Mamiya 50mm f/4.5 Ultra Wide Angle Lens for Mamiya 7 Cameras. $739.00 (3 used & new offers) Lens Rear Cap for M42 42MM Screw Mount Lens TAKUMAR MAMIYA.
Equivalent 35mm Focal Length 25mm Angle of View @ Infinity 81° Filter Size 77mm Elements/Groups 11/8 Shutter Seiko #1 mechanical leaf shutter, 1 second to 1/400th and T. Shutter speeds in full stops only. F/Stop Range f/4.5 - 32 with 1/2 stop calibrations and stop-down preview feature Flash Synchronization PC socket for electronic flash connection on lens barrel. Flash sync at all speeds. Minimum Focus Distance 27.9cm (10.98') Dimensions 73 x 94mm (2.87 x 3.70') L x W Weight 780g (27.5 oz) Note This lens fits all RB67 models and includes Lens Mount Adapter Ring #301245 for proper fit on the RB67 Pro SD.
I don't know if it's exactly the same lens but I've used the 50mm f/2 Mamiya Sekor kit lens off of a 500 DTL: Rest of the test images: Nice lens and good colours but I haven't used it too much because I have so many different 50s. My initial impression was that the M/S 50mm f/2 is sharper than the Pentax M 50mm f/2 but I haven't tested flare or other characteristics. I believe that there are other Mamiya lens samples in the M42 crew thread. It's probably worth getting a cheap adaptor, unscrewing the locking tab from it, and leaving it on the lens permanently.
That is the correct type of adaptor; it is a knock off of the OEM Pentax model. The locking tab is visible at the 9 o'clock position in the first image on the ebay page. On the Pentax adaptor the tab is held on with a small screw and the copy is likely the same. Any half decently manufactured copy is probably close enough that it will work even if the tolerances are a bit sloppy. I can't vouch for any particular vendor or manufacturer of 3rd party adaptors as I've only used the Pentax one. I bought several used years ago and haven't needed more yet. You'll ike the Mamiya Sekor 50mm f2.
Lovely colour rendition and reasonably sharp. I sold mine recently but not due to a dsiappointment in results, more because other lenses have been getting more usage and a need to rationalise my lens collection. Here's some sample pics. Wide open at my local market. I'd love to try it out on my camera, but don't have an M42 adapter. So my second question is if this cheapo from eBay would work?I'll caution you against getting the 'cheapo' adapter.
You will most likely find, as I did, that the tolerances are much closer on the Pentax version. I tried a cheap one and almost had a heart attack when I had trouble getting it off my new camera. Save yourself $10 + shipping and get the Pentax version, you will in the end anyway. (And no, I don't get a kickback from Pentax.) Good luck and enjoy the inheritance. (I had a 1000 DTL at one point, good camera.).