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    Remounting lens in Copal

    This does look like a solid method for keeping the lens calibration consistent between different shutters (and definitely the method I would prefer!); or at the very least a good benchmark/baseline to start at before further optical tests and tweaking to see if further improvements might be...
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    Intrepid making new lens with mech shutter

    Their prototype shutter looks 3D printed, which would be a good way to guarantee a lifetime of spare parts availability, aside from perhaps the electronics for actuation. It will be interesting to see if once they have completed the proof-of-concept they will switch over to machined aluminium or...
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    DIY projects

    Thanks for the info! Good to hear that those helicoids are satisfactory.
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    DIY projects

    Very cool! I've pondered whether a hybrid 6:17 film/digital camera could be viable, but the amount of shifting needed to cover even close to the full film size with a digital back would be rather impractical for a host of reasons: your project is a great practical solution! This is something...
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    Your favourite “bang for the buck” lenses

    I can happily vouch for the Pentax 645 D-FA 55mm f2.8. I use it on the GFX50R with a modded tilt-shift adapter and stitch 2:1 panoramas from 11mm shifts. The edges and corners are good ( not great ), and it needs to be stopped down for edge sharpness. It's never bitingly sharp across the...
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    Positive feedback for JeffK

    Purchased a Cambo WRS mount & helical from JeffK. The transaction went smoothly with great communication, and the item was securely packaged and arrived quickly and safely. Would be more than happy to purchase from JeffK again!
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    Grandagon 65mm N MC usable image circle on digital?

    I will certainly do that! Might be a wee-while away, but I'll report back when able.
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    Grandagon 65mm N MC usable image circle on digital?

    Thanks everyone for your opinions and experiences; the Grandagon is now firmly on the list! I've started poking around for a candidate to purchase. I'll broaden my net to include the Sinaron W and the Caltar-II N, but overall there are plenty of inexpensive copies out there by the looks of it...
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    Grandagon 65mm N MC usable image circle on digital?

    That's a brilliant find with the MTF chart; I had hunted for one but was not able to find anything official. The 20lp/mm line is very encouraging, although it is beginning to suffer a little near the edge of my intended image capture circle. Edges should be quite even with the centre, corners...
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    Grandagon 65mm N MC usable image circle on digital?

    Hello all, just wanting a few opinions on the Rodenstock Grandagon 65mm f4.5 N MC. I'm planning out a set of tech lenses for landscape work, and the Grandagon 65mm has been mentioned a couple of times fairly recently, with users being pleasantly surprised with how well it performs on digital...
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    Mamiya 645 AFD - Viewfinder Magnification Solution

    Well I found the article, but it only goes over a few different options, such as the FD402, a cheap monocular and the Zeiss. Not really much info but may be of interest to someone. https://www.josephholmes.com/news/2009/4/9/getting-top-quality-from-medium-format Out of curiosity, you are...
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    Mamiya 645 AFD - Viewfinder Magnification Solution

    I'd be curious to know what other options are available as well, or at least experiences with the FD402. There was an online blog post I read a few years ago of which also sent me down the monocular route. After wasting a few dollars on one of the cheaper ones that barely seemed to magnify...
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    An optical mystery from adapted Mamiya N 43mm f/4.5 L lens

    Curious as to whether there will be a repeat test of lens cast with the GFX100S? This thread has me rather fascinated with this lens, and I'm also certainly interested in whether the 100mp sensor may actually be the perfect (more affordable) digital back for shifting.
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    Phase One glass and Fuji GFX

    Just saw this today. It seems that Kipon now have a pre-order running on two types of Phase One - Mamiya 645 / GFX adapters. Both have electrical contacts for aperture control, but neither appear to have autofocus. One has the 0.8x focal reducer built in. Early birds get a discount. I don't...
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    Phase One glass and Fuji GFX

    Kipon will probably be your best hope for something in the future. They now have a Contax 645 adapter for GFX with a 0.8x focal reducer and full aperture control. They also have a Mamiya 645 to Sony E adapter with full aperture control available. They also made a post on their FaceBook page...
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    My Phase One DF body doesn't like my adapted lenses . . . .

    I ran some more tests yesterday, and safe to say I'm even more perplexed than I was earlier. I'm now not convinced that it's the digital back(s) alone. It's purple. I did take the shot outside, as there wasn't enough light inside the house, so I took some shots of the garage door from...
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    My Phase One DF body doesn't like my adapted lenses . . . .

    I usually wait until the orange light on the back stops blinking and it beeps. I would expect that is sufficient? The body doesn't let me actuate the shutter until the back is ready. Here's hoping it's a random glitch from a combination of things. I spent yesterday evening and this morning...
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    My Phase One DF body doesn't like my adapted lenses . . . .

    Thanks for the response. (y) Interesting idea, but I sat down to have a look at the cameras to see if it would be plausible and I don't know if that could have anything to do with it. One lens doesn't make any contact with the camera pins, the other should clear it, and the third lens I was...
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    My Phase One DF body doesn't like my adapted lenses . . . .

    Hello, I thought share my ongoing experience with the rather bizarre behaviour of one of my Phase One DF bodies when using two of my adapted lenses at certain shutter speeds. I noticed that some of my photos had pretty extreme purple fringing while using my Pentax A 35mm lens a couple of months...
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    Adapting Pentax A 645 35mm to Mamiya 645

    There is very little to complain about in those images with regard to resolution; pretty good even in the corners. I've had another play with my lenses out in the field, and so far the purple fringing has not happened again. Maybe it was a battery issue, maybe just something odd with that...
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