A friend of mine has several old screw mount Pentax lenses.  He wants to get
a digital SLR.  Does Pentax make an adapter so that he could use these
lenses with a current model?

Another aquarium pic from the Totally Discontinued 20D:
http://www.pbase.com/bret/image/56527912

I want to buy a portrait lens for my EOS and my first candidate is EF
100/2.0 USM.
However, I've never done macro photography before and feel like giving
it a try, so I'm also thinking about EF 100/2.8 Macro USM. But macro is

http://www.pbase.com/markuson/image/56611919/original
Obviously a sunset...off La Jolla, CA

What is a good portrait lens for the 20D?

The consensus is that using a Linear PL on classic TTL SLRs ( an MX in
my case) fools the meter, while a Circular PL does not.
I would appreciate if someone could explain  what is the metering error
in f/stops in practice, and if the error difference between the two

Any reason the instructions say don't use on a micro fiber cloth??
--
Colyn Goodson
http://www.colyngoodson.com

Is there a general rule for which zoom lens you would use when there's
an overlap?
For example, let's say you have a 20-35mm zoom, and a 28-105mm zoom,
and the picture you want happens to fall at 32mm.  Assuming that both

I have a Nikon FM2 and I need to find a standard zoom lens for it.
Problem is there seems to be a wide range in prices. So here are the
ones I found on B&H.
Kalimar 28-70mm $39

What is this ancient nikkor 28mm f/2?
http://images.mpire.com/1100/joesoldit/329024.jpg
http://images.mpire.com/1100/joesoldit/329027.jpg
http://images.mpire.com/1100/joesoldit/329026.jpg

I went down the street to the Tennessee Aquarium during my lunch hour
the other day, armed with only my discontinued Canon 20D and the 17-40
f/4L.  This was more of a scouting trip since I was in a hurry.  I
joined up for the year so I'll be going back often, so consider this as

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