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Posted by Bill Farnsworth on 03/09/06 16:19
"Frankie" <frankieplus@optusnet.com.au> wrote in message
news:1141899708.959313.13940@i40g2000cwc.googlegroups.com...
>I just bought a new lens. The Canon 6.5x12..
>
> I want to put a UV filter on it to protect the lens and have 2 main
> questions.
>
> Does the filter go on the 82mm thread directly on the lens or is it
> better to put it on the
> 105mm thread on the lens hood? Which is best or doesn't it make any
> difference?
>
> Also, I tried screwing in a filter on the 82mm lens and it really
> doesn't screw in nicely, It's as if it needs some lubrication. It
> -does- screws in but squeeks as it does so and you can really hear
> the
> metal rubbing together, then I'm too scared to tighten it a bit
> more,
> is this normal? What could be wrong here? I tried it with a hoya
> filter
> that has an 82mm thread and now I'm thinking that maybe the tiny
> space
> between the threads are different?
>
> I mean we're not talking nuts and bolts here that have different
> guages
> right? A filter is a filter and if the lens is 82mm and the filter
> is
> 82mm it should work right? Or am I wrong?
>
> Could there be different guages of 82mm threaded filters or are they
> all the same thing?
>
> Any help appreciated.
>
>
> -Frankie
Either way works just fine, Frankie.
Unless the lens shade doesn't slip over the filter if the filter is
attached directly to the lens. The rental houses I work with puts a
filter on the lens shade.
However, if you put your clear filter on the lens shade you may have
to remove it when you use correction or effects filters on the lens.
Reason being, the distance between the two pieces of filter glass
might result in double images. This happens with matte boxes when a
strong back light hits the lens. Flagging the lens helps, but
sometimes you just can't put the flag where it needs to be.
The tight fitting filter on the lens can be resolved. The problem
could be with the thread cut angle on the lens or on the filter. Or,
the machining edges still have burrs. Try a different brand of filter.
If that doesn't work then carefully buff the threads on both the lens
and filter with a chamois. Swab out the valleys with lens cleaner, but
don't get cute and use a lube like WD-40. This will only attract
dust.............. right where you don't want it.
Good luck.
Bill F.
www.billfarnsworthvideo.com
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