New Sigma 50-100 f1.8 DX lens: Has anyone heard anything about this lens? I noticed this article in Google newsfeed:...

steve_stoneblossom Loc: Rhode Island, USA

Has anyone heard anything about this lens? I noticed this article in Google newsfeed:
http://nofilmschool.com/2016/02/sigma-50-100mm-f18-30mm-f14-mc-11-e-mount-lens-adapter

EDIT: Guess I've not been paying attention. Was it released last spring?

MT Shooter Loc: Montana

steve_stoneblossom wrote:

Has anyone heard anything about this lens? I noticed this article in Google newsfeed:
http://nofilmschool.com/2016/02/sigma-50-100mm-f18-30mm-f14-mc-11-e-mount-lens-adapter

EDIT: Guess I've not been paying attention. Was it released last spring?

I became available May of 2016. Its the longer companion to the Sigma 18-35mm F1.8 Art lens, only the SECOND F1.8 Zoom lens released. Its an amazing lens for speed, color and sharpness on cameras like the Nikon D500 and Canon 7D MK II. GREAT indoor sports lens!

Jim Bob

MT Shooter wrote:

I became available May of 2016. Its the longer companion to the Sigma 18-35mm F1.8 Art lens, only the SECOND F1.8 Zoom lens released. Its an amazing lens for speed, color and sharpness on cameras like the Nikon D500 and Canon 7D MK II. GREAT indoor sports lens!

What about other cameras like the D750 or D7200?

Gene51 Loc: Yonkers, NY, now in LSD (LowerSlowerDelaware)

Jim Bob wrote:

What about other cameras like the D750 or D7200?

DX only, so it should be great on a D7200, with the D750 only in crop mode.

Jim Bob

Gene51 wrote:

DX only, so it should be great on a D7200, with the D750 only in crop mode.

Thanks Gene.

Gene51 Loc: Yonkers, NY, now in LSD (LowerSlowerDelaware)

Jim Bob wrote:

Thanks Gene.

It's an amazingly good lens btw - a friend just got it for their Canon 7d Mk II - and my first impressions are that it is everything Sigma says it is and more.

steve_stoneblossom Loc: Rhode Island, USA

Gene51 wrote:

It's an amazingly good lens btw - a friend just got it for their Canon 7d Mk II - and my first impressions are that it is everything Sigma says it is and more.

Any word on effective focal length loss at long end, which is already shorter than desired?

Gene51 Loc: Yonkers, NY, now in LSD (LowerSlowerDelaware)

steve_stoneblossom wrote:

Any word on effective focal length loss at long end, which is already shorter than desired?

Not sure what you are asking - on a Nikon, the field of view is the same as a 150mm lens, the maximum aperture remains 1.8 - depth of fiend at 1.8 is similar to a 33.3-66.7mm F2.8 lens - give or take on the DoF.

steve_stoneblossom Loc: Rhode Island, USA

Gene51 wrote:

Not sure what you are asking - on a Nikon, the field of view is the same as a 150mm lens, the maximum aperture remains 1.8 - depth of fiend at 1.8 is similar to a 33.3-66.7mm F2.8 lens - give or take on the DoF.

Some zooms have a reduced 'effective' focal length at the long end of their zoom range when focused at shorter distances. My 28-300, for example, produces an image roughly equivalent to a 150mm lens when focused closer than 5 feet.
Would anyone know if this lens is subject to this phenomenon?

Gene51 Loc: Yonkers, NY, now in LSD (LowerSlowerDelaware)

steve_stoneblossom wrote:

Some zooms have a reduced 'effective' focal length at the long end of their zoom range when focused at shorter distances. My 28-300, for example, produces an image roughly equivalent to a 150mm lens when focused closer than 5 feet.
Would anyone know if this lens is subject to this phenomenon?

Ah, focus breathing. I haven't heard anything about it. I generally don't worry about it - it just means i have to get a bit closer to my subject compared to a similar focal length that does not exhibit breathing to get the same composition. I have not been negatively affected by it so far. Nearly all internal focus lenses primes and zooms alike - exhibit a focal length change at minimum focus distance.

The only lenses I own that do not do this are my 24, 45 and 85 mm PC-E lenses - they do get longer as they are focused closer, and the maximum aperture gets smaller as you get to 1:2 magnification. My 85mm F2.8 PC-E lens becomes an 85mm F4.2 lens at 1:2, it's maximum magnification.

steve_stoneblossom Loc: Rhode Island, USA

Gene51 wrote:

Ah, focus breathing. I haven't heard anything abou... (show quote)

I always thought that focus breathing was a totally separate and unrelated phenomenon. Thanks for clearing that up, Gene, and for giving me something else to wrap my head around.