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EP dust cap/plug source?

Posted: Sat Jan 04, 2020 4:00 am
by Chich
Is there a reasonable source for these? I just had a look on Amazon and they are asking upwards of $40 for a set of ten 1.25" caps or 4 2" plugs. At these prices it would almost worthwhile to haunt the SallyAnn and buy up old binos for their caps if they'd fit.

I would imagine that there is a viable substitute lurking in the aisles of a hardware shop, industrial supply or sumsuch. I just have not been able to find one.

Thanks for any thoughts.

Re: EP dust cap/plug source?

Posted: Sat Jan 04, 2020 4:03 am
by Lady Fraktor
https://agenaastro.com/catalogsearch/re ... ust%20caps

But being in Canada I would email All-Star in Alberta, KW (Perceptor) in Ontario or Ontario Telescopes they may be cheaper.

Re: EP dust cap/plug source?

Posted: Sat Jan 04, 2020 4:26 am
by notFritzArgelander
Lady Fraktor wrote:
Sat Jan 04, 2020 4:03 am
https://agenaastro.com/catalogsearch/re ... ust%20caps

But being in Canada I would email All-Star in Alberta, KW (Perceptor) in Ontario or Ontario Telescopes they may be cheaper.
Yup. Agena is my prime source of such things.... Exchange rate problems might be an issue.

Re: EP dust cap/plug source?

Posted: Sun Jan 05, 2020 12:00 am
by ARock
Ebay is also a good source, but I prefer Agena as they mention the outer diameter which is important for the eye side cap of the eyepiece which is not 1.25" or 2" depending on the eyepiece.
https://agenaastro.com/agena-plastic-en ... ellow.html

Lately 3D printable eyepiece caps have been showing up on thingiverse where you can just download and print when needed, especially if your neighborhood public library has a 3D printer for public use. Some of them are customizable, ie come with a cad file as well

https://www.thingiverse.com/thing:3134224

The one above has a scad file which you can open up in openscad (free) and edit some numbers to fit your particular eyepiece, generate a stl file and take it to a 3D printer . I have not tried this yet, but plan to, the next time I need a cap which has a non standard size.

Re: EP dust cap/plug source?

Posted: Sun Jan 05, 2020 11:39 am
by OleCuss
You can get quite a collection here: https://eyepiececaps.com/

For items I could not get through them or other sources I've at least once gone to McMaster-Carr and gotten a silicone cap there. Never underestimate McMaster-Carr!