+Bino-viewer Posted December 22, 2015 Share Posted December 22, 2015 (edited) One more from Sunday evenings Lunar session. Same set up, my 5.2 inch refractor, unpowered alt-az mount (DM-6) This time my 4x Powermate was used. Prime focus method again, Sony A7s mirrorless full frame, 1/125s, iso 800 Cropped to highlight Copernicus crater. Again, minimal adjustment using the simple editing tools on Mac Photos. Do you think i'm reaching the resolution limits of my refractor ? The next step for me will be to try a modified high framerate camera, then next year i'm going to look at a dedicated Lunar / Planetary camera from ZWO asi Comments welcome please. Whats the next thing to try....? Edited December 22, 2015 by Bino-viewer AstroHobbyman, Werisit, BAZ and 1 other 4 Link to comment Share on other sites More sharing options...
+seven_legs Posted December 22, 2015 Share Posted December 22, 2015 Nice shot, looks good to me Link to comment Share on other sites More sharing options...
+Graham Posted December 22, 2015 Share Posted December 22, 2015 Hi Rob Try sticking a spacer tube in the Barlow might get it up to 8 X Link to comment Share on other sites More sharing options...
+Bino-viewer Posted December 22, 2015 Author Share Posted December 22, 2015 (edited) If i use my 4x Powermate Graham, and then put my 2x Powermate in on top of it will this give me 8x anyway ? So my scope at F/7 then effectivly becomes F/56 ? I tried this on Sunday night. I got a very dim image as a result, and had to use iso 16000 on the camera to 'brighten it up' At what point do you think do i reach my limits of what the scope can resolve with 5.2 inches of aperture ? Is there an ideal focal ratio per inch of aperture ? Edited December 22, 2015 by Bino-viewer Link to comment Share on other sites More sharing options...
+Graham Posted December 22, 2015 Share Posted December 22, 2015 Dont know if there is an ideal ratio. The main problem is the size of the chip in the camera. Once you get a planetary camera the difference will be unbelievable. That crater with the same set up will fill the frame. No cropping needed. Link to comment Share on other sites More sharing options...
Werisit Posted December 22, 2015 Share Posted December 22, 2015 That is an excellent shot. I'm really surprised you got that with a single frame. I suspect that the resolution of the 132 will exceed the seeing 99.9% of the time. Link to comment Share on other sites More sharing options...
Doc Posted December 23, 2015 Share Posted December 23, 2015 Lovely image Rob. I would go for the rille that runs down the centre of the Alpine Valley, it's only 700m wide and very hard to see. Also Rimae Triesnecker you need a 500mm scope to see that one visually but to photograph it, I'm not sure.. I have seen glimpses of it with a 16" scope but it's hard. Link to comment Share on other sites More sharing options...
Guest Posted December 23, 2015 Share Posted December 23, 2015 One of the best Copernicus photos I've ever seen. I would say the next thing to try is stacking multiple frames. Although Microsoft ICE was designed for stitching, it also stacks very well, too. What I find with webcam-type solutions is the small field of view. I take full disc frames with a DSLR and when I have around 200 it takes an hour to stack. I tried using Registax but my computer didn't have enough power. Link to comment Share on other sites More sharing options...
+Bino-viewer Posted December 27, 2015 Author Share Posted December 27, 2015 Thankyou all for your nice comments. They are appreciated. Plenty more to go for of course with the moon. Looking forward to the next session, and my Dob will soon be ready for action. Link to comment Share on other sites More sharing options...
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