Originally Posted by GetGray
madshi: Here is a foolproof formula to calculate the TR. It's what I recommend everyone use. It takes the 1.78 or 2.35 question out of the equation, literally.
TR= (d * 0.5625) / h
where d is the distane to your screen from the Projectors owm (prime) lens
h is the height of your screen.
Use the same units for d and h
Example: 54" tall screen, 12' from PJ
TR = 144" *0.5625/54" = 1.5
Just what I needed, that clears up any confusion - thanks!
So my personal throw ratio is 1.85:1. Phew, that's good news!
Originally Posted by coolrda
The old saying "you get what you pay for" never rings more true than when an A-Lens purchase is considered. I bought my first lens before the Isco IIIL was around. Knowing what I know now wouldn't consider anything but a true Cylindrical lens. I'm so glad I paid the difference to step up to my Isco. Many times I've tried to save a buck only to repurchase the better product at twice the price later. From now on I can concentrate on Projector upgrade and not second guess my A-Lens purchase.
Yeah, I understand. However, if you look at some of the comments in this thread, it might make sense to wait a little:
Alan Gouger: "Another cylinder lens is about to enter the market. [...] Top performance. Should put a dent in the market."
Aussie Bob: "I understand that at least one these two new lenses will be a lightweight, low-distortion, 5-element design, arranged in 3 groups, which is a much-needed improvement on the traditional Schenider/Isco (and other) 4-element, 2-group designs"
To those in the know: Will those upcoming lenses be able to compete with an ISCO IIIL with a 1.85 throw ratio with a 0.95" chip DLP projector? Or are those new lenses too small for such a setup?