On Jul 5, 2005, at 6:55 AM, Joaquim Carvalho wrote:
A guy that does lens repairs showed me a Pentax 35-70mm macro lens
modified to do 1.6:1 magnification without rings, more than any
standard
Pentax lens can do. I took it home to make some tests.
I would be very interested to know what the modifications entail.
I took a close-up picture of the MX speed selector:
http://x64.com/joaquim/photo/photo05/
Second picture is a pixel by pixel center crop.
Looks pretty good. I don't expect it to compete with a true macro
lens in ultimate quality, but the only way to say for sure would be
to test the modified zoom at the same magnification against a
particular macro lens with an appropriate target.
Is this lens good? Will a 50mm F4.0 or F2.8 be sharper?
I have the A50/2.8 Macro as well as the F35-70/3.5-4.5 Macro, which
achieves 1:4 magnification.
There is no question that at 1:4 magnification, the A50/2.8 Macro
prime lens has better rectilinear correction as well as higher
resolution than the zoom.
Godfrey
