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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 28 Dec 2013 (Saturday) 07:24
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Is corner sharpness important at lower apertures?

 
JeffreyG
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Dec 28, 2013 19:51 |  #16

khwaja wrote in post #16560495 (external link)
Sone one in Sigam 35mm 1.4 thread mentioned that, sharpness moves with focus point. If one uses near the edge/corner focus point, those nearest corners will be sharp. Off center targets should be fine.

This suggests that the lens has a curved 'plane' of focus.


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P51Mstg
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Dec 28, 2013 20:01 as a reply to  @ post 16560531 |  #17

Eddie

Looked at your picture.... I think you described it wrong, its a picture of a dog toy with 2 relatively unrecognizable people in the background. Not a pic of niece and nephew holding a dog toy....

But for a pic of the toy .... Its cool....

Mark H


Too Much Camera Stuff......

  
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airfrogusmc
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Dec 28, 2013 20:20 |  #18

ZoneV wrote in post #16559827 (external link)
I often use lenses wide open and need high sharpness near the corners.
My converted Minolta Rokkor 58mm/1.2 works here good for me - even at f/1.2:

QUOTED IMAGE

QUOTED IMAGE

Me to

Leica 35 1.4 summilux wide open

IMAGE: http://i4.photobucket.com/albums/y118/airfrogusmc/L1005575_zps2f7e8607.jpg



  
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h4ppydaze
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Dec 28, 2013 20:43 |  #19

I can think of one recent example where I was thankful for the corner sharpness of the 24Lii. Though it printed on newsprint so it may not have really mattered a whole lot.

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Rain City Burgers (external link) by kyuis (external link), on Flickr

It's still nice to have for some situations. One that comes to mind is nightscapes. That being said the 16-35 is terrible in the extreme corners and it didn't hinder me too much.



  
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bobbyz
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Dec 28, 2013 21:13 |  #20

Dumb question - Can't we shoot little loose and crop if corner sharpness at wide open apertures is such a big deal for some? You got enough MPs for most situations. Please no I frame in my VF stuff.:)


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Clockwork ­ Frog
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Dec 29, 2013 00:25 as a reply to  @ bobbyz's post |  #21

Or use a cropped sensor camera. ;)


Some cameras. Some lenses.
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ejenner
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Dec 29, 2013 02:42 |  #22

bobbyz wrote in post #16560676 (external link)
Dumb question - Can't we shoot little loose and crop if corner sharpness at wide open apertures is such a big deal for some? You got enough MPs for most situations. Please no I frame in my VF stuff.:)

Yes and with some lenses it is a good idea with landscapes. For instance with the 17-40 the very extreme corners can still be poor at f11 and 17mm. Just cropping the outer 100 pixels can help which only takes away ~2MP.

I'm not sure about fast lenses and how quickly they deteriorate, so far for me and the lenses I have they are sharp enough even if I compose off-center (if I use an off-center focus point). I don't look carefully at the extreme corners wide open when I'm 'testing' them. Getting a flat subject sharp across the frame will be hampered by even small amounts of focal plane curvature.


Edward Jenner
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vengence
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Dec 29, 2013 08:51 |  #23

Clockwork Frog wrote in post #16561013 (external link)
Or use a cropped sensor camera. ;)

It's almost like exactly the same thing! :lol:




  
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jefzor
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Dec 29, 2013 11:15 |  #24

If you ask me: no.


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Is corner sharpness important at lower apertures?
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