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03-25-2008, 12:16 PM   #1
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Playback Magnification?

New to K10D. The playback enlarges up to 20 times. How many times is 100 precent view? I looked in vain in the manual.

Thanks

03-25-2008, 01:32 PM   #2
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2 times is 100% enlargment.
03-25-2008, 01:57 PM   #3
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QuoteOriginally posted by GSk Quote
2 times is 100% enlargment.
what about the K100D? i inspect all photos at 12x to ensure sharpness :P
03-25-2008, 02:35 PM   #4
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QuoteOriginally posted by GSk Quote
2 times is 100% enlargment.
Hmmm, I think 100% is actually somewhere between 6x and 8x... Here's my reasoning:

The resolution of the K10D's LCD is approximately 530x396 (i.e. 210 000 pixels according to the specs), for a diagonal of 662). The 10MP image's resolution is 3872x2592, for a diagonal of 4648. Hence, the LCD is roughly 7x smaller than the image.

Now, the LCD's aspect ratio is 4:3 while the image's is 3:2, so the math is not exact, but the 7x is still in the correct ballpark, IMHO.

03-25-2008, 06:25 PM   #5
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Anyone else? I just don't want to overdo expecting pictures beyond reasonable.
03-26-2008, 02:37 AM   #6
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Some misunderstanding...

... maybe? K10D LCD is 320*240 (230 000 dots divided by 3 (RGB)) pixels and usable for viewing is 320*210 (3:2 aspect ratio) IMHO. So 1:1 magnification is at around 12x - but I may be wrong.

Best and happy viewing, JR

Last edited by Reps; 03-26-2008 at 02:38 AM. Reason: Addition
03-26-2008, 10:07 AM   #7
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The playback magnification seems to be more linked to the old film standards. One of the accepted dogmas was that for magazine publication, your slides needed to be crisp through an 8x loupe. A 4x loupe was good for rough editing, but the 8x was the "sharpness" standard.
03-26-2008, 12:35 PM   #8
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6.930481283422459893048128342246 (ish)

- Andrew

03-26-2008, 03:43 PM   #9
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QuoteOriginally posted by Reps Quote
... maybe? K10D LCD is 320*240 (230 000 dots divided by 3 (RGB)) pixels and usable for viewing is 320*210 (3:2 aspect ratio)
All the published specs I've seen say 210 000 *pixels*, not dots. Until I see definite evidence to the contrary, I'm not dividing anything by 3
03-26-2008, 06:45 PM   #10
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1:1 maginification ration measured

QuoteOriginally posted by RBellavance Quote
All the published specs I've seen say 210 000 *pixels*, not dots. Until I see definite evidence to the contrary, I'm not dividing anything by 3
Ok, I ended this discussion once and forever. Because I was curious myself.


Look here, my friend:
https://www.pentaxforums.com/forums/pentax-dslr-discussion/23741-measured-res...ck-screen.html

The exact 1:1 K20D magnification ratio therefore is:

3072 / 234 = 13.1 (or about 14x which is the closest factor being supported)

The "official" 1:1 zoom is 3072 / 240 = 12.8

Last edited by falconeye; 03-26-2008 at 06:51 PM.
03-27-2008, 03:46 AM   #11
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Good to know about the K20D... however I believe the topic was the K10D

- Andrew
03-27-2008, 05:43 AM   #12
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QuoteOriginally posted by RBellavance Quote
All the published specs I've seen say 210 000 *pixels*, not dots. Until I see definite evidence to the contrary, I'm not dividing anything by 3
Here's definite evidence to the contrary for you

Look for a Can*n Elph SD1000 (my wife has one). Its specs say 2.5" screen 230K pixels, the displayed pic is *significantly* more refined therefore K10D/K100D's LCD must be 210K dots (despite being muddied as pixels).

So I agree with Reps on 320x210 ===> K10D 1:1 is ~12X, K100D 1:1 is ~9X
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