About Focusing screens

johnc · 12-30-2014, 05:45 PM

Slower lenses (after around f4) have required sometimes very significant exposure compensation here with my K-3 and the EE-S screen. Mine has some small gridlines.

The effect is very significant at f5.6 (+2ev needed with the DA* 60-250 used in combination with the 1.4x HD TC resulting in f5.6, for example)

Your milage may of course vary. And I think it is not realistic to get a screen that looks great and works perfectly with no compensation for any lens. Canon for example recommend the EE-S for fast glass only from memory. I would also report that the K-3 stock screen/prism seems to me to be better for MF than the K-5 one. Though I don't have a K-5 here to make a direct comparison!

John

renix · 12-30-2014, 11:27 PM

Originally posted by johnc

Slower lenses (after around f4) have required sometimes very significant exposure compensation here with my K-3 and the EE-S screen. Mine has some small gridlines.

The effect is very significant at f5.6 (+2ev needed with the DA* 60-250 used in combination with the 1.4x HD TC resulting in f5.6, for example)

Your milage may of course vary. And I think it is not realistic to get a screen that looks great and works perfectly with no compensation for any lens. Canon for example recommend the EE-S for fast glass only from memory. I would also report that the K-3 stock screen/prism seems to me to be better for MF than the K-5 one. Though I don't have a K-5 here to make a direct comparison!

John

I think so... also! There is very significant exposure compensation with focusing screen different from K3 kit.. very very significant!

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12-30-2014, 05:45 PM	#16
johnc Veteran Member Join Date: Feb 2011 Location: United Kingdom Photos: Albums Posts: 735	Slower lenses (after around f4) have required sometimes very significant exposure compensation here with my K-3 and the EE-S screen. Mine has some small gridlines. The effect is very significant at f5.6 (+2ev needed with the DA* 60-250 used in combination with the 1.4x HD TC resulting in f5.6, for example) Your milage may of course vary. And I think it is not realistic to get a screen that looks great and works perfectly with no compensation for any lens. Canon for example recommend the EE-S for fast glass only from memory. I would also report that the K-3 stock screen/prism seems to me to be better for MF than the K-5 one. Though I don't have a K-5 here to make a direct comparison! John

12-30-2014, 11:27 PM	#17
renix Junior Member Join Date: May 2013 Location: rome Posts: 37 Original Poster	Originally posted by johnc Slower lenses (after around f4) have required sometimes very significant exposure compensation here with my K-3 and the EE-S screen. Mine has some small gridlines. The effect is very significant at f5.6 (+2ev needed with the DA* 60-250 used in combination with the 1.4x HD TC resulting in f5.6, for example) Your milage may of course vary. And I think it is not realistic to get a screen that looks great and works perfectly with no compensation for any lens. Canon for example recommend the EE-S for fast glass only from memory. I would also report that the K-3 stock screen/prism seems to me to be better for MF than the K-5 one. Though I don't have a K-5 here to make a direct comparison! John I think so... also! There is very significant exposure compensation with focusing screen different from K3 kit.. very very significant!