300mm f2.8 IS, Polariser Question

Will the old drop in polarizer filter (PL-C) for the non-IS 300 work in the newer IS version when used with a Mark II body (1.3x crop).
I understand the newer polarizer for the IS version is larger.
I have used the old polarizer on a new IS 300 with the D60 and not seen a problem.
I was wondering if it will be a problem with the Mark II or just with full frame sensors.

Cyber, Pekka...anyone....help me out!!

GenEOS:

I don't know the answer, but by reading the description of the new CP drop-in filter, it doesn't sound promising:

I have the filter, but don't have a non-IS lens to try it with. I do know that the drop-in filters for FD lenses were 48mm, so possibly they were the same with the non-IS EF lenses, too.

Don't know. Hopefully somebody that does will see this and give you the answer.

Sorry.

48mm filter does (should) not fit to IS lenses. You need 52mm.
I do not think the reasons are in digital camera crop factor.

http://www.bhphotovide​o.com …ails&Q=&sku=186​093&is=REG

I think he was hoping that with the smaller image format the 48 mm filter wouldn't vignette the 300 on the 1D II. Whether it would would depend on two things:
1) Does the 48 mm C-POL holder still center on the 300 IS?
2) Where in the light path is the filter located (if it's internal, where the various lens elements are expecting a 52 mm diameter free light path, it might act as an additional diaphragm, further reducing light; if it's outside the lens' optical path, is it far enough outside that that a 48 mm diameter opening can pass the resolved image)?

Pekka, I shot this combo with a D60 and it worked fine, I did not notice a problem. I only recently thought it may be a problem, because a friend has upgraded from non-IS to IS big primes. On his 400 and 600 the old PL-C fits, but blocks a portion of the lens on his film bodies, like a vignette of sort. Since the D60 has a much smaller sensor than a full frame, I used it without problem. Now I am wondering if the Mark II's larger sensor will "see" the edge of the smaller filter or not. I know the fix is to buy the new one. But, if this works beause of the size of the camera sensor, I can save some bucks...like 75 of them, by buying a used filter. I was hoping someone here may have tried this already.... I am needing this for knocking the glare off of windshields in mid-day sun at an upcomming race, it worked like a charm last year with the D60.

I tested this tonight with the older drop in polarizer. Strangely, it is the same size glass as the one that came with the lens. It works fine. No problem with blockage, fit etc.

Was the old drop in for the non IS 300mm 48mm? I thought it was 52mm as well.. and thus there would be no problem at all?