Meade filter threading

Martin Brown wrote:
wrote:

I won a Meade filter at RMSS (great event, guys!). The issue: I have
no Meade eyepieces. I have a Sirius and a Televue. I read in
"Astronomy Hacks" that Meade threads their filters and eyepieces
different from other companies.

However, I tried the filter, and it threaded smoothly onto both my
eyepieces.

The only manufacturer that produces non-standard threads on eyepiece
filters that I know of is Lumicon. And they don't intend to, but since
they seem to use monkeys with thread chasers to cut threads it is
invariably crude, undersize and a very sloppy fit. I have seen some
that could even fall out of a generously threaded eyepiece if used in a
Newtonian.

You would think that would answer my question about the threading
issue, but I'm curious if anyone has any knowledge of this? Did Meade
once thread their filters differently? Do they still? If so, how come
they thread so nicely on my non-Meade eyepieces?

I don't think they ever did thread differently to anyone else.

It is interesting to note that old 48mm (not a typo) filters for camera
lenses will fit 2" eyepieces very nicely. It's a size that is out of
fashion now in photography so if you keep your eyes open they are very
cheap. And conversely if you can find an X to 48mm adaptor you can put
a 2" light pollution over the front of a camera lens.

BTW Did you really mean to post this to sci.astro? You would get more
answers in s.a.a (and heaven knows we could use more astronomy threads
in there).

Regards,
Martin Brown

Yeah, I should have posted to s.a.a. Suppose I'll do that now.