Thanks Walter...that is good to know.
Yes I purchased the 210 lens for portraits; I find the 135 mm lens can be used in the studio also.
The pics featured here are mainly medium format (Hasselblad and Pentax 6 x 7)
I have only just recently started using 4 x 5 lrge. format.
I would like to use 8 x 10 when I grow up.