Wanted No More: 16" mirror

[CoombellKid]

Looking for a 16" mirror and thought I would look here first. Probably not
likely, but dang! I'll give it try anyways. Looking for something with a focal
length around F/4.5 to F/5

So if you have one available, PM me :)

regards,CS

[Shawn]

I have one, A DIY, Cassegrain , with hole, made from a 19th century ships porthole, The primary is Aluminised, or at least was , its been in storage in NZ for years.. Primary is very good, but secondary was lost. In af all things a "boating accident".. It needs someone than can finish the configuration, or make a really long DOB...

Primary was ground by Graham Loftus.. Of Auckland..Ive kept it for sentimental reasons...

Shawn

...

[CoombellKid]

Hi Shawn,

Thanks for your reply, but I'll pass as I'm looking for a mirror for a dob. I
should a focal length, so adjust the original thread.

regards,CS

[koputai]

Hi Shawn,
What is the f ratio of the mirror (or focal length)?
And, as the bishop said to the actress, how much?

Cheers,
Jason.

[Shawn]

The compete assembly was to be F10...Not sure of the primary. The primary was aluminised for working on the secondary , It tested up good... I guess someone here could take an educated guess at the FL of just the primary...I guess it would suitable for a dob, after all the hole is where the diagonal would be...:lol:... certainly help with cooling, the glass was nearly two inches thick prior to grinding...

Hope that helps..

[Satchmo]

The primary would have to be around F3.5 to F4 extrapolating from F10...

[CoombellKid]

No longer looking.

regards,CS