Differences between Rokkor lenses.

[ferny]

Uselessdreamer1's post reminded me of a question I've been meaning to ask for a while. Does anyone know what the differences between the following lenses are, if any?

MD Rokkor-X 50mm 1:1.7
MD Rokkor 50mm 1:1.7
MC Rokkor-PF 50mm 1:1.7
MC Rokkor-X PF 50mm 1:1.7

I know the difference between an MD and a MC, but what does X mean? I assume it means it's the higher end lens? The one for professionals? I think the PF has something to do with the number of elements, but can't remember. I can't find a site that tells me either. :?

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[Hertz van Rental]

Here might help but the site isn't responding for me at the mo

http://www.rokkorfiles.com/

[ferny]

Yeah, I found that a while a go. But as luck has it, nothing or very little of my stuff is on there. :?

It's not working for me either right now. I'll take a look at it later though. Cheers.