Is this an internal focusing lens? Or does the lens barrel extend as you focus?
133386
It is not an internal focusing lens - the barrel extends as you focus. That being said, there is a convenient macro ratio scale on the lens barrel, and it's very handy when setting up a macro shot. This lens is NOT a fast-focuser; it does not have the Sigma HSM (hyper-sonic motor) technology. This being said - the 105mm f2.8 EX DG is probably the sharpest lens in my bag, including some lenses that were 3x as expensive. Bokeh is spectacular, and if you're willing to slow down and accommodate the older mechanical design, you'll be rewarded with exquisite sharpness and beautiful bokeh.
1751197
Everything is internal. the lens does not change length when zooming or focusing.
466968
No, it's a fixed magnification. You can adjust the focus by getting closer or farther away from the object you're magnifying.
960475
No, but I believe there is a wide angle "mode" in the options. That said, it's really not the same thing as a wide angle lens.
2018742
This lens is manual focus. I use it with a canon 5D II. It is very sharp and well worth it for full frame cameras. I use it strictly for tripod landscape shots.
1799494
It is a manual focus that is done by pressing on the outside ridge of the lens itself. Once you get your area of focus, you can adjust the"look" by pressing the lens to one side or the other.
169595
Manual focus only. Also it has a fixed so you'll be spending time getting your shutter speed and ISO set up for proper exposures. All in all a fun lens.
1433437
I would say at max zoom it extends to about 6 inches. I don't have it to measure. Search on youtube for some demonstrations, that is what I did. Great lens!
1791107
Not sure what that means, but it does expand out and up to a full size tripod. You will love this lens! It is truely a walkaround lens, replacing my telephoto lens and my 18-55 starter lens.
1490665
The zoom ring is the wide one in front and the manual focus ring is the thin one just behind it. Yes, this lens extends forward when zooming.
149358
Not at all, it's all internal. And there's no zoom it's a 55mm Lens. We also purchased the other FE lens which we actually waited for and it was disappointing. This Lens is very well rounded. There's no cornering issues and the focusing is impecable. I'll wait for April when the next zoom Fe lenses come out. Sony should listen to his core audience like us... The A7r is a wonderful camera... If you have one ill recommend this lens blindfolded.
1490666
The focus ring is the small one close to the mount. The large ring controls the Zoom and yes it does extend out.
1157942
As MDA pointed out, the nodal point moves on all zoom lenses, whether or not the external barrel extends/retracts. I have shot panoramas with this lens's big brother (f/2.8) and been very satisfied with the results. I think this is a non-issue.
1394636
Like the rest of the comments, you are right, it will become a 48mm lens, pretty close to what you see is what you get through the viewer. I did notice the lens it has a unique sound when it is focusing. it is pretty cool. I been using this lens for a while now, and it took me a little to get use to it. (I normally shoot with a 18- 200 zoom) so moving forward and backward to get the shot took some getting use to.
1823795
I suspect you have extension tubes mixed up with a telextender... The extension tube set is used for closeup work... whereas the extender will multiply the focal length by 1.4 or 1.7 or 2.0 The downside of the extender is usually quality of the image and in some cases loss of automatic focus ability... Glad to answer more if you can explain what you are trying to accomplish...
705680
It IS an autofocus lens. I suppose some vendors just don't include that in the description. Hope that answers your question.
955255
It is focus-able to the viewer. I can't see clearly past 2 feet without my glasses. I see through this perfectly when I focus it. It's a tough little scope. I've been very happy with it. -DM