raydeng wrote:
Oh gotcha. So SOME of the field curvature will go away but a lot of it will remain, as it is inherent to the lens?
Yes, that field curvature exaggerated by sensor stack would be fixed by the PCX.
But as @thrice mentioned, even on film the CV35 shows relatively strong inherent field curvature, that will not be corrected by this solution.
Finally recieved my PCX 5000PM I thought the Distagon 35ZM was a fine lens even without the filter but with the PCX solution it really brings it to a whole new level especially into the far corners.
Fred, thanks for the guidance on the setup in order to use the OEM hood, I went that route however one thing I did was to cut a couple of notches on the last 55mm filter so I can use a lens spanner to tighen and remove the setup should I need to.
thrice wrote:
Yeah. I'm not sure if they will try to further correct the field curvature with the native FE version of this lens but i somehow doubt it.
Do you mean correct it better than the native field curvature?
I doubt that too: the impression given by the CV people who talked about the lens to people visiting the show seemed to be that the FE mount version would correct the stack-induced issues, giving you performance like it would have had on film or a thinner stack..
@haruhikoT bought all the parts. Outside of rubber bands, I shouldn't need anything else, right?
I also am interested in trying this on my Canon 50mm f1.4 LTM. If it helped on the Voigylander 50mm f1.5, perhaps it may help on this lens? I guess that means I should get a 48-55 step up too.
raydeng wrote:
@haruhikoT@ bought all the parts. Outside of rubber bands, I shouldn't need anything else, right?
I also am interested in trying this on my Canon 50mm f1.4 LTM. If it helped on the Voigylander 50mm f1.5, perhaps it may help on this lens? I guess that means I should get a 48-55 step up too.
Right, and yes perhaps also help the canon slightly. You can attach the PCX to the canon by just using 48-55 instead of 43-55.
I am late to the party but I am extremely interested in this solution. I have a Voigtlander 50mm f1.5 and I am wondering if the Opto Sigma SLB-50-5000PM is the best solution?
Does that lens suffer field curvature due to the sensor stack?
It would probably be best corrected by the 10m eksma optics if anything. @HaruhikoT@ will chime in if they get a chance. You could definitely help by measuring the exit pupil.
xujie0987 wrote:
Hi everyone,
I am late to the party but I am extremely interested in this solution. I have a Voigtlander 50mm f1.5 and I am wondering if the Opto Sigma SLB-50-5000PM is the best solution?
You're all terrible enablers. I have a Hawks adapter and pcx on the way. When my friend from Zeiss gets back from NAB I'll order a 35/1.4.
Would anyone be interested in a single 49mm filter ring solution for the 35ZM? Or a 48mm piece of glass, o-ring and retaining ring to put it into the lens filter threads?
thrice wrote:
You're all terrible enablers. I have a Hawks adapter and pcx on the way. When my friend from Zeiss gets back from NAB I'll order a 35/1.4.
Would anyone be interested in a single 49mm filter ring solution for the 35ZM? Or a 48mm piece of glass, o-ring and retaining ring to put it into the lens filter threads?
I am late to the party but I am extremely interested in this solution. I have a Voigtlander 50mm f1.5 and I am wondering if the Opto Sigma SLB-50-5000PM is the best solution?
The reason I want to correct the field curvature is to get a more evenly blurred background when wide open. I used lenses that are not able to focus to infinity before. Depending on how bad it is, it may not be a problem. The only scenario I would want focus on infinity is for landscape shots where the aperture is stopped way down anyways. I don't open up the aperture to do landscapes. I rarely do night shots (and never did it with a 50mm). So as long as the infinity focus is not way off, it is accepatable.
I got a 5m PCX on my way. I intended to use it on my CV35 1.7, but I will definitely try it on the 50.
raydeng wrote:
Does anyone know how to use the 5m PCX with the Canon 50mm f1.4 LTM and focus to infinity?
Adding a 5m PCX filter to a 50mm.lens will reduce the focal lenght of the main lens aprox. 0.5mm.
You might use two stacked adapters: one for M lenses to Sony-E cameras and the other for LTM lenses to Leica M mount cameras. The later has a 1mm. thick flange on the flat side. It shouldn't be difficult to grind down aprox.0.5mm. from that flat side and you'll be on the ballpark of infinity. It depends also on the tolerances of your lens and Sony.E to Leica-M adapter.
@artur5, what if I want to use the Techart pro adapter? I guess I could just get the ltm to leica m and grind it down?
Did I read somewhere that using the TAP allowed focusing beyond infinity so using the PCX with TAP allowed focusing to infinity? Or am I making that up lol?
finally got around to trying the contax g 28 on my kolari UT converted a7 with the 5m optosigma filter. results were quite impressive. looks very capable for landscape at f/4. i shot the bare lens on the UT focused in the center as well as in the corner. the pcx filter negated the field curvature so the center and corner were in the same focus plane:
Wow fantastic result! You must be stoked.
Are you using the TAP or a manual adapter? Did you have to remove shims?
sebboh wrote:
finally got around to trying the contax g 28 on my kolari UT converted a7 with the 5m optosigma filter. results were quite impressive. looks very capable for landscape at f/4. i shot the bare lens on the UT focused in the center as well as in the corner. the pcx filter negated the field curvature so the center and corner were in the same focus plane: http://c1.staticflickr.com/5/4178/34037056410_457ba15122_o.jpg full sized comparison
thrice wrote:
Wow fantastic result! You must be stoked.
Are you using the TAP or a manual adapter? Did you have to remove shims?
definitely stoked. i converted mine to m-mount and a real focus helicoid with an adjustable infinity stop a while back, so no need for shims. don't like AF, so no tap.
Wow.. great results indeed. Thank you @sebboh for sharing!
Since UT mod has similar sensor stack thickness to Leica digital M bodies, this is also great news for Leica owners.
