On the Bertele: The lens element does not float to counter focus shift.
Chris does use an indexed cam to counter a change in focus when the lens is used at nearest focus.
I did discuss an idea that could be implemented for correct focus shift: couple the Aperture Ring with the Barrel. This could be done on a Jupiter-3 by fixing the aperture ring into position with the focus mount and turning the entire barrel to set the F-Stop. The Aperture ring of the J-3 (and 5cm F1.5 Sonnar) is screwed into the barrel using a fine thread. The barrel moves relative to the Aperture Ring. Construct it so it moves to correct the focus shift.
boojum
Ignoble Miscreant
I'll just throw up another pic from the Bertele + M9 series I shot a year or so ago. This old dear has not been to sea in a long while and I do not think she will be out in the near future. The Captain Conner, resplendent in rust and disuse. She may the the "shelf queen" of the marina.
Editorial comment: This is a very nice lens. It goes about as far as a lens can go in quality without being rude. The colors are well saturated but not garish, the images are sharp but not harsh. It just pulls what it sees into a neat package and dumps it onto the sensor. It is especially good with skin tones. I'll find a couple skin tone ones and post them. I do not use this lens enough. It is a true gem. It is the culmination of a great design, executed by a master craftsman with good guidance and wisdom from "others."
Editorial comment: This is a very nice lens. It goes about as far as a lens can go in quality without being rude. The colors are well saturated but not garish, the images are sharp but not harsh. It just pulls what it sees into a neat package and dumps it onto the sensor. It is especially good with skin tones. I'll find a couple skin tone ones and post them. I do not use this lens enough. It is a true gem. It is the culmination of a great design, executed by a master craftsman with good guidance and wisdom from "others."
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Miles.
Beamsplitter
Vintage boats.. hmm... I've been looking for a hobby more expensive than Sonnar lenses...
boojum
Ignoble Miscreant
"Back in the day" when shopping for a good stereo it was wise to bring along a good LP or CD of voice to listen to the rigs with. We all pretty much know what voices sound like. In cameras it may translate to skin tones. We all pretty much know what natural skin tones look like. Here are a couple of them which I like. The skin looks like real skin.
The first shot is at the Seaside Carousel in Seaside, OR, just some folks who will be getting their picture drawn by David who does that. The second is my old friend, Marshall, as we eat lunch at a Thais joint in Seaside. The skin color is authentic without being pushy. That's what I like about this Bertele lens, it has manners. ;o)
Shot #1 M9, shot #2 M240.
The first shot is at the Seaside Carousel in Seaside, OR, just some folks who will be getting their picture drawn by David who does that. The second is my old friend, Marshall, as we eat lunch at a Thais joint in Seaside. The skin color is authentic without being pushy. That's what I like about this Bertele lens, it has manners. ;o)
Shot #1 M9, shot #2 M240.
