Interesting images. A few years ago I experimented with the DFA100 and
the 1.7x TC and also found it to be a very good combination. The Kiron
MC7 2x that I also tried was not as good.
The 2:1 macro is very tempting but for me it falls between niches.
I would like to use it in the field where being able to focus from
infinity to 2:1 would be great - but for field work I would want at
least an A compatible lens to allow for open aperture metering and P-TTL
flash. The Venus seems to be K compatible only, not KA.
In the studio I don't care about open aperture metering or P-TTL flash -
in fact the pre-flash on P-TTL interferes with setting up slave flashes
with optical triggers so I usually wind up just using manual flash
anyhow. But then - in the studio the infinity to 2:1 focus range is not
important - the magnification can be customized using tubes, bellows, etc.
Mark
On 4/22/2015 11:30 PM, Igor PDML-StR wrote:
It is indeed a rather interesting lens.
Thanks for posting the info.
As for 2:1, I am thinking about how often it gets practical (for me).
I've used the D-FA 100/2.8 with 1.7x for a few things like a fruit-fly
caught by a spider, etc.
I know that when I tried to stack 2x on top of that it was too much
(and the image was degraded - probably too much glass and it might
also be that I was hitting the diffraction limit from the effective
aperture).
I posted a few photos back in 2007:
http://komkon.org/~igor/PHOTOS/Raspberries/100-2_0x-1_7x/IMGP9608.jpg
http://komkon.org/~igor/PHOTOS/Raspberries/100-2_0x-1_7x/IMGP9609.jpg
The quality of the shots taken with DFA 100/2.8 + x1.7 was reasonable
(you may like or dislike the photos themselves- different people had
different view on the composition,etc.):
http://www.komkon.org/~igor/PHOTOS/Raspberries/IMGP9503.jpg
http://www.komkon.org/~igor/PHOTOS/Raspberries/IMGP9527.jpg
Here is the old message describing those:
https://www.mail-archive.com/pdml%40pdml.net/msg422565.html
So, yes, I would benefit from that lens occasionally.. But not sure, -
how often.
Cheers,
Igor
On 4/22/2015 6:54 PM, Darren Addy wrote:
Tempting indeed. I think that all PK users should get one before the
realize that the cool kids don't make their lenses in a PK mount.
Reading about it, it is also funny how many people think that 1:2 is
the same as 2:1. Pentax made only one macro lens that does 1:1 and
that was the old preset Macro-Takumar. The rest are all 1:2. This
lens
(at 2:1) is 4x that.
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