Slim filter w/ front threads besides Hoya PRO1?

[Travis Ingle]

From what I can tell the B+W slim filters do not have front threads and the Hoya PRO1 filters are the only ones I can find that are thinner than the standard filter but still have front threads. Is there anything else out there that I am overlooking?

Thanks

[Bob_McBob]

B+W F-Pro

[Travis Ingle]

I ended up going with the Hoya filters. It looks like the B+W F-Pro is 4mm thick and the Hoya Pro 1 filters are only 3mm thick.

[Double Negative]

Heliopan! They used to have "slim" and "regular" filters but a year or two ago they switched over to all being of the slim variety... And they have front threads for lens caps and other filters.