Tele Vue APO Design and Build “Secrets”
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Re: Tele Vue APO Design and Build “Secrets”
This falls right in line with my post on the very same subject. It's nice when we all agree.. viewtopic.php?f=65&t=2478
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- DeanD
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Re: Tele Vue APO Design and Build “Secrets”
I like the philosophy that one person builds each scope from start to finish: and the home-workshop look of their benches, telescope cradles etc. I reckon I could cope with a job like that!
I love Al's definition of an
Cheers!
Dean
Binos: Steiner Wildlife XP 10x26, Swarovski 8x30 Habicht, Zeiss SFL 8x40, Vanguard Endeavour 10.5x45, Fuji FMTR-SX 10x50, Tak 22x60, Orion Resolux 15x70
Eyepieces: way too many (is that possible?), but I do like my TV 32mm plossl, 13mm Nagler T6, 27mm Panoptic and 3-6mm Nagler zoom, plus Fujiyama 18mm and 25mm orthos and Tak 7.5mm LE
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Re: Tele Vue APO Design and Build “Secrets”
Al has always been one to cut-to-the-chase... no hocus-pocus nonsense.
- notFritzArgelander
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Re: Tele Vue APO Design and Build “Secrets”
https://www.telescope-optics.net/apo_refractor.htm
That's a real definition. Without doing the work to show Al's definition is as good or better I'll just have to regard it as highly effective marketing hype. It's distasteful to me but obviously effective.
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Re: Tele Vue APO Design and Build “Secrets”
However eyepieces can also introduce
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- Lady Fraktor
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Re: Tele Vue APO Design and Build “Secrets”
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: Tele Vue APO Design and Build “Secrets”
True, but as a field test it is a pretty extreme one and can really sort out the "dghent wrote: ↑Thu Aug 22, 2019 6:59 pmHowever eyepieces can also introduceCA and other effects. By his measure, a telescope could go from being anAPO to not being anAPO depending on the type and quality of the eyepieces being used to look at Sirius. This is not a quantitative analysis of the telescope's optics alone. At best, it's a field test with several expensive predicates.
I like the definition because it is something that can be done by anyone and gives a very good idea of the "
Personally, I am a fan of field testing in general: a field test of a star image can tell you an awful lot about the quality of a scope, an eyepiece, seeing conditions etc. without having to lab-test. After all, it is the view in the field that we all want.
And wrt Gabby's comment about sales: I suspect she is right: TV doublets are quite expensive in comparison to the Chinese competition, and optically they wouldn't be any better than the best of the Chinese ones. I suspect my TV76 is around 1/6-1/8 wave... (from my field testing! )
- Dean
(
Binos: Steiner Wildlife XP 10x26, Swarovski 8x30 Habicht, Zeiss SFL 8x40, Vanguard Endeavour 10.5x45, Fuji FMTR-SX 10x50, Tak 22x60, Orion Resolux 15x70
Eyepieces: way too many (is that possible?), but I do like my TV 32mm plossl, 13mm Nagler T6, 27mm Panoptic and 3-6mm Nagler zoom, plus Fujiyama 18mm and 25mm orthos and Tak 7.5mm LE
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Re: Tele Vue APO Design and Build “Secrets”
They remind me more of the Vixen apochromatic with a heavier build to them. More a "poor mans Tak"
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
- notFritzArgelander
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Re: Tele Vue APO Design and Build “Secrets”
I agree on performance. OnLady Fraktor wrote: ↑Fri Aug 23, 2019 5:54 am TeleVue does make a good quality refractor, I just find them a bit over priced nor would I place them in the ranks of AP, TEC, Tak, CFF etc.
They remind me more of the Vixen apochromatic with a heavier build to them. More a "poor mans Tak"
https://www.takahashiamerica.com/takaha ... scope.html
https://www.highpointscientific.com/tel ... O8QAvD_BwE
Tak accessories to make it flat field will narrow the price gap but more than a 1K$ will remain.
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Re: Tele Vue APO Design and Build “Secrets”
The TV makes a great widefield telescope and I also found it excellent as a daytime birding telescope, colour rendition was superb.
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
- notFritzArgelander
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Re: Tele Vue APO Design and Build “Secrets”
That fits with my impressions from quick views through other folks' scopes.Lady Fraktor wrote: ↑Fri Aug 23, 2019 6:21 am I did a comparison between the TV-76 ($1650USD) and Tak FS-78 ($1200USD) a few years ago, I felt the Tak put up slightly better views for planetary.
The TV makes a great widefield telescope and I also found it excellent as a daytime birding telescope, colour rendition was superb.
- DeanD
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Re: Tele Vue APO Design and Build “Secrets”
Me too. It doesn't like going over ~ 150x, but gives great lower-power views.notFritzArgelander wrote: ↑Fri Aug 23, 2019 7:18 amThat fits with my impressions from quick views through other folks' scopes.Lady Fraktor wrote: ↑Fri Aug 23, 2019 6:21 am I did a comparison between the TV-76 ($1650USD) and Tak FS-78 ($1200USD) a few years ago, I felt the Tak put up slightly better views for planetary.
The TV makes a great widefield telescope and I also found it excellent as a daytime birding telescope, colour rendition was superb.
Binos: Steiner Wildlife XP 10x26, Swarovski 8x30 Habicht, Zeiss SFL 8x40, Vanguard Endeavour 10.5x45, Fuji FMTR-SX 10x50, Tak 22x60, Orion Resolux 15x70
Eyepieces: way too many (is that possible?), but I do like my TV 32mm plossl, 13mm Nagler T6, 27mm Panoptic and 3-6mm Nagler zoom, plus Fujiyama 18mm and 25mm orthos and Tak 7.5mm LE
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