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Archive 2016 · acceptable corner sharpness
  
 
MikeW2
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p.1 #1 · p.1 #1 · acceptable corner sharpness


This is an example from a recent group shoot. 100 percent crop of upper left corner. What do you think? Some are like this, some are a bit sharper (in same set). The variance is kind of weird.

http://i13.photobucket.com/albums/a292/welde/internet%20shit/Screen%20shot%202016-10-16%20at%2011.21.30%20AM.png~original



Oct 16, 2016 at 05:23 PM
Mark_L
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p.1 #2 · p.1 #2 · acceptable corner sharpness


Even a bit sharper and I'd say that is well short of what I'd consider acceptable out of my equipment especially at iso100 and middle aperture.

It may well be acceptable for the usage though but only you know what that is. How many MP is the camera? What focal length? 1/100 is pretty slow shutter if it was handheld.

Are all four corners like this? if not, the lens is probably de-centred.



Oct 16, 2016 at 05:39 PM
Donzo98
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p.1 #3 · p.1 #3 · acceptable corner sharpness


Let's see the full pic..


Oct 16, 2016 at 05:52 PM
webmstrk9
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p.1 #4 · p.1 #4 · acceptable corner sharpness


Some lenses perform better than others, what was the gear used?



Oct 16, 2016 at 06:02 PM
MikeW2
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p.1 #5 · p.1 #5 · acceptable corner sharpness


Yes four corners are similar. It's a 18-55mm on a D7200. I've had some great results with it too. But obviously there are inconsistency's.

I didn't think this due to the lower shutter speed since the center is sharper. I don't know if I had the VR on, my exif won't tell me that information.

Focus point off?

Do I need to shoot at f/8 or f/9? I just feel like it's something else since the degree of sharpness has varied shot to shot.


http://i13.photobucket.com/albums/a292/welde/internet%20shit/Screen%20shot%202016-10-16%20at%201.07.44%20PM.png~original

Edited on Oct 16, 2016 at 06:11 PM · View previous versions



Oct 16, 2016 at 06:02 PM
glowhunter
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p.1 #6 · p.1 #6 · acceptable corner sharpness


you said some are sharper in the set, so it might be a DOF issue. What lens did you use? what camera? what focal length? where did you focus? How tight did you crop in your example? The original photo with exif data would be helpful.


Oct 16, 2016 at 06:03 PM
Donzo98
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p.1 #7 · p.1 #7 · acceptable corner sharpness


Original??



Oct 16, 2016 at 07:46 PM
mysh
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p.1 #8 · p.1 #8 · acceptable corner sharpness


I remember reading that the 18-55 is very weak at 35mm which is exactly where you took this shot. Try avoiding that focal area and see if results are better.
Also if using a tripod turn off VR



Oct 18, 2016 at 06:20 PM
mysh
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p.1 #9 · p.1 #9 · acceptable corner sharpness


I should add do a test to see if this is true with your lens. Set up your camera on a tripod and keep the aperture settings at something like F8 and ISO100.
Take pics at different focal lengths and check to see how the corners are. THis hopefully will show you its weak lengths and strong lengths. Then when taking important pics just try to select the better focal length.



Oct 18, 2016 at 06:36 PM
 

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Nexu
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p.1 #10 · p.1 #10 · acceptable corner sharpness


Try f8 or get a better lens. The 18-55 is a pretty cheap lens.


Oct 18, 2016 at 07:04 PM
rw11
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p.1 #11 · p.1 #11 · acceptable corner sharpness


the problem with Nikon's DX cameras is the DX lenses...


Oct 18, 2016 at 07:26 PM
Mark_L
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p.1 #12 · p.1 #12 · acceptable corner sharpness


In that case I think this is a case of a crappy lens. 24MP on a DX sensor is really going to show up lens shortcomings. There is only so much you can expect from a $100 lens I guess.


Oct 18, 2016 at 07:51 PM
Gregg Heckler
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p.1 #13 · p.1 #13 · acceptable corner sharpness


First, the lens is fairly sharp for a $120 lens but don't expect miracles. 2nd, no way f/6.3 was going to render the back row sharp, you need f/9 to f/11 at least. And 3rd, it looks like you have some motion blur on top of the everything else. Unless you were using trip 1/100 is not that fast. If you weren't using a tripod you should or try and shoot at a higher shutter speed or with VR on


Oct 18, 2016 at 07:56 PM
MikeW2
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p.1 #14 · p.1 #14 · acceptable corner sharpness


rw11 wrote:
the problem with Nikon's DX cameras is the DX lenses...


No issues with my 12-24mm. It's great.



Oct 19, 2016 at 08:00 PM
MikeW2
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p.1 #15 · p.1 #15 · acceptable corner sharpness


Gregg Heckler wrote:
First, the lens is fairly sharp for a $120 lens but don't expect miracles. 2nd, no way f/6.3 was going to render the back row sharp, you need f/9 to f/11 at least.


Thanks. Also, I have a feeling this lens is front focusing which would really exaggerate the problem. I'll check it out.



Oct 19, 2016 at 08:03 PM
BSPhotog
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p.1 #16 · p.1 #16 · acceptable corner sharpness


Yeah, the whole back row is OOF. Def a DOF issue.


Oct 19, 2016 at 08:12 PM
trenchmonkey
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p.1 #17 · p.1 #17 · acceptable corner sharpness


The D7200 sensor deserves better glass.
Crap on = crap out.



Oct 19, 2016 at 08:17 PM







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