How to attach filters to Ysarex 127mm?

[Matt_Bigwood]

I've just bought a Razzle with a 127mm Ysarex, and wondered if anyone could suggest a way of attaching filters as the lens doesn't have a filter thread?

I shoot black and white and would like to use a yellow filter and a lens hood.

Thanks

Matt

[Mark Sawyer]

The old Series filters come to mind. They had a slip-on filter holder that attached to the front of the lens without using the threads. I don't know if it would fold up inside though.

Or you could glue a step-up ring around the front of the barrel, with the same caveat about folding up inside...