dawson Posted May 26, 2013 Share Posted May 26, 2013 So they speed up a given optical system, but do they increase greatly the field of view, or are the two so linked you can't do one without the other? James Link to comment Share on other sites More sharing options...
Guest CodnorPaul Posted May 26, 2013 Share Posted May 26, 2013 http://www.isomedia....al_reducers.htm Does this help James? Link to comment Share on other sites More sharing options...
dawson Posted May 26, 2013 Author Share Posted May 26, 2013 Yes, that is much clearer than the websites I'd found. But would using a focal reducer to make my f/15 Mak faster (say 15 x 0.66 = f/9.9, or 15 x 0.33 = f/4.95) give the same FoV of scopes with these intrinsic speeds? [No, I just found the answer to this on this thread: http://stargazerslounge.com/topic/119797-focal-reducers-and-field-of-view/] Thanks. James Link to comment Share on other sites More sharing options...
xanthic Posted May 26, 2013 Share Posted May 26, 2013 Get that big dustbin, I mean Dob mounted! Link to comment Share on other sites More sharing options...
dawson Posted May 26, 2013 Author Share Posted May 26, 2013 It's on rings and a losmandy plate ready, I just can't collimate the blinkin' thing. I might have another go today with Dion. James Link to comment Share on other sites More sharing options...
Guest Posted May 29, 2013 Share Posted May 29, 2013 I have the Antares screw in. It reduces the magnification by 2 and increases the field of view by about 1.7. I use it for afocal deep sky photography with up to 8 seconds' exposure. Yes, I'm that nutty. Link to comment Share on other sites More sharing options...
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