Birger and Sigma?

[Jim Arthurs]

Any reason the focus/iris control would be an issue if someone was interested in getting these Sigmas (in Canon mount) for their Birger?

http://www.amazon.com/exec/obidos/ASIN/B000JDJJ82/streetprices12-20

http://www.amazon.com/Sigma-50-150mm-Telephoto-Digital-Cameras/dp/B000HPOQKS/ref=sr_1_1/103-7127584-3493442?ie=UTF8&s=photo&qid=1189277357&sr=1-1

Suddenly I've developed a facination with Sigma glass...

[Mike Prevette]

The Sigma mechanics leave a LOT to be desired. We used to call them "SiGnifigant MAlfucntion". They are held together with carpet tape. Which could lead to some serious usability issues. However the optics inside are superb. If only someone made them in a PL mount. . .

_mike

[Vincent S]

I recently tried the Sigma 50-150 and it's an amazing lens, 100% solid on all fronts. And I really liked the 50-150 range on a 1.6x crop factor camera. If they work with the Birger mount is anyones guess as we are all waiting on final details.

[Paris Remillard]

Since they work on canon dslrs, I can't see any reason why there would be a problem.

[Jim Arthurs]

A little more research makes me think so too... at least there they are as an option to Canon glass. Most user reviews praise the build quality as being solid, at least with the models I mentioned, so who knows?

The 18-50 has a different auto-focus system than the ultrasonic motor in the 50-150 or the 10-20, but it's possible it would work as well. The only other issue with the 18-50 is that it telescopes out of the housing a bit... which I hate, and would complicate matte box work, but then so do the other still zooms I've looked at in that focal range.

All these Canon mount still lenses have me excited, but it all depends on the tactile response of the Birger mount and how it actually handles in the real world...

[planet e]

i have some very nice sigma glass. it would be great to be able to use them on RED with the birger mount, but it's definitely all just speculation at this point. i had a couple of sigma lenses which i was able to mount on an XL2 and use them the same as mounting a canon lens, so i think it should work fine. i also have a very nice tamron lens (24-135mm) which works great on my canon still cams but which did *not* seem functional with the EF adapter required for XL2 mounting. i could never figure out why, but it does have one of those lenses which zooms in and out of its housing. like the bigma. that's the only difference that i could see.

should be interesting to see how the choices play out....

[ericyoung]

Pretty sure Sigma and Tamron lenses are reverse engineered from Canons, and use their own electronics. So if Canon ever change their firmware, then some of these third party lenses will no longer talk to that Canon equipment properly.

I think Sigma will update lenses which stop working with newer Canon hardware.