|
decisions...decisions...
Agree, move on your instincts Steve. If you’re happy with the WO, just go for it.
The APO Petzval design is marvellous (also used in the Televue NP and Tak FSQ), but keep in mind it is optically different to an APO triplet.
Perhaps the important point is to make a decision based on your own research, not the view/opinion of others. My goal, and that of many others who contributed to this thread was to provide as much statistical data as possible so people like yourself can make an informed decision. No just an opinionated one.
I’ve attached two longitudinal chromatic aberration graphs for the AP130 EDF’s made by AP. This provides a comparison to the other information provided. I’ve only included these to validate the WO seller’s opinion. You can pick the AP 130’s on the seconds market for around US$6,000. They don't last long and sales are rare.
As luck would have it, there is one being auction on Astromart now. It has 4 days to go and is up to US$4,400. Don’t think it will last long. Beside it is a second hand AP 160 EDF also going to auction for US$11,100 (11 days to go), which is incredible considering a new AP 160 EDF straight out of the factory costs US$8,950. Talk about return on investment. This is a testament to the quality of refractors made by Astro-Physics.
|