R: R: [William Optics] Re:Evaluation of the Reducer/Flattener III
- Hi Sander,
what i means is that in my example the distance of the SVF-M25C CCD to the T2 thread (present on the camera) is 17.5 mm.
According to the TRF-2008 (also the FR-III ??) backfocus ( http://www.televue.com/engine/page.asp?ID=237 bottom of the page ) 56mm, this means that i need 38.5 mm spacing from the CCD T2 to the flattener shoulder.
I intend this way....... :-)
Is it right ??
Da: William-Optics@yahoogroups.com per conto di Sander Pool
Inviato: mar 01/09/2009 16.33
Oggetto: Re:R: [William Optics] Re:Evaluation of the Reducer/Flattener III
I'm not sure what you mean but what I was trying to say is that distance
between the actual CCD and the flattener/reducer lens is critical.
Flatteners such as the TRF-2008 and FR-III are made so that when used
with DSLRs and a T-ring the distance is around 55mm. I've found that
55mm spacing to be incorrect for my scope. I bought adapters to get my
FR-III at precisely 55mm (from lens to CCD) and that did not give good
results. With the TRF-2008 the correct *extra* space was 21mm which
makes the total around 43mm.
Hope this clarifies things. Probably not :)