It weighs 4.65 pounds with the dovetail and rings. We will not have an 80mm doublet. I can't justify the 8mm difference in the line and prefer the jump to a triplet. We have tried same sizes in different optical configurations in the past and it would lock customers up to the point of not purchasing anything.
In that case, any plans for a doublet somewhere between the 80 and 115 mm triplets?
Not at the moment. We have another project we are getting final quotes on at the moment. I have a TMB designed 107mm FPL-53 doublet we had looked at, but the odd glass size was causing an issue getting blanks which made the price very high.
Sort of. Roger Ceragioli went over the original TMB92 lens design and optimized it using glass that wasn't available 10 years ago. Roger's optical knowledge is truly legendary, so I can't wait to see the optic if we can get it done. We can't call it a TMB as it is a collaborative effort. IF, big if, cost can be held in check we would call it an AT92.
Wow an AT92... just saying if you do come out with one I will be ordering. I absolutely love my AT115.
It will be a much different animal than the EDT series. We are looking at FPL53 or FCD100 center element with a lanthanum rear element, f/5.5 like the original, 90mm tube like the light version, 2.5" focuser, .96 strehl or better, 1/6th wave or better. It will be the same great performer the TMB92 is, just packaged a little differently.