find one. (TMB)
There is also the Kson 1.8x 1.25" which is a general use quality barlow
https://ensoptical.co.uk/index.php?rout ... ct_id=2723
See Far Sticks: Elita 103/1575, AOM FLT 105/1000, Bresser 127/1200 BV, Nočný stopár 152/1200, Vyrobené doma 70/700, Stellarvue NHNG DX 80/552, TAL RS 100/1000, Vixen SD115s/885
EQ: TAL MT-1, Vixen SXP, SXP2, AXJ, AXD
Az/Alt: AYO Digi II, Stellarvue M2C, Argo Navis encoders on both
Tripods: Berlebach Planet (2), Uni 28 Astro, Report 372, TAL factory maple, Vixen ASG-CB90, Vixen AXD-TR102
Diagonals: Astro-Physics, Baader Amici, Baader Herschel, iStar Blue, Stellarvue DX, Tak prism, TAL, Vixen
Eyepieces: Antares to Zeiss (1000101)
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- Bigzmey
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Re: Vary Your Barlows Power
Mounts: SW: SkyTee2, AzGTi; iOptron: AZMP; ES: Twilight I; Bresser: EXOS2; UA: MicroStar.
Binos: APM: 100-90 APO; Canon: IS 15x50; Orion: Binoviewer, LG II 15x70, WV 10x50, Nikon: AE 16x50, 10x50, 8x40.
EPs: Pentax: XWs & XFs; TeleVue: Delites, Delos, Panoptic & Plossls; ES: 68, 62; Vixen: SLVs; Baader: BCOs, Aspherics, Mark IV.
Diagonals: Baader: BBHS mirror, Zeiss Spec T2 prism, Clicklock dielectric; TeleVue: Evebrite dielectric; AltairAstro: 2" prism.
Filters: Lumicon: DeepSky, UHC, OIII, H-beta; Baader: Moon & SkyGlow, Contrast Booster, UHC-S, 6-color set; Astronomik: UHC.
Solar: HA: Lunt 50mm single stack, W/L: Meade Herschel wedge.
Observing: DSOs: 3106 (Completed: Messier, Herschel 1, 2, 3. In progress: H2,500: 2180, S110: 77). Doubles: 2461, Comets: 34, Asteroids: 261
- Ruud
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Re: Vary Your Barlows Power
I've stopped buying Barlows.
The 1.8x is a rather long Barlow. I would really like it if it were worth €375! For that money I would gladly part with it!
- Lady Fraktor
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Re: Vary Your Barlows Power
I am not sure how hard they are to locate on the used market.
For a mild power increase with a 2" size, the Antares 1.6x is an excellent one.
If looking for one get the version without the twist lock though. The twist lock changes the parameters a bit and it is noticeable in use.
See Far Sticks: Elita 103/1575, AOM FLT 105/1000, Bresser 127/1200 BV, Nočný stopár 152/1200, Vyrobené doma 70/700, Stellarvue NHNG DX 80/552, TAL RS 100/1000, Vixen SD115s/885
EQ: TAL MT-1, Vixen SXP, SXP2, AXJ, AXD
Az/Alt: AYO Digi II, Stellarvue M2C, Argo Navis encoders on both
Tripods: Berlebach Planet (2), Uni 28 Astro, Report 372, TAL factory maple, Vixen ASG-CB90, Vixen AXD-TR102
Diagonals: Astro-Physics, Baader Amici, Baader Herschel, iStar Blue, Stellarvue DX, Tak prism, TAL, Vixen
Eyepieces: Antares to Zeiss (1000101)
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- kt4hx
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Re: Vary Your Barlows Power
Scopes: Astro Sky 17.5 f/4.5 Dob || Apertura AD12 f/5 Dob || Zhumell Z10 f/4.9 Dob ||
ES AR127 f/6.5 || ES ED80 f/6 || Apertura 6" f/5 Newtonian
Mounts: ES Twilight-II and Twilight-I
EPs: AT 82° 28mm UWA || TV Ethos 100° 21mm and 13mm || Vixen LVW 65° 22mm ||
ES 82° 18mm || Pentax XW 70° 10mm, 7mm and 5mm || barlows
Filters (2 inch): DGM NPB || Orion Ultra Block, O-III and Sky Glow || Baader HaB
Primary Field Atlases: Uranometria All-Sky Edition and Interstellarum Deep Sky Atlas
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"Astronomers, we look into the past to see our future." (me)
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- Jones
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Re: Vary Your Barlows Power
32÷ 12= 2.66x. Want to get 3x from the Barlow to get planetary powers from the zoom. A 10mm t2 ring gives barely more at 2.8x.
Put in a 30mm ring and got 3.16x a little too much..
Stacked up rings for 25mm and got right where I wanted at 3.0x.
You can get an assortment of rings direct from China on ebay. They have lots of t2 accessories to choose.
Triple lensed fracs are so yummy when looking at planets.
- helicon Online
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Re: Vary Your Barlows Power
Refractors: ES AR152 f/6.5 Achromat on Twilight II, Celestron 102mm XLT f/9.8 on Celestron Heavy Duty Alt Az mount, KOWA 90mm spotting scope
Binoculars: Celestron SkyMaster 15x70, Bushnell 10x50
Eyepieces: Various, GSO Superview, 9mm Plossl, Celestron 25mm Plossl
Camera: ZWO ASI 120
Naked Eye: Two Eyeballs
Latitude: 48.7229° N
- Jones
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Re: Vary Your Barlows Power
Triple lensed fracs are so yummy when looking at planets.
- Lady Fraktor
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Re: Vary Your Barlows Power
It rarely works out to be 1x in front of a diagonal.
See Far Sticks: Elita 103/1575, AOM FLT 105/1000, Bresser 127/1200 BV, Nočný stopár 152/1200, Vyrobené doma 70/700, Stellarvue NHNG DX 80/552, TAL RS 100/1000, Vixen SD115s/885
EQ: TAL MT-1, Vixen SXP, SXP2, AXJ, AXD
Az/Alt: AYO Digi II, Stellarvue M2C, Argo Navis encoders on both
Tripods: Berlebach Planet (2), Uni 28 Astro, Report 372, TAL factory maple, Vixen ASG-CB90, Vixen AXD-TR102
Diagonals: Astro-Physics, Baader Amici, Baader Herschel, iStar Blue, Stellarvue DX, Tak prism, TAL, Vixen
Eyepieces: Antares to Zeiss (1000101)
The only culture I have is from yogurt
- Jones
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Re: Vary Your Barlows Power
Put barlow in front of diagonal 15 units apart 15÷6=2.5x using the micro guide eyepiece 12mm.
Triple lensed fracs are so yummy when looking at planets.
- Lady Fraktor
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Re: Vary Your Barlows Power
Here is the formula to solve: 1+(D/
To get those numbers we reverse the equation:
D/(M-1)=
D – Distance from top of barlow housing (shoulder) to center of elements
M – Barlow Magnification
So my Antares 2x barlow is 68mm or: 68/ (2-1)= 68
Because it is going in front of the diagonal you must now include the lightpath length of the diagonal.
In my case it is 112mm:
112+68= 180
Now we use the first equation 1+ (D/
See Far Sticks: Elita 103/1575, AOM FLT 105/1000, Bresser 127/1200 BV, Nočný stopár 152/1200, Vyrobené doma 70/700, Stellarvue NHNG DX 80/552, TAL RS 100/1000, Vixen SD115s/885
EQ: TAL MT-1, Vixen SXP, SXP2, AXJ, AXD
Az/Alt: AYO Digi II, Stellarvue M2C, Argo Navis encoders on both
Tripods: Berlebach Planet (2), Uni 28 Astro, Report 372, TAL factory maple, Vixen ASG-CB90, Vixen AXD-TR102
Diagonals: Astro-Physics, Baader Amici, Baader Herschel, iStar Blue, Stellarvue DX, Tak prism, TAL, Vixen
Eyepieces: Antares to Zeiss (1000101)
The only culture I have is from yogurt
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