Thinking of a project refractor
- Bigzmey
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Re: Thinking of a project refractor
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: 3122 (Completed: Messier, Herschel 1, 2, 3. In progress: H2,500: 2196, S110: 77). Doubles: 2461, Comets: 34, Asteroids: 261
- SkyHiker
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Re: Thinking of a project refractor
I hit "Enter" at Agena Astro for the William Optics 1.25" Binoviewer Package (with 1.25" Wide Angle Eyepieces and 1.6x Barlow), so now I can try it for myself. With everything included for the price I set my expectations accordingly, but the reviews look good.Lady Fraktor wrote: ↑Wed Apr 19, 2023 9:01 pm Many people use BVs with newtonians but I am not sure what OCA would be needed or if modification to the mirror position is required,
a lot of BVs come with a 1.6x
They are relaxing to use since you are using both eyes. When the planets are out I can sit and view for hours without fatigue.
I am really not sure how they would work with a astrograph though.
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Re: Thinking of a project refractor
Those basic prism BVs are surprisingly good. They have been rebranded under many names. I have Orion's version. After playing with them for a year I don't feel any need to upgrade to anything fancier.SkyHiker wrote: ↑Wed Apr 19, 2023 10:37 pmI hit "Enter" at Agena Astro for the William Optics 1.25" Binoviewer Package (with 1.25" Wide Angle Eyepieces and 1.6x Barlow), so now I can try it for myself. With everything included for the price I set my expectations accordingly, but the reviews look good.Lady Fraktor wrote: ↑Wed Apr 19, 2023 9:01 pm Many people use BVs with newtonians but I am not sure what OCA would be needed or if modification to the mirror position is required,
a lot of BVs come with a 1.6x
They are relaxing to use since you are using both eyes. When the planets are out I can sit and view for hours without fatigue.
I am really not sure how they would work with a astrograph though.
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: 3122 (Completed: Messier, Herschel 1, 2, 3. In progress: H2,500: 2196, S110: 77). Doubles: 2461, Comets: 34, Asteroids: 261
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Re: Thinking of a project refractor
The big thing about considering making a dedicated
You will find that eyepiece magnification will change more or less with the
Some of the users on CN seem to get pretty frustrated figuring it all out.
On a side note, have you received you Ronchi eyepiece yet?
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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Re: Thinking of a project refractor
I think the 1.6x is fixed with the Barlow of theLady Fraktor wrote: ↑Thu Apr 20, 2023 3:25 am The big thing about considering making a dedicated BV refractor is that everything works at the native measurements.
You will find that eyepiece magnification will change more or less with the BV+ OCA and of course if you use one different than the 1.6x it will change again.
Some of the users on CN seem to get pretty frustrated figuring it all out.
It has been sitting on my coffee table waiting for inspiration and good weather, too. InLady Fraktor wrote: ↑Thu Apr 20, 2023 3:25 am On a side note, have you received you Ronchi eyepiece yet?
I set up a few nights ago then found out that the software update to my astroberry failed (and that I was not alone in that). I rebuilt it from source code now it's working, and I just set up. It was supposed to be all clear now I see oddly shaped banded clouds. I'll try to at least do a PA and try the Ronchi next time.
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Re: Thinking of a project refractor
This will show up as one side being noticeably dimmer than the other.
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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Re: Thinking of a project refractor
Indeed, both the Bresser AR-127S and also AR-152S use a sub-Lady Fraktor wrote: ↑Wed Apr 19, 2023 4:01 am a few that I have found so far, pros and cons for all.
https://www.teleskop-express.de/shop/pr ... embly.html
https://www.teleskop-express.de/shop/pr ... --OTA.html
https://www.teleskop-express.de/shop/pr ... ctive.html
The search continues!
19/04/22 Edit:
I emailed TS about my idea and #2 is out of consideration, I had forgotten the telescope has a sub-aperture corrector directly in front of the drawtube.
Also, I personally doubt that stating these refactors are of Fraunhofer design is perfectly correct.
Perhaps someone more experienced can correct me now. My understanding is that Fraunhofer design requires a tight spacing between crown and flint glass in range of ~10um. That is the reason why foil spacers are usually used.
However, all Bresser achromatic refractors I have ever seen do not use foil spacers. I have personally dismantled the lens cells of AR102S, AR90 and few smaller ones and they all had a plastic ring spacer >5mm wide between the crown and flint element.
One note about AR102S that may apply to the others in the same range since they use the same focuser. The focuser travel is very short. My 1.25" diagonal required much more out-focus than the focuser was able to provide. I had to buy a 50mm extension tube.
This and T2 thread on the focuser may be an advantage if one wants to fit a binoviewer I guess.
Handful of refractors, a pair of old binoculars, tin box full of plossls and orthos, couple of EQ mounts with some wooden legs
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Re: Thinking of a project refractor
I am not sure of the faster refractors but the slower Bresser I have had seemed more like a Baker than Fraunhofer.
The 102 mm
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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Re: Thinking of a project refractor
I once spoke to a local distributor for Bresser and enquired if they are really Fraunhofer doublets. They did not have a slightest idea what I was talking about and just pointed me to the website where it says Fraunhofer.
Handful of refractors, a pair of old binoculars, tin box full of plossls and orthos, couple of EQ mounts with some wooden legs
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Re: Thinking of a project refractor
R2 and R3 curves are equalized and the air gap compensates for the spherical aberration caused by R2/R3.
It is still considered a contact doublet like the Fraunhofer.
When you look at the spot diagrams the Baker actually seems a bit better for controlling aberrations.
If you ever need actual information on the Bresser telescopes, call or email the shop.
I always get good accurate response from them.
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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Re: Thinking of a project refractor
In the meantime I will just have to get along with using my BVs in the usual way.
One thing I have decided to do is size the tube for use of a mirror instead of prism diagonal
which will negate any cross polarization between the
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
- Lady Fraktor
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Re: Thinking of a project refractor
I did a delivery inspection and all looks well.
A couple of quick bench tests and a look around with it during the day using a 10 mm and 18 mm on high contrast targets shows a nice figure of the lens and crisp/ contrast views.
This is going to make a good platform for a dedicated
I will not be cutting the tube down immediately, more a winter project.
Since shortening the tube will remove the rear baffle I will be making new ones and will increase the count to 5.
Time to get the pencil and paper!
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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