[Klaus]

[quote name='froeschle' timestamp='1338588665' post='18607']

Could you please specify, which lenses you are exactly referring to?

[/quote]



See

http://www.fujifilmusa.com/products/optical_devices/security/fish-eye/index.html



Specifically

http://www.bhphotovideo.com/c/product/404279-REG/Fujinon_FE185C046HA1_FE185C046HA_1_1_2_1_4mm_F1_4.html

The max. aperture is especially interesting here but it is obviously also not a cheap lens.



Many manufacturers list "megapixel" C-mount lenses which should work fine on the Q - inc. Pentax.



Here's a filtered list (c-mount, megapixel, 1/2 + 2/3 sensor, manual aperture):

http://www.bhphotovideo.com/c/search?atclk=Iris+Operation_Manual+Iris&ci=3659&N=4293342916+4291756354+4291756352+4264951778+4291437653+4291284238+4291172234+4289302490



I haven't tested any of those - just to mention.