If the focus is set for 4X does it need to be reset at 16X?
765725
you just need to set it at 100 ft afther that you can change focus without the need to set the scope again
629972
Yes but you must use manual setting on your camera and you must manually focus
1591738
yes, and you can set it to auto spot focus or continuous focus or set it to manual focus
1491523
Thanks for the explanation, Les. So, it seems that as long as the IS is turned on, in-camera, it doesn't matter whether it's on or off on the lens. I made do some A/B testing to see if there's a difference with the lens switch on/off while the setting is switched on in-camera.
386986
it's kind of pointless to AF fine tune with a zoom, since AF fine tune works best with single focal lengths. with AFFT, you can only set focus for one focal length, i.e., if you tweak it to work at 17mm, you'll be off at 50mm. you might have to send the camera and the lens in to to Sigma to have them perfectly calibrated.
1609945
I am Sorry i forget to Include this Information with My Response! Be Sure to Include a f-Stop Increase to being thing into Focus Also! This is Very Important Too! It is Something You Have To Experiment with to get Correct! Not Hard to Do, Just Use Live View on your Camera and Play with it from there! This Aspect is Very Tricky for Focusing and Experience will be Needed to some degree!
2255431
Occasionally it messed with the focus for a second or so til it worked things out but i never noticed. Here's as good a test as you'll see. http://youtu.be/cj5NBvNEksg
1692734
The TC will probably not autofocus at less than f4 but on manual focus it should be fine.
304090
In order for any lens to be able to autofocus correctly, the minimum aperture after the teleconverter is added must still be f5.6. Therefore this lens with either the 1.4x or 2x would be manual only.
512484
This is not an official statement but I've been shooting a lot. And I 99% use single point AF, manually setting focus point according to my subject. I never noticed a left focus or lock up problem.
1037488
Turn the little black thing on the end of the lens a little at a time, that will focus. Then u can mov
1813604
I think it is your choice. If in really low light I would use manual focus because auto focus does not respond very well. Hope this helps you.
830313
It's like any other modern 70-200 f2.8. If you set it to f2.8 in manual it will stay there. In auto mode the camera will change shutter speeds and aperture to suit conditions.
2012319
Yes. Zoom and Focus are manual with the inner ring for the later.It s a little bit to freaky not so gradual control.Its endless so no physical connection with lens I guess.
1928125
Not normal from what I can tell. It shouldn't unscrew, it should change focus from blurry to clear to blurry.
1147230
Mine has done this on occasion. It will focus out and then back in but usually in portrait mode. It seems for other settings it will not do that.
266375
None at all on my M- it is a bit slow in the focus- but when I combined it with a short loupe to act as a viewfinder it became handy. Mine works perfectly except for the focussing time. VRR