veeav wrote:
> I am using a Tamron 90mm on a D80 for macro.
>
> When shooting flowers, fungi etc. where there is not much distance
> between the subject and the background how (if at all!) can one
> ensure that there isenough depth of field so that the whole of the
> subject is in focus but that the background is not in focus.
>
> Does the length of the lens (eg 90mm in this cast) play any part in
> this? Would you get the same result with a 150mm macro lens.
>
> Thank you.

For macros, the longer the FL the better...I have a Nikon Micro Nikkor 55mm f2.8 AIS and a Tamron 90mm f2.5 SP Macro but since I got my Nikon Micro Nikkor 200mm f4 IF they have both been consigned to the useless lens cupboard!
Stopping down past f16 seems to have no detrimental effects of sharpness with the 200mm f4 micro either.
Here is a pic of an unknown Aphid I took today with it, handheld at f22 (The Aphid was between 4-5mm long):

http://www.gigafiles.co.uk/files/18/SDIM1804c.jpg


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