> From: "John Petrush" <jpetrush@xxxxxxxxx>
This is probably a naive question, but why don't they get a step down
ring from 77-72? No such animal or some other reason. I only use
55mm filters with a step down ring to 49mm when required.
Giles
> Yes, the center filters are available in 77mm, and prices range from $US150
> to $US500. One of the tricks astrophotographers use for odd-sized filters
> is purchase the next size larger for what you need, and a plain, cheap UV or
> skylight that is the right size. Have the needed filter trimmed to the
> right size (a shop that does stained glass is reportedly a good place to
> take them) and fit into the UV cell. Voila! 72mm center grad filter.
>
> John P
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