Using a lens made for a cropped sensor on a fill frame camera

[artieology]

I've got a Sony a77 and am looking to upgrade to the Sony a99 full frame. I have a few DT lenses from Sony that were used on the A77. If I try to use them on the full frame A99, will the photos look like they were taken with A77 or will the cropped lenses just not work at all with the A99?

 

[heidfirst]

if they are Sony DT lenses then the A99 will detect this & automatically switch to crop mode so they will look like they were taken on a ~11MP APS-C camera (but a very good one ).

 

[Chobber]

I can confirm this as i recenly upgraded to A99 from A77 and the DT lenses work but only at 10MP.

 

[artieology]

I also realized that if the A99 switches to the cropped format, the ISO switches back to cropped format as well as if it were back to an A77 so it's like having two cameras in one. It can shoot 14 frames per second in the cropped format but will also knock down the resolution a lot.

 

[heidfirst]

I also realized that if the A99 switches to the cropped format, the ISO switches back to cropped format as well

there should be no difference between ISO on a crop from the same sensor?

One other nice thing about the A99 is that the viewfinder (being electronic) resizes to APS-C rather than just having guidelines thus making composition more accurate.