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Forum: Pentax K-1 & K-1 II 03-15-2016, 02:17 PM  
tamron lenses
Posted By TheOneAndOnlyJH
Replies: 8
Views: 1,829
Which isn't to say that it isn't compatible, just that it's only guaranteed to fill an APS-C image circle so it might have vignetting or softness on the edges and corners in full frame mode. They should work perfectly fine in APS-C crop mode.

Once the K-1 is widely available there will probably be a list developed somewhere on this forum where people will share the extent that their APS-C lenses do or don't work on the K-1 in full frame mode.
Forum: Pentax K-1 & K-1 II 03-15-2016, 12:27 PM  
tamron lenses
Posted By TheOneAndOnlyJH
Replies: 8
Views: 1,829
Good point; I keep forgetting that there are different apps that display it differently on mobile.
I've edited it so it should show better now.
Forum: Pentax K-1 & K-1 II 03-15-2016, 09:37 AM  
tamron lenses
Posted By TheOneAndOnlyJH
Replies: 8
Views: 1,829
You didn't mention any specific lenses, so I'm not sure exactly what you're looking for.

In short, if it has a K-mount, it is compatible with the K-1.
The long version,

Not all Tamron lenses are available in K-mount.
Some Tamron lenses have been re-labeled as Pentax lenses.
Lenses designed for digital may work in APS-C crop mode but show vignetting in full frame mode.
New future Tamron lenses may or may not be released in K-mount; this remains to be seen.

If you look in the Lens Review Database you can find info on many Tamron lenses compatible with the Pentax K-1.
(Some are fully manual only, some are manual focus, some are screw drive auto focus, and some are adapted from other mounts.)
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