This is a slight step downward in image quality from the two Zeiss
listed above, but still a very great lens. It is no longer made, but
copies come up on Ebay for between $2500-3000, and are worth
the money. For many years this was the workhorse lens for
everything I did, the best all-around (walk-around) macro lens that I
know of.
Unsolicited Advice
What follows are comments, notes, suggestions, warnings, etc.
related to photography, macro and close- up photography, and
focus stacking. They are roughly organized and are intended to
give you some information on commonly asked questions and
areas where that I feel should be pointed out.
My Standard Kit
I travel light. Aside from my camera and tripod, I usually take only
one lens and that is attached to the camera. I also take a couple of
22-inch diffusers, one opaque and one about with a very light
screen. I carry a flowerpod, which is an tiny expandable tripod
(about 48") with a short arm that can hold diffusers or grab the stem
of a plant that is trembling in the wind and stabilize it. You can find
them here. They are great.