I second the recommendation of using a lens as an alternative.
I use a 300mm Pentax f/4 which is a wonderful lens.
It's not designed for a 35mm full frame but would be a good match for the 8300 chip.
The image quality is great with the lens wide open with a 75mm aperture.
Here are some shots. on an ST-X10ME.
http://members.iinet.net.au/~sjastro/ic4701c.html
http://members.iinet.net.au/~sjastro/IC4628c.html
http://members.iinet.net.au/~sjastro/rcw102Ha.html
http://members.iinet.net.au/~sjastro/rcw133c.html
Steven