leighton w wrote:
Thank you all for the kind words and encouragement. The prognosis looks good at this point. The only bad part is that I'll be out of commission for up to 8 weeks after. Bad timing for Barbara and I.
I will try to post an update after my surgery.
This really IS a special place in cyberspace and the only place I feel truly at home. Keep the pics coming, I'll need something to look at.
Bsst wishes Leighton. Will pray for a quick recovery.
I spent the day in downtown Raleigh NC today. Half the day was rain and half bright sun. Went lightweight with the X-Pro2 and a S mount Nikkor rangefinder 2.8cm f/3.5 lens adapted. Below are a couple of doors for Leighton from an old church founded in 1821.
gbohannon wrote: Geek Alert - Technical info to follow
Hi group. I just wanted to pass along some information and an experience of mine that others may find useful regarding adapted lenses and adapters.
As some of us are using these great manual focus lenses adapted to various bodies, one point of potential frustration can be around inconsistency in adapters. It is important for adapters to ensure infinity focus and I agree that is critical, but it seems some adapters are made with specs that are very conservative around that goal. Meaning to ensure infinity focus, some may actually allow focus past infinity. (Meaning actual achievement of infinity may happen before the lens goes to the hard stop marking of infinity). If that makes sense.
I have been using a number of Nikkor rangefinder lenses in LTM mount and Nikon S mount. Since I mainly used the focus peaking feature of the camera body, I never really noticed where the lens was actually focusing in reference to the lens markings.
I recently was using my adapted lenses and X-Pro2 for zone focusing photography and noticed that all my images were out of focus. Since it was happening to all my lenses, I knew it was not a lens issue. To test this, I picked out a target that was 10’ away and focused via live view/focus peaking. All lenses were consistently focusing around the 6.5’ mark on the barrel. Tried it on another adapted body, same thing. The only common component was the adapter.
This is where it is important to take a close look at the tolerances of adapters and flange focal distances. In my case, I am using Fuji X cameras and Nikkor rangefinder lenses and a Leica M mount adapter. The flange focal distance of Fuji X is 17.7mm, the focal flange distance of Leica M is 27.8mm. So, for adapted lenses in this instance to be accurate the adapter needs to be 10.1mm (27.8mm (Leica) - 17.7mm (Fuji) = 10.1mm). If it is thicker, you will not be able to achieve infinity and if thiner it will go past infinity. In either case, the distance scale on the lens barrel will not be accurate. i.e. if you set the lens to 10’ it will not be focused at 10’.
I used a digital caliper (should be in everyones tool kit) and checked my adapter in question. Bingo. It was not 10.1mm.
Below I posted a sequence of images* showing what I did to correct mine. I have had this adapter for quite awhile and is past the window to return.
(Top Left) - shows that my adapter was only 9.94mm thick. This means I needed to increase the thickness by 0.16mm. I could do this by adding a shim in the adapter (was actually made in two pieces).
(Top Right) - after searching for material to use, I found a folio binder cover (plastic) that was exactly 0.16mm thick. Stroke of luck.
(Bottom Left) - shows the base of the adapter with the shims I made out of the plastic.
(Bottom Right) - shows the now modified adapter at the proper 10.1mm thickness.
I am happy to report, that it solved my problems. Focus distance scale on the lens matches what is actually focused, and infinity focus is at the hard stop of the lenses.
I just wanted to share this information in the event someone else runs in to this situation.
Great post George, this is indeed a real issue, took me three adapters to get it right on the Sony, the Kipon ended up working best. Thanks for sharing!
This snapshot is for Buddy. If I remember correctly, he collects NASCAR diecast. This is from the North Carolina Museum of History. North Carolina has deep roots in stock car racing. Again with the X-Pro2 and 2.8cm f/3.5 S mount Nikon rangefinder lens.
Funny how you sometimes catch yourself thinking of forum members when you are out shooting.
mp356 wrote:
Snow Dunes. Taken with the 55 f3.5 Ai on the D7100. Cropped top and bottom. Thanks for looking.
Scott
Beautiful scene Scott. I love snow, but don't have to deal with it the way you do up there. You have a lot of melting to do before tomorrow the first day of spring.
Since it is a little slow on the thread, I will post a few more from my ramble around the state capital yesterday. Still with the X-Pro2 and 2.8cm f/3.5 Nikon S mount from the 1950's.
Thanks for looking.
George
Iron fence around the old church from my earlier post.
Fountain outside the state capital
May only get one shot off defending the capital bldg, but would hate to be the recipient :)
gbohannon wrote:
Since it is a little slow on the thread, I will post a few more from my ramble around the state capital yesterday. Still with the X-Pro2 and 2.8cm f/3.5 Nikon S mount from the 1950's.
Thanks for looking.
George
Nice set of images George. I especially like the iron fence perspective.
Love everyone's work, Ken, Jose, Philippe, particularly liked George's use of the 28 3.5 of yore,
Drove out to Anza Borrego for the bloom that has made national news.
Went where few people go, do not like crowds, it is truly impressive to see little flowers sprouting from hot sand, and entire mountainsides colored by yellow flowers. Here is a teaser.
28mm 2.0 ais with a polarizer and the 18mm 3.5 ais.
Anza Borrego is filling with natural steel statues, this is a statue of a stage coach not yet properly rusted, they ran through here.
The photos do not convey the experience of being present, there are blooms everywhere where nothing is the norm.
Sending prayers from Malmö! Best wishes for you Leighton, hope you´ll recover soon.
//Kristian
leighton w wrote:
Thank you all for the kind words and encouragement. The prognosis looks good at this point. The only bad part is that I'll be out of commission for up to 8 weeks after. Bad timing for Barbara and I.
I will try to post an update after my surgery.
This really IS a special place in cyberspace and the only place I feel truly at home. Keep the pics coming, I'll need something to look at.
D610 + Nikkor 25-50mm f/4 ai-s @ 50mm f/8, ISO 1600 at 1/50s.
The first astronomical findings of Galileo are in this seminal book. Some cropping. Museo Galileo, Firenze.
D610 + Nikkor 25-50mm f/4 ai-s @ 50mm f/8, ISO 1600 at 1/40s.
2-shots focus stacked. Some cropping. Museo Galileo, Firenze.
The book that provoked a lifelong house arrest sentence to Galileo...until his death!
Galileo's Villa facade at Arcetri - Firenze suburb, his last residence
D610 + Nikkor 25-50mm f/4 ai-s @25-30mm & f/8, ISO 800 at 1/50s. After abjuring his astronomical findings, Galileo was sentenced to lifelong house arrest, living confined here almost 10 years, from 1633 to 1642.
Bust of Galileo in the facade of his last residence, Arcetri.
Bad timing for Barbara and I.
