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12-06-2008, 12:23 PM   #1
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Judging sharpness on the K10D LCD

Has anyone developed a good rule of thumb of what magnification a shot needs to look sharp on the LCD to lood good when printed at 100% crop?

Most of my shots look good on in the initial full preview. None of my shots look good if I magnify all the way to 20x on the LCD. I'm trying to understand what I should use as a good gague of the sharpness.

Hopefully not 20x

12-06-2008, 01:53 PM   #2
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I focus carefully because the review screens aren't much good for focus reviewing.
To answer your question directly, use the viewfinder for focusing, and the review screen for....
hmmmmmm, setting up the camera menus?
12-06-2008, 02:17 PM   #3
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Wheatfield, I didn't see that one coming a great reply.
12-06-2008, 05:19 PM   #4
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I agree with Wheatfield, to a degree, or should I say X factor? lol

If you go to 12x and it's completely out of focus, it's probably not saveable nor usable. I don't think I've ever relied on 20x to tell me much except maybe read print on a far-away sign

How I see it is this way: The LCD screen only has 210,000 pixels. That's about 560x375. At 20x, you're practically pixel-peepin

12-07-2008, 04:58 AM   #5

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I want it fairly sharp at x16. But I BELIEVE the preview is of the empedded jpeg and thus will never look as sharp as the actual raw-image when "developed" on the computer.
12-07-2008, 05:11 AM   #6
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Well, the best way to judge sharpness is at 100% or 1:1 which on the K10d would be 6.9x. I don't know if that's an available zoom ratio or not, but on the K200d which has a little bigger screen, the 1:1 magnification is 6.7x and that is an available zoom factor.

12-07-2008, 05:26 AM   #7
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i use 4X

its a rough estimate of how its going to turn out (usually better than what i see on the LCD screen)

but its not so much sharpness that you're worried about, its in-focus-ness and amount of motion blur.
12-07-2008, 06:18 AM   #8
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I use 5 or 6 times magnification to judge sharpness, which usually works well.

12-07-2008, 09:37 AM   #9
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I've never been able to use it properly...the problem I have is when you miss the focus point. You look at something that should be in focus on the LCD, then you download it to your computer and some other point is in focus :-(
12-10-2008, 08:12 PM   #10
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I can't answer your exact question, but I learned from the Magic Lantern book on the K10 that many situations work best with sharpness bumped up 2 notches via the camera menu (portraits could be an exception). Doing that made me much happier with my average pictures, assuming I focused somewhere near the right place and had the right depth of field (I'm glad I'm not burning through film the way I used to- I could never afford it). I have no idea what actual process is going on by increasing the sharpness (is it "real" sharpness?) but I'm happy, so... I'm not going to worry about it, though I'll gladly listen if someone wants to tell me.

If you have trouble with the viewfinder, I presume you could use one of the magnifier attachments (loupes) for the viewfinder itself, though I've never tried any of them.

I hope this was a useful comment or two. Best wishes.
12-10-2008, 08:40 PM   #11
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QuoteOriginally posted by the_int21h Quote
Well, the best way to judge sharpness is at 100% or 1:1 which on the K10d would be 6.9x. I don't know if that's an available zoom ratio or not, but on the K200d which has a little bigger screen, the 1:1 magnification is 6.7x and that is an available zoom factor.

On the K10, one can set the initial zoom at 8X, which i've used on occasion to check on sharpness in the field. Thats pretty close to 7X
12-11-2008, 12:20 AM   #12
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Well for fun and late night curiosity I just did a test. Took a shot and downloaded it, then cropped it until a 1:1 view on my monitor matched up with the K20D LCD display when viewed side-by-side. x19 is as close as it gets to a perfect match. My "highly calibrated" eyeball says x16 isn't enough zoom for 1:1 peeping and x19 is just ever so slightly too much but closer than x16.

In practice though, I just use x4 as the first click (thanks to a chimp tip from Gooshin several months back) FWIW - x11 is usually plenty zoomed to verify the sharpness of nose hairs.
12-11-2008, 02:30 AM   #13
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I've never been able to really trust the LCD screen to judge sharpness or focus. I do use it to check histrogram/exposure and composition, and delete the ones I can see are beyond hope, or would require so much PP that I would never get around to it. Makes transfer times faster with fiewer images though. Once they are on my computer I'll actually look if what I want in focus is sharp and in focus, which usually results in even more deleting.

I say just take at least 5 pictures of anything you really want, and usually one comes out pretty good.
12-11-2008, 06:14 AM   #14

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As I stated earlier I use 16x to judge sharpness, while it doesnít look exactly sharp at 16x I know from experience how a sharp picture look at that magnification. (And yes, Iím a pixelpeeper)

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