Helicoid for EL-Nikkor 135mm 5.6A & 63mm 2.8N

[Bern]

I recently had the opportunity to buy these two EL-Nikkors. The seller did not want to sell them separately but only wanted about USD 60 (including shipping) which I thought was not a bad deal.

I have been trying to look for what length of focusing helicoid to use for these but to no avail. I've read that a bellows would work but that would make the set up big. Is wishing for a helicoid that can go 1:1 or 2:1 be a long shot?

Any recommendations?

Here is a snap of the EL-Nikkor

Thanks everyone!

[Dr Klaus Schmitt]

Read about that here on my site: https://photographyoftheinvisibleworld.blogspot.com/2011/01/how-to-determine-length-of-focusing.html

Not complicated, get a) a M39-M42 adaprer ring as such enlarger lenses have that Leica (M39 x 26tpi) thread mount and b) get a M42-Nikon adapter ring for the camera side, c) get a suitably long (i.e. according to your magnification needs) M42-M42 helicoid from ebay. DONE

[Bern]

Read about that here on my site: https://photographyoftheinvisibleworld.blogspot.com/2011/01/how-to-determine-length-of-focusing.html

This is the information I was looking for. After opening your blog, remembered reading it a few years back when I was interested with a 75mm Apo Rodagon D(R) enlarging lens. Just didnt know how to find it again.

I found a technical description for the EL-Nikkor 63mm that listed a flange focal distance information (55mm). Is this the same as the register length mentioned in your blog?

Really appreciate your taking time to reply to my initial post.

[Dr Klaus Schmitt]

Yes "register length" is flance-focal distance indeed!