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Hi All,
Just wanted to report on the split prism focus screen that I just recievd today.
I blew $30.00 on this one:
Split Image Focus Screen for Pentax DL K100D - (item 140146268760 end time Aug-15-07 18:36:19 PDT)
Apparently, the K1000 screen @ 1.35mm compared to 1.42mm does make a difference even though the seller makes a claim as if this is better or something.
Anyway, the package arrived and after dinner I paitiently went through the steps to install it in my K100D.
Cons:
1) After taking it out of the SD memory card like case then working it carefully out of the miniature zip lock bag I discovered that it was wrapped in some kind of tape. This tape is what is shown in the picture at the link above. I was thinking it was an optical tape to keep it clean and to pull dust off in case there was any. Needless to say it was a pain in the $%@#%!^ to get off of the screen.
2) I used a bulb blower on it before putting it in only to discover a huge hair galloping across the center on the screen when first looking through the view finder. After several removals....installs....removals...etc. I gave up and ran it under luke warm tap water and blotted it dry with a lens cloth. This at least got the hair off of it but I could still see a few small dust particles which I figured I'd have to live with.
3) Starter taking pictures. Interesting results. Back focusing. Inorder not to jump to any quick conclusions, I set up my tripod and did the 3 in a diagonal row battery test using an SMC-A 50 1.7 @ f5.6 (I did this so I could compare results with my kit lens at 50mm if need be). Sure enough, when manually focusing with the split the center battery was soft and rear battery was coming into focus. Then I used the focus assist to lock in a green hex. Perfect results!
These were taken at f5.6 so you can imaging what it would look like at f2.8 and below!!
Pros:
1) Screen is as bright and clear as the OEM screen.
2) Matte circle gives good indication of when your close to focus.
3) No blacking out at higher f stops which has been reported before. Split circle stays clear on both sides throughout f range.
4) Focus assist compatable. In fact, the focus circle is slightly above the center red focus square which is less distracting than if they had lined up.
Conclusions: This screen is pretty useless for the reason I bought it. I tried removing the copper shim which made it rear focus even worse then turned it around which gave the same or worse results. I may try the shimming it out .07mm if I can come up with a slick method and material for fabricating one and if it will fit under the sheet metal clamp. I'll report it here if it helps. I have not run the full exposure tests at all f's and probably won't unless the shim works.
What a shame. I was really hoping that this would help with focusing my manual primes a low f. Oh well, you roll the dice and move your mice............
My wallet was the only thing hurt.
See Ya,
Chuck