Objective M27 thread extension

[Mindwarp]

Hello Gang,

I’m searching some objective M27 thread extension tube (15 or 16 mm). Some idea/links for a good cheap source as I didn’t found some in Ebay.
Thanks you all.

[Scarodactyl]

That's not a very popular thread--all I can think of are Nikon CF infinity bd objectives. You might need to have this custom made.

[PeteM]

It would be clunky and expensive, but there are M27 to RMS and RMS to M27 adapters. You could cobble together something with a short RMS parfocal adapter in between.

Some of the Lomo stuff is M27 - might be something there.

If you're planning to do this with more than one spacer, as Scarodactyl suggests, it's likely best to get someone with a metric threading lathe to make up a few.

[Mindwarp]

Thanks you both of you Scarodactyl and Pete.
I’m asking that as I received a beautifully Apo objective for Axiomat. So the thread part on the objective is not on the top but 1/3 down, and there is a huge upper protubing part that needs to be covered by an extension tube.

I did something with tape + plastic tube, but I’m looking for something more clean and permanent.