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05-24-2010, 11:13 PM   #1
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Focussing.

Just getting back into screw mount again after a long absence. I've got a black Spotmatic 11 SMC 1.4, SMC 4.0 Macro, 300SMC F4, & just bought a 85/210 zoom.
Just wondering if anyone's got any focussing tips for me. I've no problem with the shorter lens, but using the longer lens, I seem to have a bit of a problem focussing with the "microprism" in the centre of the viewfinder....so I seem to revert to the full finder...which is probably not correct.
Anyone else have this problem, & if so, how do you focus?
Cheers, Pickles.

05-24-2010, 11:31 PM   #2
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There is nothing wrong with using the full finder. The microprism isn't as effective as a split screen would be, especially with a tele and when you're almost in focus. Your best bet IMO is just to shoot around F8 so that the DOF takes care of any minor inaccuracies.

Adam
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05-24-2010, 11:46 PM   #3
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QuoteOriginally posted by Adam Quote
... Your best bet IMO is just to shoot around F8 so that the DOF takes care of any minor inaccuracies.
Amen to that,

F8 and be there
&
F8 and forget it.

Also if your shutterspeed is too low that will sometimes get shake in the image which sometimes looks like bad focus.
05-25-2010, 11:15 AM   #4
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I got a KatzEye split-prism focusing screen a year after getting my first DSLR, and never found a reason to switch back. I recently got a new K-7, and have tried the stock screen for a while. It's OK, but I'm going to get another KatzEye screen. With the split-prism I'm faster, more accurate and have far less eye fatigue afterwards. With mostly manual focus lenses, I need it.

Drawbacks are cost - it would be cheaper if it was solid gold. The prism is in the center so you sometimes have to focus and recompose, and sometimes the viewfinder is cluttered. And spot metering becomes just finicky enough to be unreliable, at least a lot of trouble. Replacing the screen may also require some shimming for the best accuracy, and some fiddling depending on camera model.

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