100-300 with Kenko extension rings - focus range

Started Jan 11, 2013 | Discussions thread
Fred Bauer
Junior MemberPosts: 28
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Re: Image Quality
In reply to _sem_, Jan 16, 2013

Just got the Kenko DG set from Amazon. On the 100-300 I concur that IQ peaks at 7.1. Using a tripod and remote release and 16mm tube I'm having no problem with AF at pinpoint (GX1).

However, the same setup under the same conditions with the 45-175X produces extreme CA on any out-of-focus form. Anyone else seeing this with this lens or other ones? No sign of CA with the 100-300.

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