Thanks for reporting on your FR. That is exactly what I've been
talking about. The need for somewhat shorter tubes to better
accomodate imaging gear, but with capability for rigid threaded
extensions to increase tube length for a greater variety of
setups. I think if you image, you will want to get a good
field flattener, especially for larger CCD chip sizes with their
bigger imaging field. I haven't followed all the FF and FR
threads on the new 130, but maybe there is still something out there
that will work with the current 130 configuration. You might
also check with Markus (APM) to see what he might have that would
work. Sometimes your best bet is to get a FF that is specifically
designed for a certain brand of scope or a specific focal length.
Markus may have this, or be able to make one for you that will work
with the backfocus you currently have on the 130.
--- In email@example.com, "jiprovi" <jiprovi@...> wrote:
> I connected an AP 2.7" FR (0.7 reduction) to my brother's (Jason)
TMB130 SS last night.
> Unfortunately it seems the optical tube needs to be about 2"
shorter to allow the CCD camera
> behind the FR to obtain focus (I get close but can't achieve
focus). I was curious about what I
> would see using such a FR and wondered if it would improve the
field flatness. Looks like I
> will be looking at getting a field flattener afterall.