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Author Topic: Your lens sweet spot...explained technically  (Read 99351 times)

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Offline Bree

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Re: Your lens sweet spot...explained technically
« Reply #240 on: June 01, 2012, 02:56:02 PM »
the cropped sensor is forced to take only the images that passes through the center part of the lens, thus you dont have to stop it down


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Re: Your lens sweet spot...explained technically
« Reply #240 on: June 01, 2012, 02:56:02 PM »

Offline guelmigz

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Re: Your lens sweet spot...explained technically
« Reply #241 on: July 30, 2012, 09:02:41 PM »
thanks for the good info, is this the same with all third party lenses as well?

Offline rcl0527

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Re: Your lens sweet spot...explained technically
« Reply #242 on: August 15, 2012, 10:30:39 AM »
thanks for sharing

Offline javathedot

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Re: Your lens sweet spot...explained technically
« Reply #243 on: August 21, 2012, 11:49:05 PM »
thanks for the good info, is this the same with all third party lenses as well?


Yes. As of today, it is one of the limitations of lens production. Sharpness degrades towards the edges especially at widest aperture setting. On www.photozone.de lens reviews, they specify different lens sharpness figures for both center and border (edge).

A better lens is said to be one that pushes sharpness towards the edges. So far, the L lenses (and Nikon equivalent) have the best center to edge performance (Canon 18-55 IS kitlens and Tamron 17-50 non-VC are good too). But still their edge sharpness is not at par with center. This is not noticeable unless the image is viewed 100% (pixel peeping).

Some lenses that suffer worse edge sharpness are: olympus 17mm f2.8 pancake lens, E-mount 16mm f2.8 pancake lens and Sigma 30mm 1.4 DC. This means that a smaller area at the center is excellently sharp and softness gets worse and worse toward the edges. But if these lenses are used for shallow DOF, then border softness is not an issue.

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Offline jomblass

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Re: Your lens sweet spot...explained technically
« Reply #244 on: September 13, 2012, 06:32:14 AM »
very informative... thanks to everyone who shared their knowledge about the sweet spot...

personally though, it's very seldom that i use my sweet spot, usually when taking pictures of group of people only. i love the bokeh produced at f1.4 ~ f2.8 for potraiture. macro shots, landscape at f11 and above for DOF.. indoor shots at f1.8 ~f2.8 for faster shutter speed because i don't have a flashgun..

i'm still a newbie, but when i understood the relations of aperture, shutter speed, ISO, DOF etc, that's when i started to care less about the sweet spot and focus on the settings that i need in the current situation where i will take the shot to achieve my desired effect. just my 2cents...:)




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Offline c010504

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Re: Your lens sweet spot...explained technically
« Reply #245 on: October 30, 2012, 01:52:37 PM »
i was enlightened with this topic, i'll save this as favorites  :D :D :D
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