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Found 6 results

  1. Hi all I am using a skywatcher 80ed and nikon d7200 for imaging, I was looking at the Sky-Watcher .85x Reducer/Flattener for the 80ed, I was wondering if this was the best option for my setup for shooting deepsky objects and if anyone has used this field flattener and had any feedback Thanks
  2. Well, not all just the sw ed80 and ed120. I have acquired a taste lately for flat fields and round stars edge to edge. I've never bothered with ff/fr so far, I'd rather spend the money on an extra scope, but I feel I can justify one. But which one, as I would like to improve both my scopes. So it boils down to this: has anyone used either the dedicated sw ff/fr for the ed80 with the Ed120 or the ff/FR for the Ed120 with the ed80 and got good results? And when I say good, I don't mean great (as with the dedicated one), just better than using the scope with out one. If so, which ff/FR did you use to match one scope and slightly improve the other, the ff/fr for the ed80 or the ed120? Perhaps a third party one? (but not too expensive, because it would beat the purpose of buying both the dedicated ones). Something like that: https://www.firstlightoptics.com/stellamira-telescopes/stellamira-2-0-8x-reducer-field-flattener-with-m48-adapter.html ?? P. S. I am using a Canon 600d dslr
  3. Adjustable and suitable for many refractors between 500 - 1000mm focal length. 0.8x reducer and good field flattened combined. Hardly used and in mint condition in box. Looking for £85 plus postage, but open to offers. Please contact me if you need any further info. I can provide pictures if needed. Thanks.
  4. Hi, guys i have a Opticstar ARX200 f/3.9 astrograph which came with a f/3.9 adjustable coma corrector and I am struggling to work out the back focus! I am using a Nikon D5100 DSLR which I know the the air gap is 48mm from sensor to imaging plane. When I use the corrector I can only gain focus with it when it is 0mm but still get major coma around edges of frame. I have tried at every point from 0-55mm and cant gain focus anywhere else?? Anyone any ideas what I am doing wrong??
  5. Hi, I have been doing astrophotography for a year or so now and am looking to upgrade to an explore scientific 102mm f/7 FCD100 triplet refractor, which has a 2.5" hexagonal focuser. Initially I will be using my trusty Nikon D5100 but hope to get a dedicated monochrome camera with filter wheel within a year or so. I would like a field flattener that for one works with this scope, two, is not a reducer, and three, would work for my Nikon now and with the dedicated camera later. I was looking at the Stellarvue field flattener for f/7 telescopes and 2.5" focusers and was wondering would this serve the purpose and work with the HEX focuser that is already on the ES 102? Does anybody have experience with this combination of field flattener and refractor? Any wisdom would be much appreciated. Cheers
  6. Over the years I have done a lot of Excel calculation to solve my astronomy problem when I try to make parts work together. Most of them has been my private and only in Swedish, some of them I have published on a Swedish forum and I believe some people have found them useful. Now I decided to translate them into English and put them on my homepage for downloading. It's always hard to understand Excel sheets that others have put together, but I hope that these ones with a little help of the instructions on my homepage could be interesting and useful to some of you. http://astrofriend.eu/astronomy/astronomy-calculations/astronomy-calculations.html Beware that it could be something wrong in the calculations, if I find something I try to correct it. I don't take any responsible of it, you use them at your own risk ! /Lars
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