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09-30-2012, 09:15 AM   #16
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QuoteOriginally posted by boriscleto Quote
For the same reason the mount doesn't have an aperture coupling, cost. BTW, the K-5 has a 100% viewfinder, the MX was a 95% viewfinder. The best viewfinder Pentax made in the manual focus era was only 98%.

K-5 viewfinder:
0.92x, 100%

MX viewfinder:
0.97x, 95%

The K series all had 0.88x viewfinders, the A & P series had 0.82x viewfinders.
Rhetorical question, what does 100% mean in context of the aps-c sensor and 95% in the MX to the 24x36mm film?

09-30-2012, 11:12 AM   #17
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QuoteOriginally posted by Blue Quote
Rhetorical question, what does 100% mean in context of the aps-c sensor and 95% in the MX to the 24x36mm film?
Good point! People confuse viewfinder magnification with viewfinder coverage. The magnification normally means how the image compares to "life size" view with a normal lens. (However, with APS-C it often refers to magnification with a 50mm lens - so it sounds like the same 24x36 film cameras, when it should give magnification with a 35mm lens instead of 50mm. So manual focus on a K-5 with a 35mm lens is much less precise than a film MX with 50mm lens, even though the angles of view are similar.
I find magnification more of an issue with K-5 than coverage. The coverage (100% or 95%) refers to the amount of the recorded image that is viewable in the finder. On 35mm film there was typically a few % covered by a slide mount, so 100% finders showed more than the user would typically see when projecting slides, or what would be masked on the edges in an enlarger.
95% coverage is fine, if the image with a normal lens appears nearly life-size.
Rangefinder cameras like my Leica M9 nearly always record more than the "frame lines" in the finder indicate, just like most SLR finders captured more on film than indicated in the finder. But with digital who cares? You just crop slightly so your final image matches what you want.
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