Mamiya-Sekor C 4,5/180mm can't go closer than 1 meter

Joachim Zettl · Aug 7, 2015

Recently I bought a Mamiya-Sekor C 4,5/180mm on ebay. Now I wanted to make a closup with my RB67 and discovered that I can't focus when I am closer than about 1 meter. My 90mm K/L can go much much closer.

Is that how it is supposed to be?

mweintraub · Aug 7, 2015

I found this here
http://www.mamiyaleaf.com/assets/files/documentation/RB67_Pro-S_v7.pdf

It says that the closest it can focus is 84.7cm.

film_man · Aug 7, 2015

For a particular bellows extension how close you can focus depends on the focal length. The extension with the bellows is fixed so the longer the focal length the further away the minimum focus distance goes.

Neil Grant · Aug 7, 2015

Joachim Zettl said:
Recently I bought a Mamiya-Sekor C 4,5/180mm on ebay. Now I wanted to make a closup with my RB67 and discovered that I can't focus when I am closer than about 1 meter. My 90mm K/L can go much much closer.

Is that how it is supposed to be?

Yep, that's how it's supposed to be. For any given amount of bellows extension, a shorter focal length lens will always be focused closer. You'll find the 50 will go right down to 1:1 - but the image quality may not be vey good at that distance. If you want closer focusing you need to get yourself tube no 1.

Joachim Zettl · Aug 7, 2015

Phanstasic! Thanks for the help. That's all new to me. No tube for me at the moment – I have enough to do with all the stuff I need to take a single picture with this brick of a camera. ;-))

John Koehrer · Aug 7, 2015

The Mamiya site has complete manuals for their cameras.
Mamiyaleaf.com

Joachim Zettl · Aug 10, 2015

John Koehrer said:
The Mamiya site has complete manuals for their cameras.
Mamiyaleaf.com

Thanks, you are right and I admit, that I haven't done very much research before I was asking my question.
On the website are not many manuals for lenses though.

polyglot · Aug 10, 2015

If you want high magnification, the 140/4.5 K/L with extension tubes is your best option for RB. It has a floating element that allows it to operate at very close focus without introducing aberrations.

Mamiya-Sekor C 4,5/180mm can't go closer than 1 meter

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