Unconfirmed but promising...

[Jason C Doss]

http://forums.dpreview.com/forums/read.asp?forum=1030&message=19430961

Not sure if this picture is legit, but it's been a secret fantasy of mine for about a year.

 

[Nill Toulme]

What's the aperture on that 50-150? Is that a full frame lens? A 35-135 or 50-150 f/2L IS has long been a fantasy of my own, as the ultimate high school basketball lens.

Nill
~~
www.toulme.net

 

[Tom Yi]

The 70mm macro has been announced already and maybe ready for sale soon.
Sigma has it on their website. http://sigmaphoto.com/lenses/lenses_all_details.asp?id=3317&navigator=5

The second lens, I have not seen before, but seeing as it says "DC" on the barrel, it's made for cropped sensors. Looks like a cropped sensor version of a 70-200 f2.8 to me.

 

[Jason C Doss]

What's the aperture on that 50-150? Is that a full frame lens? A 35-135 or 50-150 f/2L IS has long been a fantasy of my own, as the ultimate high school basketball lens.

Nill, this is an f/2.8 constant aperture 50-150 DC lens for 1.5x sensors. Even though I've never used a 1D, I've always been curious to know how these DC lenses work with 1.3x sensors.

 

[Rob Peterson]

Nill, this is an f/2.8 constant aperture 50-150 DC lens for 1.5x sensors. Even though I've never used a 1D, I've always been curious to know how these DC lenses work with 1.3x sensors.

Apparently the Sigma DC lenses won't work with 1.3x sensors. Several of Sigma's Web pages talk about the "DC" lenses working with cameras with APC-C size sensors, which excludes the 1D series. For example, Sigma's Lens Chart Web page says in a footnote, "DC lenses: ... An image sensor element larger than than those corresponding to APS-C cannot be used in digital cameras or 35mm film cameras. If such an element is used vignetting will occur for digital cameras."

I've read that the mirror will hit the back of Canon's EF-S mount lenses if the lens is mounted on cameras with sensors larger than APS-C.

Bob

 

[Tom Yi]

Well, both of the lenses have been introduced at the U.S.'s site.
http://sigmaphoto.com/lenses/lenses_all_details.asp?id=3318&navigator=6
http://sigmaphoto.com/lenses/lenses_all_details.asp?id=3317&navigator=5

The 50-150 promises to be a very small and light lens that will mimic the classic 70-200mm range in 35mm format, all while retaining fast aperature (constant f2.8).

Sigma has been coming up with a lot of good products lately.
Good for them, and us as well.