Jim,
Depth of field will obviously be the same on the 20mm and on the 20-35 at 20mm.
The 20/2.8 will focus a bit closer, allowing you to get closer, which will
give greater magnification to the object closest to the lens, possibly
making the composition more dramatic. This is one of the reasons why I
chose the 20/2.8 lens over the 20-35/3.5-4.5 lens.
As you can see from your pictures, you don't need perfect sharpness at
infinity (depth of field) for these pictures to be nice, as long as the
object closest to the lens is in focus.
I like your pictures taken with the 20mm lens.
Pierre
At 10:03 6/14/2001 +0900, you wrote:
> Well, Pierre Bellavance mentioned he might want to shoot something like
>flowers
> up close in focus, with background going off in the distance. He was
>concerned
> about the closer focusing on the EF 24mm lens than the EF 20-35.
> Well, ever since then, I've been intrigued about this type of situation,
>and wondering how my 20-35 would do under such conditions. So, on my last
>roll of film, I shot some flowers at minimum focus distance, using F22, and
>with different types of background going off in the distance.
> First of all, there is no way to keep everything in focus from minimum
>to infinity, even at F22. Infinity is fairly sharp on a small print, just
>not really in focus.
> The other thing I found interesting, and the reason I wanted to try this
>was: what kind of photo would warrant this treatment, and what could be done
>with it? I found it difficult to frame an interesting shot this way, perhaps
>one day though a great scene will unfold for me using this method. I did
>however, get some interesting shots, that at least demonstrate the abilities
>of the EF 20-35 at 20mm, minimum focus. I've got a feeling the difference
>between the EF 20 and the 20-35 at 20mm would be very slight indeed. If you
>could get close enough to really emphasize one flower, it might make a
>difference.
>However, with minimum focus being closer, likely the perceived focus in the
>background
>would be less.
> I'd be interested just how well in focus infinity is on the EF 20 at
>minimum focus distance, using F22, Pierre.
> And lastly, here's a link to my test photos. Please comment on
>suggestions for future shots using this method, and how you thought the EF
>20-35 did.
>
>http://www.kjsl.com/~jbdavis/Photo_Tests/20-35/20-35.html
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