Apertura Wide Angle Eyepiece Kit for SCTs

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Bigzmey United States of America
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Apertura Wide Angle Eyepiece Kit for SCTs

#1

Post by Bigzmey »


Got a flyer from HPS advertising their new Apertura Wide Angle Eyepiece Kit for SCTs.

https://www.highpointscientific.com/ape ... id=5XGajvb

Generally, I am not big fan of kits, you almost always end up with stuff you don't need. In this kit however the EP focal length range matches well SCT F10 scopes and diagonal seems to be of descent quality. Not sure about the EPs. The body look different but number of elements, FOV, eye relief and focal lengths match SWA design offered by several vendors.

https://agenaastro.com/agena-32mm-super ... piece.html
https://agenaastro.com/agena-1-25-super ... e-set.html

They are not bad in slower scopes as entry level EP go, but if that's the case then HPS kit is a bit overpriced.
Scopes: Stellarvue: SV102ED; Celestron: 9.25" EdgeHD, 8" SCT, 150ST, Onyx 80ED; iOptron: Hankmeister 6" Mak; SW: 7" Mak; Meade: 80ST.
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, 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.

Observing: DSOs: 3106 (Completed: Messier, Herschel 1, 2, 3. In progress: H2,500: 2180, S110: 77). Doubles: 2382, Comets: 34, Asteroids: 255
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Re: Apertura Wide Angle Eyepiece Kit for SCTs

#2

Post by SpyderwerX »


So I'm assuming these are all the standard 5 element Erfle design? I would say a little overpriced also. :)
~Frankie~ My mind: Always on...Slightly off. :?
Celestron CPC1100 SCT....Celestron Evolution 8 SCT...TeleVue-85 apo...SkyWatcher ST150 achro..ST102 achro..ST80 achro.
Celestron AVX...Orion Atlas EQ-G...SkyTee-2...Twilight-1.
Baader BBHS prism and mirror diagonals + Vernonscope quartz 1.25"
EPs: TeleVue oldie (NJ) & modern Plossls, Widefields, and Naglers + 3-6 zoom & Brandons 6-32.
Astronomik, Lumicon & Baader filters..
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Re: Apertura Wide Angle Eyepiece Kit for SCTs

#3

Post by Ylem »


Meh, I don't need anymore 1.25 EPs.

I would like the diagonal and maybe 2 or 3 2" EPs.
Then I might be interested.
Clear Skies,
-Jeff :telescopewink:


Member; ASTRA-NJ



Orion 80ED
Celestron C5, 6SE, Celestar 8
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Re: Apertura Wide Angle Eyepiece Kit for SCTs

#4

Post by Bigzmey »


SpyderwerX wrote: Thu Jul 15, 2021 9:00 pm So I'm assuming these are all the standard 5 element Erfle design? I would say a little overpriced also. :)
Available info does suggest that they are of Erfle design.
Scopes: Stellarvue: SV102ED; Celestron: 9.25" EdgeHD, 8" SCT, 150ST, Onyx 80ED; iOptron: Hankmeister 6" Mak; SW: 7" Mak; Meade: 80ST.
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, 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.

Observing: DSOs: 3106 (Completed: Messier, Herschel 1, 2, 3. In progress: H2,500: 2180, S110: 77). Doubles: 2382, Comets: 34, Asteroids: 255
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Re: Apertura Wide Angle Eyepiece Kit for SCTs

#5

Post by Bigzmey »


Ylem wrote: Thu Jul 15, 2021 9:25 pm Meh, I don't need anymore 1.25 EPs.

I would like the diagonal and maybe 2 or 3 2" EPs.
Then I might be interested.
The good thing about SCTs is that even simple EPs perform nicely. I had good experience with 2" Q70/SWA and Antares Erfle.
Scopes: Stellarvue: SV102ED; Celestron: 9.25" EdgeHD, 8" SCT, 150ST, Onyx 80ED; iOptron: Hankmeister 6" Mak; SW: 7" Mak; Meade: 80ST.
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, 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.

Observing: DSOs: 3106 (Completed: Messier, Herschel 1, 2, 3. In progress: H2,500: 2180, S110: 77). Doubles: 2382, Comets: 34, Asteroids: 255
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Re: Apertura Wide Angle Eyepiece Kit for SCTs

#6

Post by Ylem »


Bigzmey wrote: Thu Jul 15, 2021 10:16 pm
Ylem wrote: Thu Jul 15, 2021 9:25 pm Meh, I don't need anymore 1.25 EPs.

I would like the diagonal and maybe 2 or 3 2" EPs.
Then I might be interested.
The good thing about SCTs is that even simple EPs perform nicely. I had good experience with 2" Q70/SWA and Antares Erfle.
I no longer have any 2" EPs, nor a diagonal.
I have been using the FR/C instead.
But as usual, new stuff always catches my eye :)
Clear Skies,
-Jeff :telescopewink:


Member; ASTRA-NJ



Orion 80ED
Celestron C5, 6SE, Celestar 8
Vixen Porta Mount ll
Coronado PST
A big box of Plossls
Little box of filters
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Re: Apertura Wide Angle Eyepiece Kit for SCTs

#7

Post by Bigzmey »


Ylem wrote: Thu Jul 15, 2021 10:47 pm
Bigzmey wrote: Thu Jul 15, 2021 10:16 pm
Ylem wrote: Thu Jul 15, 2021 9:25 pm Meh, I don't need anymore 1.25 EPs.

I would like the diagonal and maybe 2 or 3 2" EPs.
Then I might be interested.
The good thing about SCTs is that even simple EPs perform nicely. I had good experience with 2" Q70/SWA and Antares Erfle.
I no longer have any 2" EPs, nor a diagonal.
I have been using the FR/C instead.
But as usual, new stuff always catches my eye :)
Most of my sessions runs on 1.25" EPs only, but once in a while when I want to look at Pleiades or Ptolemy Cluster 2" EPs come handy.
Scopes: Stellarvue: SV102ED; Celestron: 9.25" EdgeHD, 8" SCT, 150ST, Onyx 80ED; iOptron: Hankmeister 6" Mak; SW: 7" Mak; Meade: 80ST.
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, 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.

Observing: DSOs: 3106 (Completed: Messier, Herschel 1, 2, 3. In progress: H2,500: 2180, S110: 77). Doubles: 2382, Comets: 34, Asteroids: 255
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Re: Apertura Wide Angle Eyepiece Kit for SCTs

#8

Post by SpyderwerX »


Bigzmey wrote: Thu Jul 15, 2021 11:14 pm
Ylem wrote: Thu Jul 15, 2021 10:47 pm
Bigzmey wrote: Thu Jul 15, 2021 10:16 pm

The good thing about SCTs is that even simple EPs perform nicely. I had good experience with 2" Q70/SWA and Antares Erfle.
I no longer have any 2" EPs, nor a diagonal.
I have been using the FR/C instead.
But as usual, new stuff always catches my eye :)
Most of my sessions runs on 1.25" EPs only, but once in a while when I want to look at Pleiades or Ptolemy Cluster 2" EPs come handy.

Amongst all of my "in-use" EP collection in the case, I only have 2 2" EPs. :)
~Frankie~ My mind: Always on...Slightly off. :?
Celestron CPC1100 SCT....Celestron Evolution 8 SCT...TeleVue-85 apo...SkyWatcher ST150 achro..ST102 achro..ST80 achro.
Celestron AVX...Orion Atlas EQ-G...SkyTee-2...Twilight-1.
Baader BBHS prism and mirror diagonals + Vernonscope quartz 1.25"
EPs: TeleVue oldie (NJ) & modern Plossls, Widefields, and Naglers + 3-6 zoom & Brandons 6-32.
Astronomik, Lumicon & Baader filters..
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Re: Apertura Wide Angle Eyepiece Kit for SCTs

#9

Post by Bigzmey »


SpyderwerX wrote: Thu Jul 15, 2021 11:32 pm
Bigzmey wrote: Thu Jul 15, 2021 11:14 pm
Ylem wrote: Thu Jul 15, 2021 10:47 pm

I no longer have any 2" EPs, nor a diagonal.
I have been using the FR/C instead.
But as usual, new stuff always catches my eye :)
Most of my sessions runs on 1.25" EPs only, but once in a while when I want to look at Pleiades or Ptolemy Cluster 2" EPs come handy.

Amongst all of my "in-use" EP collection in the case, I only have 2 2" EPs. :)
If your scope accommodates 2" EPs, then to achieve the maximum TFV of the scope one needs at least one 2" EP with maxed TFV. Whether one need more depends on the observing preferences. My favorite FOV for DSOs is ~70 deg, to keep it through the set I need to transition to 2" format around 25mm. I also like to keep my EPs 1.3-1.4x apart, so stepping from 1.25" XW20 to 2" Panoptic 27mm and then 36mm Baader Aspherics works very nicely. TV Plossl 55mm is somewhat redundant, since it has about the same TFV as Baader 36mm, but I just love super flat field with clean sharp stars it delivers. It also works nicely with narrow band filters for large nebulae.
Scopes: Stellarvue: SV102ED; Celestron: 9.25" EdgeHD, 8" SCT, 150ST, Onyx 80ED; iOptron: Hankmeister 6" Mak; SW: 7" Mak; Meade: 80ST.
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, 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.

Observing: DSOs: 3106 (Completed: Messier, Herschel 1, 2, 3. In progress: H2,500: 2180, S110: 77). Doubles: 2382, Comets: 34, Asteroids: 255
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Re: Apertura Wide Angle Eyepiece Kit for SCTs

#10

Post by SpyderwerX »


I currently only run a Nagler 20mm T5 (82*) and a Panoptic 27mm (68*). Most of my viewing is done with either the 11" or 8" SCT, and these pretty much push the TFOV limit. I can also employ the 6.3 focal reducer, so that makes the entire EP collection even more versatile.

In all honesty, my aim is to keep the EP collection on the lighter weight side, while still giving me a full range of FOV and magnification (exit pupil) flexibility. :)
~Frankie~ My mind: Always on...Slightly off. :?
Celestron CPC1100 SCT....Celestron Evolution 8 SCT...TeleVue-85 apo...SkyWatcher ST150 achro..ST102 achro..ST80 achro.
Celestron AVX...Orion Atlas EQ-G...SkyTee-2...Twilight-1.
Baader BBHS prism and mirror diagonals + Vernonscope quartz 1.25"
EPs: TeleVue oldie (NJ) & modern Plossls, Widefields, and Naglers + 3-6 zoom & Brandons 6-32.
Astronomik, Lumicon & Baader filters..
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Re: Apertura Wide Angle Eyepiece Kit for SCTs

#11

Post by Don Pensack »


If you take a hypothetical telescope with a 1200mm focal length and an f/5 ratio, if you develop a set of eyepieces 1.3-1.4x apart, or use exit pupil considerations to decide what your eyepieces will be,
you will have too many low power eyepieces with magnifications too close together and have high power eyepieces be too far apart.

I'll explain.
Let's start with 50x and make the magnifications 1.35x apart:
50x, 68x, 91x, 123x, 166x, 224x, 303x, 409x.
As you can see, the difference in magnification is too small to make a difference at the low power end and has huge jumps at the upper end.
The % changes are the same, but it results in too many low power eyepieces and high magnifications too far apart.
What if you made the set with a decreasing % change as magnifications went up to keep the changes visible, but able to "creep up" on the maximum magnification the seeing allows?
For example:
50x, 100x, 150x, 200x, 250x, 300x etc.
It would be unlikely you would look for an eyepiece in between magnifications, the difference in magnification would be noticeable from eyepiece to eyepiece, and the set makes more sense at the high end where you bump into seeing limits.

With that hypothetical telescope, the focal lengths of eyepieces would then be 24mm, 12mm, 8mm, 6mm, 4.8mm, 4mm
If you looked at the exit pupil produced, the jumps would be 4.8mm, 2.4mm, 1.6mm, 1.2mm, 1mm, 0.8mm
I can see that if you look at it from the standpoint of exit pupil, the jumps seem too large at first, and then too small toward the highest powers.
But I don't think that is a deficiency of the constant magnification jump idea, but a deficiency of using exit pupil to decide an eyepiece set.

One other way to create a set that recognizes the real world conditions in the field is to take your most-used eyepiece in the scope and to make the up and down changes from that eyepiece be closer together
and then expand the changes as you move away from that. That way your next higher and lower magnifications are close enough to still be in the "most-used" category and the ones at the extremes can be farther apart for when
you want a big change.
If we look at the hypothetical scope again, let's say 150x is the most-used magnification because it's a good match between sufficient magnification without being too dark.
Magnifications on either side could be 120x and 180x, then 80x and 220x, followed by 30x and 270x.
That would be focal lengths of 40mm, 15mm, 10mm, 8mm, 6.7mm, 5.5mm, 4.4mm
Aside from the 40mm not being a useful eyepiece at f/5 (a 30mm would be better), this could work if one spent most observing time in the middle. There are 3 magnifications from 100-200x, for instance.
The main problem is that manufacturers don't make eyepieces for that type of protocol.
Pentax XW eyepieces, for instance, are spaced (in the 1.25" size) 40% apart.

So that makes the constant magnification jump quite practical for scopes. And, the jump chosen could relate to the aperture. On a 20" scope, for example, having the jumps be 100x apart could be quite practical unless seeing conditions prevented it.
If magnifications over 300x weren't allowed by the atmosphere, that would be only a 3 eyepiece set.

The key point, here, is that there is more than one way to pick an eyepiece set, but having a constant % jump between eyepieces always results in having the magnifications too close together at low powers
and too far apart at high powers. So look at the kit. Does it contain useful magnifications, or are they bunched too close together? If the magnifications produced don't match your scope or your observing pattern, pass.
Astronomer since 1963
Currently using a 12.5" dob and a 4" apo refractor
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Re: Apertura Wide Angle Eyepiece Kit for SCTs

#12

Post by Bigzmey »


Whatever makes you happy Don. :D Spacing EPs 1.3-1.4x apart makes me happy. I would agree that extreme ends need to be spaced differently. But my approach is just the opposite of yours. At the very high powers I prefer larger steps. Let's take SLV set for example. I have 2.5mm, 4mm, 5mm, 6mm and 9mm on the high end. I tried on many occasions to go from 5mm to 4mm, or from 6mm to 5mm, but there just no enough difference to affect the view. If I can't split double with 6mm, I typically would not with 5mm. So, at the end 5mm is sitting unused, and stepping from 9mm to 6mm, to 4mm and finally to 2.4mm works very nicely, but this are 1.5x steps and 1.6 step to 2.4mm.

I am very happy with XWs, the steps are perfect (for me). I wish Delites would be spaced the same way.
Scopes: Stellarvue: SV102ED; Celestron: 9.25" EdgeHD, 8" SCT, 150ST, Onyx 80ED; iOptron: Hankmeister 6" Mak; SW: 7" Mak; Meade: 80ST.
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, 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.

Observing: DSOs: 3106 (Completed: Messier, Herschel 1, 2, 3. In progress: H2,500: 2180, S110: 77). Doubles: 2382, Comets: 34, Asteroids: 255
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Re: Apertura Wide Angle Eyepiece Kit for SCTs

#13

Post by notFritzArgelander »


Bigzmey wrote: Sat Jul 17, 2021 11:18 pm Whatever makes you happy Don. :D Spacing EPs 1.3-1.4x apart makes me happy. I would agree that extreme ends need to be spaced differently. But my approach is just the opposite of yours. At the very high powers I prefer larger steps. Let's take SLV set for example. I have 2.5mm, 4mm, 5mm, 6mm and 9mm on the high end. I tried on many occasions to go from 5mm to 4mm, or from 6mm to 5mm, but there just no enough difference to affect the view. If I can't split double with 6mm, I typically would not with 5mm. So, at the end 5mm is sitting unused, and stepping from 9mm to 6mm, to 4mm and finally to 2.4mm works very nicely, but this are 1.5x steps and 1.6 step to 2.4mm.

I am very happy with XWs, the steps are perfect (for me). I wish Delites would be spaced the same way.
I like spacing at even intervals in exit pupil at the long focal length end and even intervals in mm at the short end. So the KK Orthos are nearly ideal. At the short end one can really fine tune to optimize w.r.t. seeing conditions.
Scopes: Refs: Orion ST80, SV 80EDA f7, TS 102ED f11 Newts: AWB 130mm, f5, Z12 f5; Cats: VMC110L, Intes MK66,VMC200L f9.75 EPs: KK Fujiyama Orthoscopics, 2x Vixen NPLs (40-6mm) and BCOs, Baader Mark IV zooms, TV Panoptics, Delos, Plossl 32-8mm. Mixed brand Masuyama/Astroplans Binoculars: Nikon Aculon 10x50, Celestron 15x70, Baader Maxbright. Mounts: Star Seeker IV, Vixen Porta II, Celestron CG5
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Re: Apertura Wide Angle Eyepiece Kit for SCTs

#14

Post by SpyderwerX »


I tend to space them somewhat tightly starting on the higher mag end, depending on which scope I'm using, target, and how far I can push the sky & seeing conditions.
My Plossl set goes: Including the 3-6 zoom here simply because of its 50* afov, 7.4, 8, 10.4, 11, 13, 15, 17, 21, 26, 32 & 40. Lower 82* I go 4.8, 7, 9, 11, 13, & 16.
~Frankie~ My mind: Always on...Slightly off. :?
Celestron CPC1100 SCT....Celestron Evolution 8 SCT...TeleVue-85 apo...SkyWatcher ST150 achro..ST102 achro..ST80 achro.
Celestron AVX...Orion Atlas EQ-G...SkyTee-2...Twilight-1.
Baader BBHS prism and mirror diagonals + Vernonscope quartz 1.25"
EPs: TeleVue oldie (NJ) & modern Plossls, Widefields, and Naglers + 3-6 zoom & Brandons 6-32.
Astronomik, Lumicon & Baader filters..
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