There are a lot of references in the internet about M42 threads for camera-telescope adapters, male and female, external and internal, this is a sample among several others: http://cncsupplyinc.com/trings.htm Carlos 2009/12/4 Maurice M. Greeson <maurice@xxxxxxxxxxx>: > > On Dec 3, 2009, at 6:00 PM, CarlosMFreaza wrote: > >>> Thanks Carlos, > You may be right about the Hasselblad adapter, although looking at a 1980 > Questar price list they did list an adapter for Rollei, but did not specify > which Rollei. And, the Questar adapters for the camera adapter are M42 > thread. So, I am still wondering.... > Maurice >> >> I could see that Questar manufactures extension tubes/adapters to >> couple different cameras to the telescopes, some of these extension >> tubes look very similar regarding your adapter, it has the extension >> tube and the T ring for the camera. They have a camera adapters >> regular list that does not include Rollei cameras, however they do >> manufacture adapters for any camera according the customer specs. >> Anyway some time ago they had included in the regular adapters list >> one for Hasselblad 500 cameras, are you sure your adapter is not for >> Hasselblad? >> >> > > > --- > Rollei List > > - Post to rollei_list@xxxxxxxxxxxxx > > - Subscribe at rollei_list-request@xxxxxxxxxxxxx with 'subscribe' > in the subject field OR by logging into www.freelists.org > > - Unsubscribe at rollei_list-request@xxxxxxxxxxxxx with > 'unsubscribe' in the subject field OR by logging into www.freelists.org > > - Online, searchable archives are available at > //www.freelists.org/archives/rollei_list > > --- Rollei List - Post to rollei_list@xxxxxxxxxxxxx - Subscribe at rollei_list-request@xxxxxxxxxxxxx with 'subscribe' in the subject field OR by logging into www.freelists.org - Unsubscribe at rollei_list-request@xxxxxxxxxxxxx with 'unsubscribe' in the subject field OR by logging into www.freelists.org - Online, searchable archives are available at //www.freelists.org/archives/rollei_list