Astro-Tech 2" field flattener

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funoooo
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Astro-Tech 2" field flattener

文章 funoooo » 週二 04 5月, 2010 20:07

Astro-Tech 2" field flattener for Astro-Tech and TMB refractors, plus any other brand of f/6 to f/8 refractor

HK$ 900.00 (全新) 一個
http://www.astronomytechnologies.com/pr ... =17393&c=0

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willis
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文章 willis » 週二 04 5月, 2010 21:49

Only one left?

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funoooo
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文章 funoooo » 週二 04 5月, 2010 22:40

willis 寫:Only one left?
Yes

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willis
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文章 willis » 週二 04 5月, 2010 23:00

In fact I tried it on Equinox 80ED. The result is good on APS size DSLR, say 350D or 40D. But not for full frame, say 5D II. Anyway, it is a good value flattener.

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funoooo
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文章 funoooo » 週二 04 5月, 2010 23:08

willis 寫:In fact I tried it on Equinox 80ED. The result is good on APS size DSLR, say 350D or 40D. But not for full frame, say 5D II. Anyway, it is a good value flattener.
Thanks for your comment.

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willis
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文章 willis » 週二 04 5月, 2010 23:16

funoooo 寫:
willis 寫:In fact I tried it on Equinox 80ED. The result is good on APS size DSLR, say 350D or 40D. But not for full frame, say 5D II. Anyway, it is a good value flattener.
Thanks for your comment.
My result agree with Sky & Telescope's review:

A review in Sky & Telescope magazine of the Astro-Tech field flattener and the Astro-Tech AT106 refractor said the field flattener was “extremely easy to use with any SLR camera. You simply screw on the appropriate T-ring, connect your camera, and slip the flattener into the AT106’s 2-inch focuser. Daylight shots made two things immediately apparent – the field flattener does not change the telescope’s focal length (it’s a true zero-power flattener), and it sharpens images at the edge of the field . . . At night, star images in the corners of my Nikon D300’s APS-format frame, while vastly better than those recorded without the flattener, still showed a slight elongation . . . By focusing at a point slightly off center, thus balancing the imaging performance between the center and edge of the field, I could fill the frame with nice, round star images. For photographers shooting day or night, the flattener is well worth its current $150 price.”

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文章 funoooo » 週日 09 5月, 2010 23:16

Thanks Willis,

You have done a great research. Now that is very difficult to find a nice flattener and reducer for refractor. For SC, we still can find some reducer from Meade and Celestron. (That is a lucky draw, sonetime you can't find it in store and second-hand market. I buy my second hand reducer 0.33 and 0.63 from Astromart, that is so expensive.) For the refractor, that is extremely less product in the market. In hong Kong, I think that is a very worst case. Now I can only know Tan14 and Astro have some reducer and flattener for refractor, and also that is not cheap. :oops:

This time we have tried the Astro-Tech Flattener. The result is out of expectation. Base on this low price, I can take the nice photo. I think that is a good product. I will try to get some back to Hong Kong.

Anyway, thanks for your nice support and review. Thanks Willis.

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