Interested in a few recommendations for a DSO astrograph. OTA shouldn't weigh much more than 20lbs but lighter is fine. Should have full-frame coverage. Will not be in an observatory. Will be driven/flown to various dark sky locations.
Entry level recommendations not needed: looking for more of a 'forever' scope.
I was also interested in a very high quality Astrograph.
I have been imaging with a Doublet, (successfully) and therefore immediately considered a Triplet, but then wondered about the potential advantages for imaging of a Quadruplet.
Mr Kennedy iDClimber brought the FSQ-106 to my attention, and Bob25Eq also recommended it. thanks Dave & Bob
I read a few months in the Refractors forum, and discovered a bit of a consensus as to the Quality of Takahashi and AstroPhysics
scopes, which are generally regarded as being number 1 and number 2, but in no specific order. they are viewed as being equal.
Astrophysics are just about impossible to obtain, and you can go in a lottery, and perhaps get one if you are lucky.
Takahashi are incredibly expensive , but can be obtained.
for imaging and full frame the Takahashi FSQ106 Quadruplet is often regarded as the premier scope, and has the advantages of being
able to be used at multiple Focal lengths, and F Ratios.
for example it is native at 530mm (good for many targets) at F5, and using a 1.6x extender it can be 848mm focal at F/8.
this makes it potentially a very useful choice, and opens up more target availability.
there are also 0.73x and 0.60x Focal reducers available, that bring the focal length down as low as 386mm or 320mm respectively
and F Ratios as low as F/3.
based on all this excellent information I decided to purchase an FSQ 106.
the question then became, if I should buy a new one with Non Fluorite Lenses, or if I should try an obtain the original Fluorite version. as I am a bit of a collector of OLD things (audio equipment) I decided a Fluorite original would be my choice.
I was fortunate to find a Fluorite FSQ106 in Japan and despite the obvious challenges purchased the Takahashi.
Fluorite is written on the front objective, so no confusion exists there.
the original Fluorites also have a non retracting lens hood. there was a later version the FSQ106N that has a sliding lens hood.
I will update everyone with some actual imaging results, once I dial the scope in, and possibly buy a bigger and higher quality mount.
sorry for the long post, but I hope this information is helpful.
Edited by Spaceman 56, 28 May 2023 - 05:10 PM.