Jump to content

24-90mm IQ


darylgo

Recommended Posts

Advertisement (gone after registration)

I received my new 24-90mm yesterday and started testing it both for close and far distance.  My tests were quick so maybe not conclusive but I am seeing an unusual characteristic.   At f8, normally a prime aperture, my sample shows less acuity in center than at f5.6 and f4.   This was consistent for both 24mm and 90mm.   Has anyone else found this on their lens or do I have a poor sample?  

Link to post
Share on other sites

I havent. Do you maybe have a longer exposure time at f8.0 and therefore more room for shake?

Tom, that may be the issue, my first tests were with OIS on and exposures were in the range of 1/8-1/2 second (tripod mounted) where shake could be an issue.   Further tests with flash and tripod-mounted (non OIS) showed the same results, however it was very minimal image degradation in this scenario.  Another possibility is focus shift at f8, I don't believe I would need to refocus at each set aperture, the camera focus' at full aperture afaik.      

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...