LongLensPhotography
Th..th..that's all folks!
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1. Do you clearly see aperture move between all stops looking from both sides of the lens? And particularly from the rear roughly where the sensor would sit.I know T at f are different as I've been at this over 50 years now but that's not all that's going on here as regardless of transmission and exposure settings the depth of field in pictures taken with different 35mm lenses should be similar at the same aperture settings. When pictures are taken at the same distance the diameter of the physical aperture at each f stop affects the depth of field and this is a fundamental thing. If all I was seeing was a difference in transmission / exposure the depth of filed could be expected to still be similar at the same f settings and it isn't. This piques my interest and I wonder why it seems to be so far out and I suppose there are just a number of possible explanations, either it's sloppily made, components are out of spec or someone is being less than honest, or a combination or all of that.
As for why I'd use the Pergear ahead of other lenses I have, it's much much smaller and much lighter than any other 35mm f1.x I have and for me that could be reason enough although the cost could well come into it as well. If it is indeed effectively a f2.x lens then my Sony 35mm f2.8 then becomes stiff competition for it but the Pergear is believe it or not the more enjoyable lens to use as it's an old style metal lens with an aperture ring and distance markings and it is very tactile and just a joy to use compared to the soulless AF lenses of today.
2. When you say the DOF doesn't change, have you checked it both ways on a graded scale? There are focus shifts... and sometimes very dramatic going from wide open to one stop down.
3. This lens appears to annoy you enough despite of all the "positives" and this is where I draw the line for gear that does this. For a peace of mind ebay listing would be opened as soon as the next listing offer comes through. Alternatively, you just need to accept this behaviour as an intricate part of the product.