This post was inspired by Bill's post "Where has all the love gone for the TV 85".
Back in the day when color free optics were a rarity in short focal length telescopes, the Pronto was a real contender in the category. Now they sell for half price of their initial price. They have been discontinued for years now and I firmly believe they will become very collectible over time for the following reasons.
Firstly, I was not pleased with the amount of CA on bright objects. As a daytime spotter is has a noticable purple tinge on tree branches in the distance on the right side of the limb. The Moon CA was very noticable as well but the view was still wonderful due to the optical quality. I soon forgot about the fringe and just enjoyed the view.
However, this is not the purpose of the Pronto. It is not great for planets, although capable, due to the short focal length. Where the Pronto shines is on star clusters and wide field viewing. The field is pretty flat and the robust focuser can handle my large 31mm Axiom LX. I have no other small refractor that can manage this feat with such ease. I recently traded one of my Pronto's because I recently bought an 80mm, but I will always have at least one Pronto due to it's rich field capabilities.
I have always lusted for a TV85, since it can do everything pretty well and for visual use is virtually color free like my TV102, but the prices are high and they are highly sought and sell fast. The Pronto is able to perform the wide panoramic views like the TV85 at a great price comparatively.
The Pronto is a great companion to my Questar since they both excell in different arenas. My Questar is color free and can operate at high magnification while the Pronto takes care of low mag and wide vistas.
If the color does become an issue in your viewing pleasure, a Baader Semi-Apo or Fringe killer tames it nicely. Mine rides on a Porta and has given me as many pleasurable hours as my other telescopes combined. The 12mm Radian is my favorite eyepiece in this telescope for whatever reason.
Please post Pronto Pics!
Edited by bulletdodger, 28 January 2021 - 09:06 AM.