Using wide angle lenses and DMR

[Simon Gleave]

Advertisement (gone after registration)

Attached are a couple of pictures taken with the DMR using a 16mm lens. I am trying to undertand why those at F2 are out of focus at the edges while those using f8 are ok

 

Any ideas as to what the problem may be?

[Advertisement]

The Leica Q3 is available for pre-order at B&H Photo Video and Adorama

[carstenw]

What lens is this? Not all lenses are sharp at the edges wide open.

[pascal_meheut]

And what 16mm f/2 did you found to put on the DMR ?

[Simon Gleave]

The lens is a 16mm F2.8 fisheye - elmarit - R

 

I also have found similar effects with all the lenses I use but they are most pronounced ith the wider angles

[robsteve]

Simon:

 

I think it is just related to the qualities of the lenses. Few super wides are sharp at the edges wide open. The exception might be the 19mm ROM on the the DMR, but you need to have a good copy.

 

What other wides are you having problems with? If you are shooting Leica wides, you can look up the MTF curve on the Leica web site. I think I once calculated that 15mm-16mm on the MTF curve is the edge of the sensor. If the graph take a big dip before 15mm, the lens will not perform as well on the edges of the frame.

 

Robert