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04-13-2013, 03:09 AM   #1
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If you build a 36x24, put in a real viewfinder which nobody has yet

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Last edited by beholder3; 08-11-2013 at 06:39 AM. Reason: [deleted]
04-13-2013, 03:43 AM   #2
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wow differences are huge.
04-13-2013, 03:47 AM - 1 Like   #3
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QuoteOriginally posted by beholder3 Quote
Just look at Pentax LX
Tell me about it, I've always missed my LX view on life.

Interchangeable for various specialised applications too.

https://www.pentaxforums.com/forums/attachments/lens-clubs/167350d1365504449-club-goldenlx.jpg
04-13-2013, 12:03 PM   #4
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uff.. good point

04-13-2013, 02:07 PM   #5
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This issue is readily apparent to those of us that use a mix of digital and film SLRs. With the better manual-focus film cameras, the viewfinder is like looking through a window and a big one at that. Looking at the chart, one has to wonder why there is a downward trend in viewfinder magnification with the advent of AF cameras in general.

Steve

Last edited by stevebrot; 04-13-2013 at 02:14 PM.
04-13-2013, 02:17 PM   #6
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04-13-2013, 03:38 PM   #7
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With AF the viewfinder is used for composition, not focus, so they don't see the need for an easy-to-focus viewfinder for us manual dinosaurs. They see live-view as the future.
04-13-2013, 04:52 PM   #8
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QuoteOriginally posted by beholder3 Quote
Maybe because pre AF the metering sensor sat where now the AF sensor is. The metering sensor moved upwards to the prism dome.
Nah...very few manual focus film cameras metered through a half-silvered main mirror. The sensors on most TTL metered SLRs flanked the viewfinder and measured light off the focus screen.

You may be on to something though in regards to the mirror. AF cameras deliver significantly less light to the focus screen. Might it be that the lower magnification provides in some way for greater apparent brightness? This is just a guess. Focus screen and viewfinder theory represents sort of a black art to me.


Steve

04-13-2013, 10:51 PM   #9
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This is why I still use a *ist DS. Its the cheapest camera with a pentaprism. I wanted to buy a Kx/Kr but the pentamirror turned me away with all the manual glass I have. At least the K30 is a step in the right direction.
04-14-2013, 01:17 AM   #10
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04-14-2013, 02:22 AM   #11
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QuoteOriginally posted by stevebrot Quote
Nah...very few manual focus film cameras metered through a half-silvered main mirror. The sensors on most TTL metered SLRs flanked the viewfinder and measured light off the focus screen.

<SNIP>
Hmm...

As far as I recall, a fair amount of film SLRs measured off-the-film during exposure (notably for dealing with changing conditions such as other people's flash etc), and so must have exposure meeter cells pointed towards the film and not on the focus screen.

At least, that was the case of the OM2n, OM2s/p, OM3(T(i)) and OM4(T(i)) - which I used during the film-non-AF period. These had a half-silvered mirror (&, IIRC, a second mirror bouncing the light down on the cell sitting in front and pointing towards the film plane.

I do not remember that the OM viewfinders were anything but extremely bright

Of course, I do not know - I spent more time taking pictures than pondering what other cameras of other makes did - but I'd have guessed that that'd have been a fairly common configuration?

Now that I come to think of it, I actually do not know how the MZ-S does this, time to do some investigations....
04-14-2013, 08:02 AM   #12
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AFAIK only Pentax LX and the Olympus OM system has OTF metering. The others have the meter in the prism housing. That's maybe the biggest advantage with LX compared to the other systems with interchangable finders (Nikon F3, Canon F-1). With LX you get metered exposure with any finder. With the others you don't.
04-14-2013, 08:11 AM   #13
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QuoteOriginally posted by deus ursus Quote
Pentax LX and the Olympus OM system has OTF metering
Both technically away ahead of there time.

The LX also it worked really well on long exposures, the light meter goes all the way down to -6.5 ev that makes 125 seconds at 100 ASA @ F1.2, but I'm sure it went longer if it needed too.
04-14-2013, 09:19 AM   #14
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QuoteOriginally posted by kerrowdown Quote
...the light meter goes all the way down to -6.5 ev...
The actual sensitivity of the LX meter is much more ordinary. The oft-quoted -6.5 EV is the effective lower range in Av mode using exposure-time OTF (accumulation) metering. The base meter range (as evidenced in the spec for M mode) is a perfectly respectable 1 EV(100) to 19 EV(100).

I have always thought it strange that Pentax drew the the lower limit at -6.5 EV for Av mode since a lower value should be possible. Anyone done an exposure with an LX at less than -6.5 EV?


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04-14-2013, 02:51 PM   #15
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One thing that I've wondered a lot about: How come the finder coverage on most of those analogue cameras were less than 100 %? Even on professional cameras like Pentax LX and Olympus OM1 the coverage was 96 % and 97 % respectively. I'm sure there is no advantage not seeing the whole picture when you're photographing, or is it something I've missed?
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