That page misses one option (one that I only became aware of recently).
Tamron also made an Adaptall2 *Extension Tube* specifically for the SP
90/2.5 that will get it to 1:1.
The obvious benefit to the tube is that you don't lose the two stops
of light that you would with the 01F teleconverter.
On Fri, Jul 13, 2012 at 01:48:33PM -0500, Darren Addy wrote:
That page misses one option (one that I only became aware of recently).
Tamron also made an Adaptall2 *Extension Tube* specifically for the SP
90/2.5 that will get it to 1:1.
The obvious benefit to the tube is that you don't lose the
Hmmm. Looks like I need a bit more education on this subject. (Thanks John!)
What most people will agree on is that the (optics-less) extension
tube will do less image degradation than anything with another optical
element (although the Tamrons are considered high quality in that
area).
The
On Fri, Jul 13, 2012 at 2:42 PM, John Francis jo...@panix.com wrote:
The laws of physics suggest you are mistaken here; if you spread the
light energy out over a larger area it's not going to be as bright,
no matter how that spreading is done. You'll lose a little bit of
the light with an
On 13 July 2012 22:40, Darren Addy pixelsmi...@gmail.com wrote:
On Fri, Jul 13, 2012 at 2:42 PM, John Francis jo...@panix.com wrote:
The laws of physics suggest you are mistaken here; if you spread the
light energy out over a larger area it's not going to be as bright,
no matter how that
Eric,
I think you misunderstand the table (or perhaps the table words it inelegantly).
When the table says 1 focal length extension tube you are thinking
the same focal length as the lens (50mm lens = 50mm extension tube).
However, what it *means* is the amount of extension needed to go from
1:2
On 13 July 2012 23:50, Darren Addy pixelsmi...@gmail.com wrote:
Eric,
I think you misunderstand the table (or perhaps the table words it
inelegantly).
When the table says 1 focal length extension tube you are thinking
the same focal length as the lens (50mm lens = 50mm extension tube).
That page misses one option (one that I only became aware of recently).
Tamron also made an Adaptall2 *Extension Tube* specifically for the SP
90/2.5 that will get it to 1:1.
I think that's the first on the list.
http://home.comcast.net/~tmoreau2/dyxum_90mm.htm
Or is there another?
--
PDML
Oops. Forget me. I forgot how to read.
--
PDML Pentax-Discuss Mail List
PDML@pdml.net
http://pdml.net/mailman/listinfo/pdml_pdml.net
to UNSUBSCRIBE from the PDML, please visit the link directly above and follow
the directions.
all I can add is that I have owned both the 49mm and 55mm front thread
versions of the manual focus 90mm f2.5 tamron macros and without tubes
they are both superb lenses...
-
J.C.O'Connell
hifis...@gate.net
-
-Original Message-
From: pdml-boun...@pdml.net
10 matches
Mail list logo
