Hi Chris,
Yeah, I'm a little puzzled too, I've attached one of my Fits frames converted to JPEG & you will see the FOV is larger than the final product... DSS & Startools both seem to change the FOV slightly on processing & I'm not yet sure why that is.
You may well be right on the extension tube use, my F6.3 reducer is attached direct to the back of the SCT, I then have used a 1.25" visual back (wouldn't be 100 - 120mm long though) then camera.. didn't know much about using them so, will look into that. I have used the same method for the f3.3, haven't processed that data yet... DSLR will not come to focus with the f3.3 but, the ZWO does...
Might see about getting some extension tubes & using them with the f6.3 to see what happens.
PS: I don't find your comments to be bugging at all mate, this is how I go from position of no knowledge at all to gaining a little knowledge from folk who have been there, done that.. that is what makes this forum such a great place...
Cheers
Quote:
Originally Posted by ChrisV
Nice going Carlton. But one thing is puzzling me - why is your FOV so small. It should be much bigger. You should be getting in a larger chunk of M42 with these reducers, especially the x0.33.
Do you have the reducer directly attached to the camera? You might need more spacing between the camera and reducer to get the focal reduction up to the advertised amount. From memory the 0.63 needs quite a lot - about 100-110mm, the 0.33 needs less. You can look it up for your specific reducers.
When I used these reducers on an SCT I had the reducer attached to the visual back, then an SCT-T adaptor, then a variety of T-spacers to connect to the ASI224MC (which has a T-thread). A bunch of different T-spacers came with my Meade reducer. You can just test it in the backyard against no reducer to check out what reduction you get, and then try astrometry.net to figure out your actual FOV.
Not sure why its black and white is it something to do with DSS settings? Wish I had some clear skies right now - plus there would be the bonus that I'd bug people less with my stupid comments on their threads
|