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04-20-2012, 06:41 AM   #1
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Magnified Live View With DA vs. A Lenses

The other day, I was playing with my K-5 and my newest acquisition, the DA 18-135mm lens.

I then discovered that with AF on, I could only get a magnification up to 6X in live view. I consulted the manual and noted that this was indeed "text-book performance".

However, when I use the AF setting on my K-5 with an A-lens (for Catch-in-Focus) i can have up to a 10X magnification in Live View.

I am not complaining, just curious: What makes the difference?

04-20-2012, 06:52 AM   #2
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Given that its an electronic enlargement it would seem that its simply a firmware choice that Pentax made. No idea why they would have a different magnification under those two conditions though, seems it would require more lines of code to make it different than to have one process for all lenses.
04-21-2012, 08:29 AM   #3
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The DA lenses can be used for contrast AF. Maybe 6x magnification plus contrast AF is the maximum enlargement that makes sense - besides chance.
04-21-2012, 10:29 AM   #4
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You can zoom in more when focusing manually, I guess they figured you don't need that kind of zoom when using the auto focus.

04-21-2012, 03:34 PM   #5
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Past 6x in LV AF the focus area gets bigger than the LCD.
04-23-2012, 05:26 AM   #6
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Thanksto all for comments and suggestions.

I tend to believe that Docwrm is pointing in the right direction about this being a firmware issue. It implies that it is the camera's regognition of the lens rather than the use of the AF function itself that is the determining factor. Well, anyway, I am happy with the "generous" 8X and 10X magnification for critical focusing with MF lenses in astro- and close-up/macrophotography.
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