What does DF mean? (Sigma).

Taken from the Sigma website:

DF (Dual Focus) System

The DF (Dual Focus) system disengages the linkage between the internal focusing mechanism and outer focusing ring when the focusing ring is moved to the AF position. This system provides easy and precise handling of the lens, since the focusing ring does not rotate during autofocusing. The wide focusing ring also enables easy and accurate manual focusing.
 
Ah ok, thanks allot (y)

I'm also trying to find out if this is a lens that can be used on a full frame.....
 
stan the man said:
hi andy..hows life on the dark side ;)

and you know if you ever want to come back...we'll take you with open arms :LOL:
Click to expand...

Oh not too bad thanks mate.
I'll tell ya what though mate, I seriously miss that tilting live view screen.....

I have to lay on the bloody ground nowadays to get a low level shot :nuts:
 
andy_fozzy said:
Oh not too bad thanks mate.
I'll tell ya what though mate, I seriously miss that tilting live view screen.....

I have to lay on the bloody ground nowadays to get a low level shot :nuts:
Click to expand...

yeah,i've been contemplating selling the A350 as i don't use it since getting the A700,but then i think of those low down shots without getting down and dirty...:thinking:
 
stan the man said:
yeah,i've been contemplating selling the A350 as i don't use it since getting the A700,but then i think of those low down shots without getting down and dirty...:thinking:
Click to expand...

It really does make a hell of a difference mate.

3376898917_3f259e5998.jpg


for example :D
 
fabs said:
Who needs live view? Just stick your camera where it needs to be, trust your instincts and use the force! :D
Click to expand...

Mate, sticking things where they need to be, trusting my instincts and using force has seriously NOT done me any favours over the years.....

:D
 
Ahoy!

You can find all you need for the Sigma AF 28-70 F/2.8 EX Aspherical DF in the lenses section on Dyxum which is the bible website for all things Sony/Minolta, but it may also be a handy reference site for anyone really. Others have already provided info about it's format and what the DF version does that the earlier EX Aspherical doesn't, though the 28-70 F/2.8 was later replaced with the AF 24-70 F/2.8 EX DG and you'll see all other external links and model versions. FF wide-angle lenses aren't really that good on APS-C bodies, though APS-C UWA and WA zooms and primes are more readily available and are better quality than those for full frame, and that's the Achilles Heel for FF shooters should a decent affordable WA lens be required, but as all 3 sony FF models are dual format, there's no need to sell any lenses as long as you're happy with an 11MP image size when using APS-C lenses on a FF body.
 
You must log in or register to reply here.
Back
Top