Went the OptoSigma route at the end, as besides being a little cheaper, it was immediately available, rather than have to wait up to six weeks for the Eksma. Should receive it in a couple of days instead
Curious to see if I'll manage to focus my ZM at infinity even without shim removals, as my stock one seems to already focus past infinity both with the VM close focus adapter and the TAP parked at infinity.
Thank you everyone that has contributed to this insightful thread and painstaking research that underlies the results.
I plan to use the Contax G 28, 45 and 90 lenses I own ( maybe a G 21 in future )with the Nikon Z6. I have ordered the TZE-01 to mate with the TA-GA3 and plan to use this combo for MF mainly.
Any advice on the PCX filters for the 28 and 21 G with the Z6 that could help would be greatly appreciated. Based on the Kolari Z6 surgery feedback and latest info on sensor stack thickness of the Z6(1.1mm or really 2.3mm?) would it be safe to assume that the PCX 1500 reverse filter might be an ideal fit for the G28 & 21? Perhaps some of us might have info on this to share already?
Thanks in advance for your input and assistance.
-lestor
Heavy vignetting seen with the current setup(55-52mm step down ring & PCX rev mounted within thick 52 Kenko PL blank filter).
Results are not at all pleasing with total lack of infinity focus & overall softness seen from f2.8 through f8. Corners and color are improved with PCX but not significantly.
Do not know if this is due to the adapter sample I have. Any recommendations are welcome.
Heavy vignetting seen with the current setup(55-52mm step down ring & PCX rev mounted within thick 52 Kenko PL blank filter).
Results are not at all pleasing with total lack of infinity focus & overall softness seen from f2.8 through f8. Corners and color are improved with PCX but not significantly.
Do not know if this is due to the adapter sample I have. Any recommendations are welcome.
You can't use the same filter for the Sony system on the Nikon since you "overcompensated" for the problem. Lack of infinity and general softness can be tested without the filter to see if it's your adapter issue.
Definitely, the step down ring is causing the vignetting. Try to place the PCX lens without that step down filter plus extra 52mm filter and try to hold it in place with 55 -> 52 step down ring alone.
Nah, 1500 is probably still good. I used the 1500 on a 1.8mm modified Sony and it was better than the stock Sony. Nikon is 2.3mm, so it should be slightly better than the Sony with the 1500 but probably not material.
@lsds To mount the filter on the 21, as Vivek said, you'll want to put it inside the lenses filter threads, then use the 55>52 step down to hold it in (plus retainer if necessary, I forget.) You won't want to step it down, then mount it via a filter housing. Bit of a pain if you plan to use the PCX with other G's, best to get 2 PCX's, one for the 28 and one for the 21.
As to infinity... unscrew the front name plate. There are 4 small screws. Get a JIS screwdriver set. Remove the screws and the front optical block will fall out if you turn it over. There will be shims behind the block. Remove the shims, replace the block and I'll almost (ALMOST) guarantee you have infinity focus. Super easy to do.
hiepphotog wrote:
You can't use the same filter for the Sony system on the Nikon since you "overcompensated" for the problem. Lack of infinity and general softness can be tested without the filter to see if it's your adapter issue.
Mathieu18 wrote:
Nah, 1500 is probably still good. I used the 1500 on a 1.8mm modified Sony and it was better than the stock Sony. Nikon is 2.3mm, so it should be slightly better than the Sony with the 1500 but probably not material.
@lsds@ To mount the filter on the 21, as Vivek said, you'll want to put it inside the lenses filter threads, then use the 55>52 step down to hold it in (plus retainer if necessary, I forget.) You won't want to step it down, then mount it via a filter housing. Bit of a pain if you plan to use the PCX with other G's, best to get 2 PCX's, one for the 28 and one for the 21.
As to infinity... unscrew the front name plate. There are 4 small screws. Get a JIS screwdriver set. Remove the screws and the front optical block will fall out if you turn it over. There will be shims behind the block. Remove the shims, replace the block and I'll almost (ALMOST) guarantee you have infinity focus. Super easy to do.
Interesting since the front filter focal length was calculated using the thickness difference and other parameters. Well, I'm glad it doesn't matter as much then.
I think it was found that going any stronger basically induced too much midzone dip to be worth it. Since the Nikon is a bit (0.2mm) thinner, it should show slightly more midzone dip and more corner correction, but I'm guessing it'll be slightly (very slightly) better than stock Sony. Part of the confusion is the early, incorrect reports that Nikon was close to 1mm of stack, which didn't account for the final, epoxied layer.
hiepphotog wrote:
Interesting since the front filter focal length was calculated using the thickness difference and other parameters. Well, I'm glad it doesn't matter as much then.
Mathieu18 wrote:
I think it was found that going any stronger basically induced too much midzone dip to be worth it. Since the Nikon is a bit (0.2mm) thinner, it should show slightly more midzone dip and more corner correction, but I'm guessing it'll be slightly (very slightly) better than stock Sony. Part of the confusion is the early, incorrect reports that Nikon was close to 1mm of stack, which didn't account for the final, epoxied layer.
I don't believe the stock Nikon's stack is only 0.2mm thinner than the stock Sony's. Kolari doesn't measure the sensor's clear glass cover but the rest glass stack they do: Nikon - 1.1mm, Canon 1.6mm and Sony 2mm. Assuming the sensor's clear glass cover thickness is the same (~0.9-1mm), it's still 0.9mm difference, which would explain the M performance better IMO. 0.2mm is too small.
Sony- cover glass 0.7mm plus filter stack (everything else) 1.8mm = 2.5mm. I have glass+stacks from A7 to A7III.
hiepphotog wrote:
I don't believe the stock Nikon's stack is only 0.2mm thinner than the stock Sony's. Kolari doesn't measure the sensor's clear glass cover but the rest glass stack they do: Nikon - 1.1mm, Canon 1.6mm and Sony 2mm. Assuming the sensor's clear glass cover thickness is the same (~0.9-1mm), it's still 0.9mm difference, which would explain the M performance better IMO. 0.2mm is too small.
Yea like Vivek said. Sony 0.5mm shaker, 1.3mm hot mirror, 0.7mm epoxied. And the 1.3mm hot mirror layer is actually a sandwiched hot mirror and AA filter.
I got the Nikon number from a well known blogger that talks to Nikon. He PM’d it to me so I don’t know that he wants it attributed to him but I believe it’s good info. Also, I tried a Loxia 35 on that 1.8mm modifies A7RII and it was a total mess outside the center. It’s not bad at all on a Nikon, better in the corners actually, so there’s no way it’s even thinner than 1.8mm
hiepphotog wrote:
I don't believe the stock Nikon's stack is only 0.2mm thinner than the stock Sony's. Kolari doesn't measure the sensor's clear glass cover but the rest glass stack they do: Nikon - 1.1mm, Canon 1.6mm and Sony 2mm. Assuming the sensor's clear glass cover thickness is the same (~0.9-1mm), it's still 0.9mm difference, which would explain the M performance better IMO. 0.2mm is too small.
hiepphotog wrote:
You can't use the same filter for the Sony system on the Nikon since you "overcompensated" for the problem. Lack of infinity and general softness can be tested without the filter to see if it's your adapter issue.
PCX 1500 works well on the CG 28. Will be sharing results soon. Images on the right are without filter.
Mathieu18 wrote:
Nah, 1500 is probably still good. I used the 1500 on a 1.8mm modified Sony and it was better than the stock Sony. Nikon is 2.3mm, so it should be slightly better than the Sony with the 1500 but probably not material.
@lsds@@ To mount the filter on the 21, as Vivek said, you'll want to put it inside the lenses filter threads, then use the 55>52 step down to hold it in (plus retainer if necessary, I forget.) You won't want to step it down, then mount it via a filter housing. Bit of a pain if you plan to use the PCX with other G's, best to get 2 PCX's, one for the 28 and one for the 21.
As to infinity... unscrew the front name plate. There are 4 small screws. Get a JIS screwdriver set. Remove the screws and the front optical block will fall out if you turn it over. There will be shims behind the block. Remove the shims, replace the block and I'll almost (ALMOST) guarantee you have infinity focus. Super easy to do. ...Show more →
Thanks! Will try the shimming and thin ring today and post results . Cheers!
. But is the Nikon Z stack really 0.2mm thinner?