First I'd like to say that I'm the FIRST person to point out the Brevis' right frame side being soft. I'm now saying, after experiencing a drastic decrease in edge to edge sharpness with the Letus EX and Redrock M2 in the same day using the same lenses that the Brevis is not the only adapter suffering from the misfortune.
To a degree, I'm sure the adapter can take responsibility but with two different adapters with the same set of PL Mount Zeiss T2.1 lenses I've experienced this on a lit set in ONE day. Matty_G termed it PORTHOLING and I have to agree with the terming.
Tim Naylor has been having extreme issues (I see it now!) with his lenses. He notices it more on his LetusEX than he does on his SGpro, but it's still there nonetheless. I haven't noticed it until now, and the difference between now and then is souly the glass I have been using.
I'm going to test this further tonight, and compare footage and also have stills between tonight and tomorrow of the image area through the adapter. The Vivitar 35mm and Nikon 17-35mm I've been using both exhibit minimal (if any at all) edge softening. I know that Zeiss Cine Glass must be manufactured much better (of course) than the glass I own, I'm sure the lenses are great on the camera's that they're meant for. However, I think the size of the iris is directly effecting how these lenses are used on our adapters.
The 32mm Zeiss Standard Speed Lense's iris/glass is about the size of a quarter.
The 35mm Vivitar and 17-35mm Nikon are both twice and three times as large.
It's a hairbrained theory, I'm probably wrong, but having a larger Iris is probably allowing a usage of a larger portion of the glass that's the "strongest" or, sharpest and most-even.
Anyone wanna try this out? Strap a lens that softens at the edges onto your adapter, zoom out til we see the inside of the adapter and check for a hot spot. See how small/large it is. Then compare the size of a lens that doesn't.
More pictures/video to come.
To a degree, I'm sure the adapter can take responsibility but with two different adapters with the same set of PL Mount Zeiss T2.1 lenses I've experienced this on a lit set in ONE day. Matty_G termed it PORTHOLING and I have to agree with the terming.
Tim Naylor has been having extreme issues (I see it now!) with his lenses. He notices it more on his LetusEX than he does on his SGpro, but it's still there nonetheless. I haven't noticed it until now, and the difference between now and then is souly the glass I have been using.
I'm going to test this further tonight, and compare footage and also have stills between tonight and tomorrow of the image area through the adapter. The Vivitar 35mm and Nikon 17-35mm I've been using both exhibit minimal (if any at all) edge softening. I know that Zeiss Cine Glass must be manufactured much better (of course) than the glass I own, I'm sure the lenses are great on the camera's that they're meant for. However, I think the size of the iris is directly effecting how these lenses are used on our adapters.
The 32mm Zeiss Standard Speed Lense's iris/glass is about the size of a quarter.
The 35mm Vivitar and 17-35mm Nikon are both twice and three times as large.
It's a hairbrained theory, I'm probably wrong, but having a larger Iris is probably allowing a usage of a larger portion of the glass that's the "strongest" or, sharpest and most-even.
Anyone wanna try this out? Strap a lens that softens at the edges onto your adapter, zoom out til we see the inside of the adapter and check for a hot spot. See how small/large it is. Then compare the size of a lens that doesn't.
More pictures/video to come.
