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Manual Focussing Screens
- Thread starter deshojo
- Start date
The screen is amazing, and it has the further advantage of being able to focus on off center subjects AND there's no black-out you get with micro-prisms when you stop down or are using a longer lens.
Since you have tried 2 screens, then the culprit could be your adapter. Further suspicion of this is that when you mount Canon lenses on the camera with the regular screen all is well. Now, were I you, I'd try the new screen but use a fast Canon lens that needs no adapter.
Here's the adapter I use with the 85/1.2 ... also shot with the 5D and Zeiss 60 macro focussing on the red dot ... sharp as a tack ... love this screen !!!!
Since you have tried 2 screens, then the culprit could be your adapter. Further suspicion of this is that when you mount Canon lenses on the camera with the regular screen all is well. Now, were I you, I'd try the new screen but use a fast Canon lens that needs no adapter.
Here's the adapter I use with the 85/1.2 ... also shot with the 5D and Zeiss 60 macro focussing on the red dot ... sharp as a tack ... love this screen !!!!
Thanks for taking the trouble to do those shots Marc, there's certainly no arguing with the accuracy of focus there.
I have tried this afternoon with an alternative adapter and results are the same. I have also tried both screens with a Canon 300mm f2.8 with and without 2x extender, and the 70-200mm f2.8 (manually focussing) and the focus on the screen is precise, as are the photos.
It's not that I can't see a precise point of focus in the viewfinder, I can, and I can see that it is much more precise and narrow than the standard screen. It's just that the final photo is not focussed where the viewfinder indicates, it's always slightly behind like the ex&le on the Canon box above.
Theoretically the screen should be the exact same distance from the lens as the sensor is, so if the object is focussed on the screen it's focussed on the sensor. This is the case with Ee-a with all lenses, and with the Ee-s with the canon lenses, it's just the Zeiss/Ee-s combination that's out.
I have another adapter on the way to me from DVD Technik, so I'll try that when it arrives. In the meantime I suppose it's just lucky that I seem to be able to focus pretty accurately with the standard screen. I'll keep racking my brains though, I hate to be intellectually defeated by an inanimate object!
I have tried this afternoon with an alternative adapter and results are the same. I have also tried both screens with a Canon 300mm f2.8 with and without 2x extender, and the 70-200mm f2.8 (manually focussing) and the focus on the screen is precise, as are the photos.
It's not that I can't see a precise point of focus in the viewfinder, I can, and I can see that it is much more precise and narrow than the standard screen. It's just that the final photo is not focussed where the viewfinder indicates, it's always slightly behind like the ex&le on the Canon box above.
Theoretically the screen should be the exact same distance from the lens as the sensor is, so if the object is focussed on the screen it's focussed on the sensor. This is the case with Ee-a with all lenses, and with the Ee-s with the canon lenses, it's just the Zeiss/Ee-s combination that's out.
I have another adapter on the way to me from DVD Technik, so I'll try that when it arrives. In the meantime I suppose it's just lucky that I seem to be able to focus pretty accurately with the standard screen. I'll keep racking my brains though, I hate to be intellectually defeated by an inanimate object!
I've tested the 85/1.2, 100/2.8 makro and 135/2 (as they're the ones with the smallest DOF), and they are all out by the same margin.
It's only really noticeable at very close distances wide open, where of course the DOF is tiny, but it still doesn't make sense that it appears focussed in the viewfinder.
If both screens were the same then I would say maybe it was a fault with the screen holder, but the standard screen is fine!
It just shouldn't be technically possible.
Maybe I'll try tomorrow in good light with the 100-300 and 70-210, and see what they produce at maximum focal length and minimum focus.
Every theory I come up with is contradicted by the fact that the standard screen works perfectly with all lenses, and the canon lenses work perfectly with the ee-s screen.
It's only really noticeable at very close distances wide open, where of course the DOF is tiny, but it still doesn't make sense that it appears focussed in the viewfinder.
If both screens were the same then I would say maybe it was a fault with the screen holder, but the standard screen is fine!
It just shouldn't be technically possible.
Maybe I'll try tomorrow in good light with the 100-300 and 70-210, and see what they produce at maximum focal length and minimum focus.
Every theory I come up with is contradicted by the fact that the standard screen works perfectly with all lenses, and the canon lenses work perfectly with the ee-s screen.
D
djg
Yes, you need a Contax to EOS adapter, and no, unfortunately it is not the 21mm Biogon but the 21mm Distagon, which in excellent condition should run you upwards of $2500 if you're lucky to find one. Keep an eye on the Fred Miranda Buy/Sell forum or eBay.