I have a 1.4x Pz-AF MC4 Tamron-F TELE-CONVERTER.
I'm not impressed with it as much as I am with the Tamron AF ASPHERICAL
LD 28-200 1:3.8-5.6 lens I bought it for. And I'm pretty sure I've
mentioned before how disappointing I found that lens.
The lens is not sharp and has a lot of CA. The lens + TC is noticeably
less sharp and has a lot more CA.
Maybe I just got stuck with bad examples, but I wouldn't recommend
either one. If you got the TC for free, you didn't pay too much, but
otherwise ...
The Sigma EX 10-20 1:4-5.6 I have is a DC lens for digital. On my PZ-1p,
it vignettes noticeably at 20mm and at 10mm it's like shooting through a
porthole.
From: CheekyGeek
I have no experience with AF teleconverters, but have the MF Adaptall
2 version of both the 2x and 1.4x that I planned to use with my 52B
90mm f2.5 Macro SP. It will do 1:2 by itself and 1:1 with the 2x, so I
believe that means it will do 1:1.5 with the 1.4x.
The main advantage of the 1.4x (to me) is that you are losing only a
stop of light instead of 2 stops with a 2x. Nice to have when that is
a factor.
The Sigma EX 10-20mm f4-5.6 will also cover a full 35mm frame, at
least down to about 13mm. That probably makes it about the widest
rectilinear you can put on a film camera.
Need to carve out some time to actually USE all the stuff I've been
accumulating. Your 1.4x to 2x image degradation comparison would be
interesting to do.
Darren Addy
Kearney, NE
On Sat, Aug 28, 2010 at 11:47 PM, Larry Colen <[email protected]> wrote:
>>> I probably got it when I bought someones bag of gear, saw that it
>>> was a TC and just tossed it in the drawer without looking at it.
>>>
>>> I just tried it out and it seems to work fine on autofocus. ?Does
>>> anyone have any experience with one of these? Would it degrade an
>>> image less than cropping it by a factor of 1.4?
>>>
>>> Another cool realization I had was that my Sigma 20/1.8 will work
>>> just fine on a K1000 body that I've got lying around, and it'll
>>> give me a view that is wider, and faster, than my 16-50 on the
>>> digital body. ?Albeit, that ASA 400 film doesn't seem to be nearly
>>> as good as ASA 400 on the sensor.
>>>
>>> In any case, it should be fun to play with.
--
PDML Pentax-Discuss Mail List
[email protected]
http://pdml.net/mailman/listinfo/pdml_pdml.net
to UNSUBSCRIBE from the PDML, please visit the link directly above and follow
the directions.
