Boris Liberman wrote:
Hi!
It is 90/2.5 1:2 macro and with matching adaptor it is 180/5 1:1
macro. The latter being even more useful because of greater working
distance from the subject - less intrusive!
How well does the adaptor work? I mean, does it hurt the performance
in any way? I guess I'm a bit sceptical to using an extender, based
on the fact that the whole point would be to replace a 2X macro
focusing teleconverter (which I've used mainly with 50mm lenses)..
Unless I am mistaken, this adaptor was designed along with the lens.
It says somewhere that one can use this adaptor with other Tamron
Adaptall lenses, but it is still *matching* adaptor.
The macro focusing tele-converter that you have (I suspect it is
Vivitar) is general purpose optic.
Yes, it's the Vivitar one. I think it's actually one of the better
better tele-converters, but still has it's limitations. One problem is
that it seems to "steal" some of the light, and it seems to me that for
macro work, you really need all the light you can get (because you want
to stop down quite a lot.)
I've done some photography (thank you Shel, no more violence from this
guy ;-) ) with 180/5 1:1. It is good enough for my purposes.
Naturally, if you can get a one-piece lens that will go 1:1 it is
preferable. I got my Tamron combo at very good price from fellow list
member... I am very happy about it.
Yes, I guess the FA-100 f/2.8 would be better in that respect, and
perhaps the newer version of the Tamron, too. These are both autofocus
designs, though, which you suggested earlier is a drawback... As for the
old 100 f/4, one reason for starting this thread was that I wanted to
know if it would go to 1:1, but like you say in your other thread, it's
probably more likely to stop at 1:2.
Yet another alternative would be the Sigma 105 macro. I saw one
advertised on a local web site a while back, but it's no longer listed ;-(
And remember, on *istD you get extra x1.5 for free.
Boris
