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I had the first clear skies (for a couple of hours) since Christmas Eve yesterday so I seized the opportunity and took some snaps of what I could. Inevitably, I come back with more questions!
I'm using APT and for some reason, the images captured are being saved as "CR2" files rather than RAW files (imaging with a Canon 450D). I can't see where to change the saved image file type in APT, what am I missing?
The images I've posted below of Betelgeuse are the best I could get from yesterday, which are terrible! For me, just getting a reduction in star trails at 20-30 secs is quite the achievement. I'm also imaging through a scope with 660mm focal length (Achromat) on an EQ3, less than ideal until I get the right scope.
I notice here that just on ISO 200-800 the images seem to be extremely bright. Is this the result of light pollution or is there something else I'm missing?
I should also note that I'm using "Bulb mode" on APT, not sure if this has any bearing.
ISO 200 @ 30secs:
ISO 400 @ 29 secs
ISO 800 @ 29 secs
I'm sure this is just one of many hundreds of posts about correct spacings on here - I think I've just about got it but I need to confirm a couple of things with folks who have more experience than me on these matters.
My scope is a Skywatcher Evostar 80ED-DS Pro - one which I'm sure anyone here is familiar with and needs little introduction. I'm using the accompanying field flattener/reducer, which requires 55mm of back focus.
The off axis guider I plan to use is an OVL Off Axis Guider - it is thin enough that in combination with my camera I should have the required back focus provided the connecting T-adapter is thin enough.
My camera is a Canon 550D (mod), which as far as I'm aware will occupy 46.5mm of back focus.
My question is, what would be the best way to connect the Canon to the OAG? Puzzlingly it seems the OAG has a 42mm screw-ring on the camera side, which I don't have an adapter for. Do these exist? Are there any thin models available such that I meet my back focus requirement?
If there are any other issues with what I'm suggesting please let me know. It's always easier to nail it first time than faff around with ordering adapters only to discover they're the wrong size.
I am looking at introducing an OAG to my current imaging setup. I use an Atik 383l plus Atik EFW with a skywatcher aplanatic coma corrector with a 10" skywatcher Quattro.
The obvious choice would be an Atik OAG but with only 55mm of back focus available on the coma corrector I assume I'll need a narrower OAG.
Any help/advice would be great appreciated.
I have a revelation (GSO) coma corrector that I use on my 130 pds with a Canon 1000d. I have noticed that I am still getting some coma. My question is, do I need a spacer between the corrector and the T ring. I can't find any definite information on this but I read somewhere you need 75mm between the rear element and the camera sensor