split-image focusing screen: Huge Difference on K20D and K10D

metalmania · 07-30-2011, 04:09 PM

I used to have the Jingfinance splict-image screen installed on a K10D. It worked well as expected. The lower half gets dark after f/5.6 under low light. Outside in the daylight, there is no darkness even at f/16.

Well today I put the screen in my K20D. WTH, I couldn't believe my eyes. The screen is ALWAYS BRIGHT even at f/16 under low light condition. This never happened before. I changed several lenses and tested both indoor and outdoor. It's just like that.

Now I can happily take the K20D with Sigma mini-wide II anywhere. Well I just don't know how to explain it.

JeffJS · 07-30-2011, 06:23 PM

Originally posted by metalmania

I used to have the Jingfinance splict-image screen installed on a K10D. It worked well as expected. The lower half gets dark after f/5.6 under low light. Outside in the daylight, there is no darkness even at f/16.

Well today I put the screen in my K20D. WTH, I couldn't believe my eyes. The screen is ALWAYS BRIGHT even at f/16 under low light condition. This never happened before. I changed several lenses and tested both indoor and outdoor. It's just like that.

Now I can happily take the K20D with Sigma mini-wide II anywhere. Well I just don't know how to explain it.

Sometimes it's best just not to question things. Just be glad they work

v5planet · 07-30-2011, 07:56 PM

Originally posted by metalmania

I used to have the Jingfinance splict-image screen installed on a K10D. It worked well as expected. The lower half gets dark after f/5.6 under low light. Outside in the daylight, there is no darkness even at f/16.

Well today I put the screen in my K20D. WTH, I couldn't believe my eyes. The screen is ALWAYS BRIGHT even at f/16 under low light condition. This never happened before. I changed several lenses and tested both indoor and outdoor. It's just like that.

Now I can happily take the K20D with Sigma mini-wide II anywhere. Well I just don't know how to explain it.

Well, since the lenses and the screen are the same, the only explanation that I can think of is that the K10 loses more light between those two points than the K20. Mirror? Prism box?

07-30-2011, 04:09 PM	#1
metalmania Senior Member Join Date: Feb 2011 Posts: 253	split-image focusing screen: Huge Difference on K20D and K10D I used to have the Jingfinance splict-image screen installed on a K10D. It worked well as expected. The lower half gets dark after f/5.6 under low light. Outside in the daylight, there is no darkness even at f/16. Well today I put the screen in my K20D. WTH, I couldn't believe my eyes. The screen is ALWAYS BRIGHT even at f/16 under low light condition. This never happened before. I changed several lenses and tested both indoor and outdoor. It's just like that. Now I can happily take the K20D with Sigma mini-wide II anywhere. Well I just don't know how to explain it.

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07-30-2011, 06:23 PM	#2
JeffJS Inactive Account Join Date: Aug 2008 Location: Michigan, USA Photos: Gallery \| Albums Posts: 7,484	Originally posted by metalmania I used to have the Jingfinance splict-image screen installed on a K10D. It worked well as expected. The lower half gets dark after f/5.6 under low light. Outside in the daylight, there is no darkness even at f/16. Well today I put the screen in my K20D. WTH, I couldn't believe my eyes. The screen is ALWAYS BRIGHT even at f/16 under low light condition. This never happened before. I changed several lenses and tested both indoor and outdoor. It's just like that. Now I can happily take the K20D with Sigma mini-wide II anywhere. Well I just don't know how to explain it. Sometimes it's best just not to question things. Just be glad they work

07-30-2011, 07:56 PM	#3
v5planet Veteran Member Join Date: Jan 2010 Location: Seattle Photos: Albums Posts: 1,915	Originally posted by metalmania I used to have the Jingfinance splict-image screen installed on a K10D. It worked well as expected. The lower half gets dark after f/5.6 under low light. Outside in the daylight, there is no darkness even at f/16. Well today I put the screen in my K20D. WTH, I couldn't believe my eyes. The screen is ALWAYS BRIGHT even at f/16 under low light condition. This never happened before. I changed several lenses and tested both indoor and outdoor. It's just like that. Now I can happily take the K20D with Sigma mini-wide II anywhere. Well I just don't know how to explain it. Well, since the lenses and the screen are the same, the only explanation that I can think of is that the K10 loses more light between those two points than the K20. Mirror? Prism box?