Comparing sharpness of different lenses at different focal lengths?

3 years 8 months ago #693359 by Happy Hour
What is the best method for comparing or testing rather sharpness of different lenses at different focal lengths?  35, 85 and 70-200mm for example?  Is this something that can be done without a ton of technical gear?


Photo Comments
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3 years 8 months ago #693360 by Nikon Shooter
The only absolute priority here is the AF fine tune. I do not
know your camera nor is it has AF fine tune function in the
menu but that is the fist thing to investigate with each and
every lenses you want to test and compare.

Light is free… capturing it is not!
Photo Comments
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3 years 8 months ago #693361 by fmw
You can "pixel peep" to give you an unmeasured idea of it.  Be sure to check the corners as well as the center.  Measuring lens resolution requires a collimator.


Photo Comments
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3 years 8 months ago - 3 years 8 months ago #693394 by Ozzie_Traveller
G'day HH

Funnily enough I have done something like this recently

Target -- a brick wall at home, camera to wall distance - about 6-7 metres / 20-24 ft; camera on tripod, using remote to fire shutter, O.I.S='off'

I shot exposures at max open and 2/3 stopped down ... ie: F2,8 at min zoom then F4,5 as the zoom max aperture stopped itself down and also F11. At full zoom I framed the bricks, ran some duct tape around the 'frame' for consistency, took the pics, then moved tripod closer as the zoom 'widened' and carefully realigned the tripod so I was still inside the duct-tape frame. In the end I shot at 480mm to 360mm to 240mm to 120mm to 24mm

In the computer I rotated each image by 33deg so that the corner to corner of the image was now horizontal, took a copy-slice of that portion of the image and pasted it into a new canvas of 9000px x 6000px. Thus I ended up with 5 'slices' across the new canvas - then had it printed onto an A3 sheet / 12" x 18" and carefullly examined under a magnifier. The end result showed me how sharp my Leica zoom lens actually is

I could post a reduced-size image here if it intersts you - but I suspect that you could easily create your own set of testimages

Bottom line here - this is the sort of test you can DIY easily and can be repeated also without any costly tech stuff

Hope this helps
Phil from the great land Downunder
www.flickr.com/photos/ozzie_traveller/sets/

Phil from the great land Downunder
www.flickr.com/photos/ozzie_traveller/sets/

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3 years 8 months ago #693590 by Ozzie_Traveller
G'day HH

Any thoughts on the above??

Phil

Phil from the great land Downunder
www.flickr.com/photos/ozzie_traveller/sets/

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