[multiweb (Marc)]

Originally Posted by Dennis

Hi, Marc

If you mean SMC Pentax-M 200mm F4, it looks like 52mm according to this website:

http://www.pentaxforums.com/lensrevi...duct=75&cat=27

Cheers

Dennis

Thanks Dennis. Yeah I suspect I need a 52mm to 48mm compression ring. I've found one on eBay and sent a question to the seller just to make sure it fits the lens.