Porst 55mm 1:1.4 as a macro lens

[D1N0]

I put it on a 3cm extension tube. Shot at F1.4,2.8,4,8,16 Pentax K-1

1.4
Porst 55mm 1:1.4 as a macro lens by The lens profile, on Flickr

2.8
Porst 55mm 1:1.4 as a macro lens by The lens profile, on Flickr

4
Porst 55mm 1:1.4 as a macro lens by The lens profile, on Flickr

8
Porst 55mm 1:1.4 as a macro lens by The lens profile, on Flickr

16
Porst 55mm 1:1.4 as a macro lens by The lens profile, on Flickr

Cosina made version of the Tomioka 7/5 55mm 1.4 I was curious if it was similar to a Planar but I guess not. Not one for copying slides and only gets acceptable sharpness across the frame at F16

[martinsmith99]

That 1st shot.....Gosh!

That's quite something. The distortion is quite pronounced.

[D1N0]

Yes and distortion is still there at F16 even though it looks sharpish. Also near impossible the focus on the corners wide open. It's just always distorted.

[caspert79]

Well, it's clearly not a macro lens.

[D1N0]

The reason I tried is because the 5/7 design seems to be related to the Carl Zeiss Planar a 7 element double gauss with 5 groups where the center elements are two doublets. Obviously the lens is not very Planar at macro focusing distances.