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As already posted a 165 F2.8 Pentax 6x 7 lens has an aperture of 59mm and with a KAF 8300 camera covers 285 x 377 arc minutes at 6.73 arc seconds per pixel which is heavily undersampled which does not seem to matter much with really widefield images.
It is an excellent lens that is sharp wide open at F2.8. I have used it several times.
I have used several camera lenses over the years. The Pentax 6 x 7 have the advantage of lots of backfocus. I am not sure Canon EF has as much backfocus. There was a comparison table somewhere and Pentax 6 x 7 were up at the top.
These are what I have used:
1. Pentax 6x7 165 2.8 a top notch performer, the best. Quite cheap. Probably under $200 or so.
2. Pentax 6x7 55mm hmmm not so good but cleans up around F4.Also not bad binned 2x2 (another way round aberrations of some lenses).
3. Pentax 67 75mm F3.5 - lovely, very sharp. These lenses are under $100
4. Pentax 6 x 7 300mm F4 quite good a bit of chromatic aberration. About $350 on Ebay.
5. Canon FD 85 so so. Quite a bit of chromatic aberration. Not worth much at all.
6. Nikon 50mm F1.8D and also the D version - great.
7. Nikon 105 F2.5 Not bad, a bit of chromatic aberration but good.
8. Nikon 180mm F2.8 ED. One of the better lenses. Some chromatic aberration but stop down to F4 its nice. Around $400
9. Nikon 85mm F1.8G quite nice but F2.8 onwards needed. new these are around $600 or so.
10. Samyang 24 F1.4 one of the better lenses from F2 on. About $400 or $500. Maybe more.
You can sometimes get the Pentax 67 300mm F4 EDIF which is the one to get. It often goes for around $1000. Marco Lorenzi used one for quite a while and those images were stunning. That was with a Proline 16803 which is many times larger than the KAF8300 but you get the idea.
KAF 8300 is micro 4/3rds sized so equivalent full frame aperture is double. So 300mm on a full frame is 600mm equivalent with the 8300.
Basically you would get 2.6X wider field of view than your FLT110.
That is enough to capture the entire Eta Carina nebula with some space around it. A nice FOV really. You don't want it too wide unless you want to image the Milky Way.
Greg.
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