In article <5bt1i9$l0p@newton.pacific.net.sg>, lawrence@nymph.pacific.net.sg says...
>Lee Choong Hsen (fba40151@leonis.nus.sg) wrote:

>: I've been trying to get step up rings in any of the following sizes:
>: 58 -> 77
>: 58 -> 72
>: 62 -> 77
>: .... does anybody have any of the above to verify they exist, and if
>: possible tell me where you go them... ? I've been hunting round my local
>: shops and they say rings are not made to go up over such a wide range..

> I guess the reason is stepping up will definitely risk vignetting so
> the demand is not there at all.

Ummm, you probably mean, "stepping down"..., stepping up is actually
a way to reduce filter/shade vignetting when there is a problem...
B & H in NYC carries many step-ring types, and I have been able to
buy some unexpectedly wide size-conversion rings from them.
Hope This Helps