rdeloe
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 Re: Architectural Tilt/Shift options for the A7? | |
Mark, I\'ve heard great things about that Pentax 67 zoom from people who used it on a Pentax 67 with film, but it\'s a monster. I have no knowledge of how it works with a high resolution digital sensor. Takenwild\'s comments about flaring and softness on some of the 67 lenses known to be excellent gives me pause. Also, I specifically asked Mirex about this lens and they said it should not be used with their adapter because it\'s too heavy. The lens weighs 1200 grams. They said the tilt mechanism can\'t carry that load. I can easily see this being a problem because it\'s just a friction hold.
A couple things regarding the EOS-NEX Mirex adapter:
(1) Takenwild mentioned flocking. This is actually very important and has to be done. I have yet to find any adapter that doesn\'t benefit from flocking. The source for the material is Edmund Scientific. They sell a paper flocking material with glue back that is used for telescopes. It\'s ideal. Look for #55, 20\" x 30\", 2 Sheets, Adhesive Flock Paper Stock No. 54-585. It\'s not expensive, but you get a lifetime supply!
(2) I mentioned offline that Mirex adapters have different designs for rotation. The P645-EOS adapter has a lever you have to engage, and then defined positions you rotate into; releasing the lever locks the position. The EOS-NEX adapter uses pressure. In between the pieces that rotate there are six holes. Each hole has a spring and a ball bearing the spring presses against the other surface. They supply them with light springs and ship a set of heavy springs. I recommend you ask them to ship it with the heavy springs installed. My A7r requires a dead weight mounted to the bottom, and in the portrait orientation, the heavy springs are just strong enough to prevent it from rotating freely. If you ever put a battery grip on your A7rII, you may encounter this problem too. It\'s not hard to change them out yourself but you might as well get them to do it for you.
Here is a link you can use to access test shots of the SMC Pentax-A 45-85/4.5 shifted up 15mm on the P645-EOS adapter. I adjusted white balance and exposure but that\'s it. Each file is labelled with the focal length. The lowest number in each set is f/4.5, and they go up to f/32. These were shot on an A7r in RAW and exported from Lightroom as high resolution JPEGs.
This link isn\'t permanent, but I will leave the files up as long as I have the space on my Drive share.
https://drive.google.com/open?id=0B7LdVznTJdvWT2VOdG15cDlaelk
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