I have a Canon SX50 HS. For some reason, I am only getting 2 mb size files. Is that right?
I have it set to 9M 4000 by 2248 in the "L" section.
When I wanna make it into 16x20 prints in shutterbug, etc.. it doesnt look right. or come out clear
Whats the best aspect ratio to set it to?
The native resolution for the sensor is a 4:3 ratio so setting it for other ratios (which can be done in the menu system) gives away important data which might be wanted later for a print in a different ratio. Your example is at a 4:5 ratio which can be set in camera but I strongly recommend it be done with editing software starting with a photo shot at the native resolution.
Also to get the highest quality image in jpg format you need to set the camera to save in Large Fine (page 147) which is represented by what looks like a quarter round trim molding with an S inside it. Since memory cards are pretty cheap these days I again recommend using that setting for all photos unless you intend to shoot in RAW & convert to jpg's later.
SEE pages 41 & 73 of the manual. IF for some reason you still get something other than a 4:3 ratio use Program & try again. (I prefer program because it allows far more control via Exposure Compensation & Flash Exposure Compensation.)