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03-21-2014, 09:18 PM   #1
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SF1 vs. SF1n differences?

I recently acquired up a SF1 in a camera/lens bundle and I already have a SF1n. What's the difference between the two models? As far as I can tell they seem nearly identical except for the mirror pattern and the flash sync speed.

Thanks!

03-21-2014, 11:03 PM   #2
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You've about summed it up. The difference between the 2 models is tiny

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03-22-2014, 03:00 AM   #3
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as I read from the database here, max shutter speed seems to be different, 1/2000 vs 1/4000 for SF1n.
03-22-2014, 03:03 AM   #4
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Hi Boris, what exactly do you mean by mirror pattern? I just recently aquired a nice SFX, so I would be interested to know...

03-23-2014, 01:02 AM   #5
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This is what the SF1 mirror looks like. Now I gotta know what the SF1n mirror looks like.
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03-23-2014, 08:11 AM   #6
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woah, thats a crazy pattern, are they all like that?

whats the thought behind making it like that?
03-23-2014, 08:42 AM   #7
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The mirror in the SF1n is just a plain mirror. There is no pattern.

I would also like to know what the thinking was behind the pattern. Maybe that is the area where light passes through to the AF sensor. If that's true then maybe they did that because translucent mirror technology wasn't fully developed yet.
03-23-2014, 01:32 PM   #8
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My guess is that each individual segment is a different metering point. More segments toward the center seems to be consistent with center-weighted metering.

03-23-2014, 03:08 PM   #9
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The SFXn (SF1n) also had auto-bracketing (where the SFX has 'RFT flash' on the pop-up flash, the SFXn has 'Auto-bracketing' logos).
04-06-2014, 07:53 PM   #10
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QuoteOriginally posted by 6BQ5 Quote
The mirror in the SF1n is just a plain mirror. There is no pattern.

I would also like to know what the thinking was behind the pattern. Maybe that is the area where light passes through to the AF sensor. If that's true then maybe they did that because translucent mirror technology wasn't fully developed yet.
I've checked this in the past with Pentax customer service in Germany and was told, the pattern was to control build accuracy for the new AF cameras (to minimize tolerances adn to achieve proper focus. They obviously had a front or back focus problem on their minds as early as 1987!).

But soon it turned out that the AF system was working precisely, and later SF1 series and the SF1n do already have a plain main mirror without grid. The AF sensor itself uses only the small secondary mirror.

My experience with 6 SF1/SF1n bodies is that the SF1n is more robust - all my SF1 have a dead solenoid for aperture control in A mode by now (doesn't matter, I swapped the screens for ZX-M split screens and use them with lenses before A).
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