Canon R100 + Tamron SP AF 90mm f/2.8 Di Macro Len,

[Chako]

I wanted to try my Tamron 90mm macro lens on the R100 for a week or so now. I just did an am not happy with the results. The lens and camera do not work well together. Not sure if its the camera and or the lens adaptor that is at fault here. What I do know, the Tamron clicks something fierce and sort of refuses to focus at times. I know Tamron had to reverse engineer Canon's proprietary software and stuff. So it is always a crap shoot if updating your camera body might affect third party lenses. Ah well, now I will have to try the lens on the Canon 80D at a later date to see if the issue persists on the DSLR side. All photos were hand held with no image stabilizing at this older lens does not have it. Here are the best of the not so great test shots.

IMG_1174A by Chako, on Flickr

IMG_1179A by Chako, on Flickr

IMG_1183A by Chako, on Flickr

IMG_1185A by Chako, on Flickr

IMG_1192A by Chako, on Flickr

[Vidar]

The luck of the draw with old third party lenses... Some long time ago I was a Canon development partner. Which sounds fancy, but really just meant access to various technical information and updates. And that they would sue you until exhaustion if you told anyone anything - or something like that. (I'm paraphrasing pages of tiny legalese into a sentence). Anyway, if you and your use get approved Canon do give access to key information about remote controlling, protocols and interfacing to their cameras. I don't remember if lens control was part of it as that wasn't my interest at the time, but I would assume it was. (Sony has similar "partner" program with even more legalise, and likely the others too). Thus I wonder if the third party lens manufacturers do know the right way, (some have even manufactured branded lenses for various brands), but that they on purpose have to go about their solution in a slightly different way to avoid licensing. As in they know the right answer, but have to give a different yet potentially slightly wrong one as a potential legal defence?

I have an old Sigma 150mm which works perfectly fine. But I prefer another option for macro - a TS 90mm lens with distance rings. Apart from being silly sharp it also lets you tilt the plane of focus which can sometimes help defeat the shallow focus of macro photography.

[Chako]

Possibly quite correct. Thus far, no issues with Sigma lenses for the most part. This is a Tamron however, and who knows. i do know Tamron being far closer to Pentax than any other third party lens manufacturer.