Yes. I agree there is color
I've owned 3 , it's a 30yr old lens & coatings. 30 yr old Design & tech
I've seen the Blues & purples & yellows. I've seen pixs with the color. I've also seen pixs without. On Luna color is really trippy. Sweeping the stars not so much
What I'm saying is , the 3 I've owned// own there's color for sure
Better glass// coatings now a days ,sure I agree with you
I just don't think it's so horrible as some folks post .TV sold a lot of them
when using it for rich- field Use such as sweeping around where the color deficiency counts for almost nothing
& the scope is ,as you say tack sharp.
Semi-Apo ,,I never heard that applied to the Pronto. I started to hear that catch phrase when TV introduced the "85
All in all its still gets press 30yrs later..
If one can't see violet/blue well, then perhaps. A friend of mine had one when they were new (Ranger version.) It had substantial color, much more than I expected when I first looked through one based on the hype at the time. Made me very skeptical of short refractors being touted as semi-apo, etc. for two decades. It was sharp otherwise, but not close to the color correction of ED doublets over the past dozen years or so, not even FPL-51 equivalent--which shows obvious color in some configurations like my 110 f/7.
But the Pronto is a sharp small achro w/2" focuser that is well set up for rich field and would still have enough value to replace the objective, despite the color. Jeff already has his Pronto, so he will already appreciate how much or how little color there is.