image too big best way to make smaller

[iwols]

hi using an ed80 with atik 414ex ccd but image is too big is it possible to get in fov,andromeda and orion neb,Is there a x,33 reducer available for the ed80

[cosmojaydee]

This has been covered here 

 

[iwols]

thanks but confused even more now

[cosmojaydee]

 it basically says that a x33 reducer is ok for very small sensors , on larger format you will suffer from terrible vignetting , after some research people found the .5 reducer could work depending on your scope and sensor size , ideally you should stick to a matched reducer for your scope otherwise you could introduce unwanted artifacts. Other methods of increasing FOV is to use camera lenses instead of a scope or to invest in a shorter focal length scope , in any case the M31 is a very large target and would require a focal length of 300-400 max to get any where close to framing it . Another method would be to create a mosaic  If I am off the mark I am sure someone will correct me HTH  

[Davey-T]

What you have discovered is that it takes more than one scope / camera combo to capture all there is to see in the heavens, the ED80 is about middling, as said camera lenses do a good job of wide field and long focal length scopes do a good job of teeny things or close ups of big things.

Bit of a generalisation but you get the idea.

Dave

[Alien 13]

As above just plugged the numbers in and a 135 mm lens would be perfect for the Andromeda galaxy, you can get cheap Takumar M42 thread lenses off auction sites.

Alan

[iwols]

looks like its back to putting my nikon dslr back on the ed80 for the larger objects

[iwols]

or has anyone tried the mosaic feature in sgp,is that any good??

[Scott]

I've only just started with sgpro so havent used the mosaic yet though it looks very promising. regardless of that,mosaics are the way to go with a small chip. this is 8 panes using false colour. 414ex/80ED/0.8 reducer

 

[iwols]

thanks scott what did you use to stitch these together