The latest ones are single lens while the `5 yr old ones are 2 or 3
lenses...
73
hank wd5jfr

"donutbandit" wrote in message
...
"Henry Kolesnik" wrote in
:

I have: 3", 3.5", and 4.75" in diameter.
hank


If they have decent achromatic qualities, they could be used to make a
short focus refracting telescope. I'm sure the focal length is quite
short,
though.

I've never seen one. More than one lens inside?