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02-02-2008, 07:19 AM   #1
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My experience with ebay focusing screen...

Ugh.

Bought this, and it finally arrived yesterday:
Diagonal Split Image Focus Screen for Pentax DS K10D - (eBay.ca item 170183637896 end time 08-Jan-08 00:33:41 EST)

I don't have manual lenses, but I focus on a lot of dark items, in dark lighting, something that no AF system can compete with. A split prism seemed like the way to go, as I use split prism all the time on my manual cameras, medium format, etc.

Installing the screen is a breeze, and with a pair of tweezers, it's of no issue whatsoever.

Once installed, at first I thought there was a problem with my camera backfocusing, as it would autofocus, but be slightly off in the prism. So, I'd focus in manual mode, everything looked sharp, and then I'd snap a photo...

Until I compared them.

Honestly, no point in me uploading them and showing them to you, they're that bad. Camera was perfectly correct, it was me, when I thought it was in focus by the split prism, that was dead wrong. The shot taken with the assistance of the prism was a failure.


So this begs the question, is there a good way to do this? Or is the pricier Katz-eye the only way to go?

I should mention that autoexposure isn't an issue, as I only use manual mode and a light meter for the work I do.

02-02-2008, 11:24 AM   #2
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QuoteOriginally posted by FireMate Quote
Ugh.

Bought this, and it finally arrived yesterday:
Diagonal Split Image Focus Screen for Pentax DS K10D - (eBay.ca item 170183637896 end time 08-Jan-08 00:33:41 EST)

I don't have manual lenses, but I focus on a lot of dark items, in dark lighting, something that no AF system can compete with. A split prism seemed like the way to go, as I use split prism all the time on my manual cameras, medium format, etc.

Installing the screen is a breeze, and with a pair of tweezers, it's of no issue whatsoever.

Once installed, at first I thought there was a problem with my camera backfocusing, as it would autofocus, but be slightly off in the prism. So, I'd focus in manual mode, everything looked sharp, and then I'd snap a photo...

Until I compared them.

Honestly, no point in me uploading them and showing them to you, they're that bad. Camera was perfectly correct, it was me, when I thought it was in focus by the split prism, that was dead wrong. The shot taken with the assistance of the prism was a failure.


So this begs the question, is there a good way to do this? Or is the pricier Katz-eye the only way to go?

I should mention that autoexposure isn't an issue, as I only use manual mode and a light meter for the work I do.
my katz eye told me that autofocus was wrong 50% of the time of where i wanted it to be

then i just gave up and started shooting in manual mode 100% of the time, even with DA lenses, never looked back.

so i dont know what to say, my Katz eye exhibits the same characteristics as yours, but without all the negative stuff
02-02-2008, 01:55 PM   #3
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FireMate it sounds like you need to adjust your diopter. If the autofocus is accurate adjust the diopter so then the manual focus will be accurate as well.
02-02-2008, 02:40 PM   #4
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Have you installed the shim on the right side of the screen?

02-02-2008, 05:32 PM   #5
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Join Date: Mar 2007
Location: Ontario, Canada
Posts: 105
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QuoteOriginally posted by Gimbal Quote
Have you installed the shim on the right side of the screen?
Yeah, that seemed to be the problem, I didn't notice it had come with the shim. Someone on ... the other forum... mentioned it.

I put the shim above the screen, and now it seems to work!
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