Why isn't my field of View any larger?

[Daveskywill (David)]

My photo's on my Meade LX200GPS 10" F10 have always been smaller than predicted with CCDCalc. And my image either through the eyepiece, with ~20mm eyepieces, or with my camera has always been smaller than I'd think or predicted too; Talking of Jupiter in this case, is only about 3/16" at about 100-200x magnification. And I've never seen on Jupiter any more than the equatorial stripes around it with an eyepiece view. No Red Spot. Any advice Why my views and images are so small?

I can provide pics if needed.

David

[raymo]

Firstly, a 20mm EP with your scope only gives around 125x mag, which
will give a fairly small image of Jupiter. You need to use at least a 15mm,[166x] ,
and when the seeing is good, go to shorter ones such as 10mm [250x] or 8mm.[312x].
Silly question, but you haven't got a reducer in your optical train, have you?
Regarding your small photo images, hard to know, as I don't know if
you are using prime focus or EP projection, or what else.
raymo