I am new member but have lurking and reading for some time.
I am having trouble finding a FF/FR to work and focus with my scope (it’s actually a Saxon branded one but for all intents and purposes it is identical to the Es 102mm triplet with FCD 100 glass.
The astroshop that I bought my stuff when I first got my gear a year ago ordered this ES 0.7 FF/Fr which was supposed to work. It’s a giant piece of glass designed for 3 inch tubes but via a series of adapters it connects to a two inch focuser tube and m42 thread to the dslr.
However after a year of trying I haven’t been able to take a single picture with it that is in focus.
I can take pictures without it via my DsLr at prime focus and that works (after some extension tubes) but with it none.
So I figured that it must not be designed for this F/7 despite what I was told.
So after research on a few forums it seems that this actually doesn’t work for this scope. Then I’m left with finding a replacement.
The problem is most threads then do not conclude what they actually ended up using and whether it worked.
I know the Trevor for AstroBackyard has or had essentially the same scope but similar just this one uses the newer fcd100 glass. Altair Lightwave 0.8X Reducer/Flattener Is the combo he uses.
It’s hard to find that here in Western Australia and I want to make sure I have the right one before I order and wait a few weeks and it still doesn’t work.
I have seen a few options the
1) stellarvue 2inch 0.8 ff/fr designed for
There f/7 refractors at 714mm seems to be suitable
2) skywatcher 0.85x ff/fr might be ok and a similar one from Orion
And apart from that I’m stumped.
So can anyone kindly suggest something that would work well with this scope and the necessary adapters if any to connect the thing to a 2inch focuser tube. I have the t ring for Nikon which I use a d7000 on . I can connect to m48 or m/42 with an tiny adapter and it works well and I get exactly 55mm back focus to image plane.
It’s very frustrating I’ve tried all sorts of extension tubes all the from none to 18cm to no avail.
Edited by astroboyabdi, 09 December 2019 - 06:50 AM.