On Thu, 22 Mar 2001 10:54:14 +0100, "Global-DVC" wrote:

>Have a look at our results with Century Achromatic Diopters for 58 mm thread
>on VX2000 PD150 and TRV20
>at renewed www.Global-DVC.org

Results with most any achromats of the appropriate power
for the job are likely to be fine - and I suspect most
achromats are cheaper than the Century ones...;-)
I use Nikkor 3T, 4T, 5T, 6T achromats, nos. 0, 1, 2
Nikkor close-up lenses (non-achromatic), and a Sigma
52mm achromat (with step up/down rings - with no vignette).
Achromats are made for still cameras in various thread sizes
and powers by several camera and independent mfgrs. -
selecting from among these (about 52mm and larger) will
generally produce fine results...