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01-03-2012, 11:55 PM   #1
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K10D & K20D Metering problems

K10D and K20D are known for inconsistent metering when shooting with MF lenses, then are their successors, K-7 and K-5 any better in metering with MF lenses? I shoot almost exclusively with MF lenses and some lenses are just all over the place with inconsistent metering on the K20D.

Thanks,

01-04-2012, 12:49 AM   #2
dms
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If you look at other posts you will see the istd screen fixes this problem. I use one (w/ a K20d) and have no problem with any of the half dozen mf lenses that I use regularly--and thus I would have noticed a problem if it was significant. I have used it for 3 years and about 20,000 exposures.
01-04-2012, 12:52 AM   #3
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BTW from my understanding the K7 and K5 will have a problem--unless you go to a 3rd party screen. But hopefully you will get first hand input.
01-04-2012, 01:02 AM   #4
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QuoteOriginally posted by dms Quote
If you look at other posts you will see the istd screen fixes this problem. I use one (w/ a K20d) and have no problem with any of the half dozen mf lenses that I use regularly--and thus I would have noticed a problem if it was significant. I have used it for 3 years and about 20,000 exposures.
Are you talking about spot metering problems with split prism screens that gets fixed by using istD screen? I already have that but what I am talking about is that on certain lenses, the exposure value fluctuate wildly when the aperture is closed down one stop at a time, where ideally, one should see a proportional increase in the shutter speed to compensate for the smaller aperture settings.

01-04-2012, 01:11 AM   #5
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No, using weighted average or spot, the istd screen results in uniform stop-to-stop correct exposure times. Close down 1 stop and exp time doubles, etc. I think my screen is LL60 (happens to have grid lines, but that's immaterial)--if you want to do a search on it's use for this problem
01-04-2012, 01:19 AM   #6
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I did a quick look for one of the posts. Here is one. pentaxforums.com/forums/241716-post69.html
01-04-2012, 01:52 AM   #7
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The K7/K5 indeed behave better than the K10/K20 (had all of them and used them with old lenses, so I'm pretty sure of what I say), but, as with the LL-60 / K10 combo, they are still a little way off...
In both cases (K7/5 and K10/20+LL60), you'll see a -0.5 underexposure with fast lenses, and as much as a +1 overexposure stopped down to f/11-16 (which is a big improvement over the usual -1.5/+3 behavior of the K10/k20)...

Now, using a Canon EE-S screen (available already cut at FocusingScreen), you'll get true linear metering (along with true DoF rendering below f/2!). A pure joy to use!
01-04-2012, 05:45 AM   #8
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See this thread, it shows *istD, several K10D variants and the K7D. I should update it with my K5D but.....


https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/124627-k-5-met...ml#post1292191

01-04-2012, 01:31 PM   #9
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I have been reading about the Canon EE-S screen results with some interest, I wonder how it would affect a K20D but I am reluctant to pour anymore money into yet another focus screen for the K20D seeing as I've already got a KatzEye split prism and a Pentax LL-60 focus screen for it. LL-60 seemed to have less variation in the exposure but I don't think it's quite as linear as dms stated, I'll have to run some tests myself to see if I can confirm his results or not. I was hoping that a K-7 or K-5 had somewhat rectified this non-linear exposure problems inherent to the K10D and K20D. Thanks all for your replies.
01-04-2012, 01:51 PM   #10
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based upon my tests the LL60 screen out of the *istD will be the same as the K10D, resulting in a rise of about +1 Stop, between F2 and F22, and with this if you set a -1/2 stop exposure compensation, you will be between +/- 1/2 stop over the whole range. That is as good as it gets.

the K5 from data I have seen behaves the same way, therefore it is another option, but no solution is perfect.

the only way to get perfect i.e. flat metering is with A series lenses, because the camera compensates for the open aperture metering error.
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