Caps are sometimes marked with 'their' actual size rather than the
filter size - thus a push-on cap for a lens with 58mm filters may be
marked 60mm as that is the cap's actual internal diameter. Canon did
this. Leica uses odd sizes of course (inc. 60mm but that the red spot
for you).
If it's marked 86mm and it's a push-on, then the lens may take 82mm
filters (4mm allowance for the actual diameter of the external
barrel). If it's a clip-in, the lens may take 87mm filters (1mm
allowance for the thread depth).
Andrew Fildes
afildes@xxxxxxxxxxxxx
On 20/03/2007, at 8:08 PM, Moose wrote:
> Andrew Fildes wrote:
>> Standard sizes are 77mm, 82mm, 87mm, 92mm. Sounds like it's 87mm
>>
> Nonetheless, the cap on mine is marked 86mm and fits perfectly.
>
> Moose
>
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