That's strange. You would expect the opposite considering the sensor is
so much smaller than the film frame.
I got a Sigma 70-300 APO Super a couple of weeks ago (£65) and tested it
on the ist D immediately for CA. There is nothing to be seen at 100%
zoom (Photoshop) in the far corners of the images. If zoomed up hugely
the pixels do seem to have slight tints, but it takes a bit of
imagination to see them. I freak out if I see chromatic aberration on a
picture -- it totally spoils things for me. This is a personal aversion
stemming from bad experience with a Schneider 360/5.6 for which I paid
an enormous amount in the 1950s. Using this lens on Alpa Reflex bodies I
took hundreds of pictures of birds in Hwange national park (Rhodesia)
over several weeks. They had such blue fringes that I chucked the slides
out in disgust. The standard lenses I used then -- 50/1.8 Kern Macro
Switars were great. I still have one of those terrible slides. I'll look
for it. By the way I also have the Sigma 400/5.6 APO and this is also
good. It works well with a Tokina Doubler.
Don
William Robb wrote:
----- Original Message ----- From: "Russell Kerstetter"
Subject: Re: long lens for birds?
The Tokina 400/5.6 in good condition goes for around $150 then? Is
this MF or AF?
Also, about how much should I expect to pay for an A400/5.6? And
also, also.... for either of these lens' are there different versions
that should not be purchased?
I can't help you on price, that seems really variable, depending on
patience and luck.
I seem able to buy something off ebay and then see three auctions in
the next month end for less than I paid.
Anyway, I have both an A400/5.6 and a Tokina SD 400/5.6 (it's a manual
focus, contemporaneous with the A400/5.6).
The Pentax is definitely the better lens, I recall the Tokina had a
bit of chromatic abberation, the Pentax is nice, with a very crisp image.
The CA doesn't seem to show up on film, or at least not as obviously,
but does show on the digital.
William Robb
--
Dr E D F Williams
www.kolumbus.fi/mimosa/
personal.inet.fi/cool/don.williams/
41660 TOIVAKKA – Finland - +358400706616
