The major restriction is if you have the L version, it's front element
protrudes into body of the lens, which will keep it from being mounted
on some lenses. The S version doesn't have that problem. but the L
version probably gives better results with lenses it's designed for.
I wouldn't hesitate to use an S version with any third party lens to
check for image quality.
On 4/16/2016 7:48 PM, Paul wrote:
Recent LBA forced me to buy a Pentax rear converter - the 1.4 version.
The Pentax compatibility chart is pretty specific about not using it
with some Pentax lenses. Does anyone have any experience using it
with any third-party lenses - Tamron, Vivitar, etc? Or is this a use
with Pentax only lens?
-p
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