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Thread started 30 Aug 2012 (Thursday) 16:43
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Manual focus screens

 
sdblade
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Aug 30, 2012 16:43 |  #1

Having read many threads about this subject I am still none the wiser with regards to manual focussing screens. I use a variety of old lenses ranging from f/1.8 to f/4 and I sometimes have a hard time focussing via the standard veiwfinder in my 60D. I want to purchase a second screen to aid focussing but I'm unsure which to go for. Several seem to be just for alignment as the have grid lines etched on them. Others seem to be focussing aids but only work with f2.8 or faster and become darker with smaller apetures. I know I can get a split prism focussing screen for $100 or so but I was wondering if anyone out there in POTNland had the same issue and could recommend which screen may solve my problems. All input is welcome.

Thanks in advance.............




  
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Wilt
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Aug 30, 2012 17:40 |  #2

Realize first that focusing screens in dSLRs is deliberately brighter, due to the light which is lost when it is diverted to the AF sensor instead of up to your eye.

Realize also that focusing screens like Ex-S are 'coarser' in texture than the standard screen, so that they are more precise in displaying focus and work well with faster lenses like f/2.8, but appear to be darker for slower lenses like f/5.6 because of the light which is still diverted to the AF sensor

Also realize that aftermarket screens with focusing aids in the center help with focus, but at the expense of introducing metering error (up to 3EV error) especially in Spot metering mode; while Canon accesory screens have CFn settings to alleviate metering error, aftermarket screens do NOT have a suitable CFn setting.


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Aug 30, 2012 18:29 |  #3

I find the best focus screen for manual lenses is the big 3" rear LCD when you use Liveview combined with 5x or 10x magnification.

It works best with a tripod, but you can get good results when hand holding.


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sdblade
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Aug 31, 2012 13:35 as a reply to  @ msowsun's post |  #4

Thanks for the responses. Looks like I'll have to order a couple and try them out.




  
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luciddreamer
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Aug 31, 2012 17:40 |  #5

msowsun wrote in post #14928220 (external link)
I find the best focus screen for manual lenses is the big 3" rear LCD when you use Liveview combined with 5x or 10x magnification.

It works best with a tripod, but you can get good results when hand holding.


That works great with a static subject. If you're a birder or something similar it usually isn't feasible. As for replacement screens, like the OP said, they're really only good for fast lenses. Since my Leica isn't exactly fast... I just live with the standard Canon screen.


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Manual focus screens
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