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Ellery

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  1. Thanks for the tips Olly, indeed a .67 would be great on this scope! I have noticed it's only a focal reducer though, I guess a flattener becomes a must then with all the extra detail "squeezed" in the image field curvature should become pretty bad ? On a side note I found some nice pics made with the WO .8x MkII and an 80ed, it's quite a different scope but it's something ^^
  2. Thanks Julian and Rik I was wondering about the Baader MPCC Mk-II. If I understand well field curvature and coma are two different effects, even though they may be visually similar. What would the outcome be of a CC mounted on a refractor ? I know I'll probably gravitate towards skywatcher's own reducer but was curious to know the factors you should be looking at in reducers. There doesn't seem to be a lot of information on the subject. For example when they say 'optimized for refractors of focal lengths xxx-yyy' what change does it mean in the lens design of the reducer ? What would happen if you mounted it on a scope with greater focal length ? I know that's a lot of questions, bear with me
  3. I just received my Skywatcher 100ED and was looking forward to suit it a little better for astrophotography. I found reviews and comparisons of most popular focal reducers but not many recommendations about their pairing with this particular scope. So far the candidates list looks like this (in no particular order) : Skywatcher .85x Reducer/Flattener : http://www.skywatcher.com/product.php?cat=28&id=179 Astrophysics CCDT67 0.67x Reducer : http://www.astro-physics.com/index.htm?products/accessories/photo_acc/photo_acc William Optics .8x Reducer /Flattener Mk IV http://www.williamoptics.com/accessories/flattener4_features.php William Optics .8x Reducer/Flattener Mk II http://www.williamoptics.com/accessories/reducer_features.php Meade/Celestron 6.3 FR The SW .85x an WO 0.8x Mk IV I'm sure are suited for this scope and should perform in line with their prices. The Mk II version of the WO 0.8x I'm uncertain about, I was looking at its specs and they described it as "optmized for 66mm refractors while also suited for 80 and 90" however in the bottom the Megrez 110 APO is also listed, which gives me some hope. The CCDT67 is commonly used on RCs type scopes but seems compatible with refractors too as long as the focal ratio is f/9 to f/18. I've read about people who have fit it to their SW80ED but there weren't comments on the performance. The Meade/Celestron I have read mixed reviews and seem to require a bit of tinkering to fit. Any thoughts will be appreciated P.S. I have also been wondering what parameters to look for to see if they're compatible with my setup. I only have my DSLR with a T-nose adapter and UHC filter as image train, that means I just have to buy extensions to bring the camera chip at the distance indicated in the reducer specs, and eventually another adapter to fit the reducer to the 2" focuser (as in the Meade/Celestron reducers), right ?
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