extension to get 1:1 for makro planars?

[mikmik]

practical technical question: what should be the size of extension tube for makro planar 50/2 and makro planar 100/2 to get 1:1 magnification? is it 25mm for 50/2 and 50mm for 100/2? thanks for answer.

[klaju]

That is about true. I asked Zeiss in Germany this question a couple of months ago and I got this answer.

[mikmik]

thanks!

[bkapella]

The answer did not seem to come through -- could you repost please? Thanks.