Staff note: This post may contain affiliate links, which means Pentax Forums may earn a small commission if a visitor clicks through and makes a purchase. If you would like to support the forum directly, you may also make a donation here.
Shawn67's post on the Fujinon 2.7mm f1.8 c mount lens in the adapted lenses for the Q section inspired me to purchase one.
They are common on eBay, usually in a CCTV fixture,
I got mine for $70. As Shawn mentioned, you do have to shim it slightly (thin brass or even paper) to get proper focus. I also have the Pentax 03 so I thought I'd run a test to check on the coverage of various options.
First is the standard 03 on a Q7:
Next is the 03 lens on the Q7 with its contacts covered with a curve of thin plastic or paper, this defeats the auto cropping of the Q7 and gives a wider view, albeit with a slight amount of cropping on the corners:
Finally, the Fujinon on the Q7:
As you can see, there is a much wider field of view, with just a tiny bit of vignetting on the corners. The Q mount has a slight bit of play in it so you might get uneven borders. The image quality of the two lenses is similar, the Fujinon might be a little sharper but has a little more fringing on the extreme edges. Both lenses have fixed F-stops, the three stop difference makes the Fujinon much more usable for available light hand-held. With SR on it is possible to get good hand-held exposures at 1/4 second. The Fujinon is more limited in its focusing capabilities, you can unscrew it slightly to get a closer focus, but it is tricky. A thicker shim will get you into extreme close-up territory, but the bulk of the lens will make it hard to use without causing a shadow.
So, for about the same price (you'll need a c mount adapter for the Fujinon), there are two viable fish eye options for the Q, not counting auxilliary lenses. The Fujinon makes a complete circle on m43, good for full horizon shots. There is also an adjustable stop version but you'd probably have to buy that new, it is
in stock at B&H for $459, although the depth of field of the wide open version is probably deep enough for most applications, diffraction effects would probably creep in if it was stopped down much.
Last edited by Unregistered User; 10-12-2018 at 09:41 AM.
Reason: typo