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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