Hi,
I've posted this question before but here it is again in what I think is clearer language.
This is probably a silly question but here goes. From what I understand, one of the reasons that apo's cost so much is because the glass used is very expensive and much harder to make properly as the diameter increases. I was wondering, since three glasses are used in a triplet, why can't two of them be placed at the front end of the tube and the last one at the end of the tube. At the end of the tube the light cone is much smaller. When the cone reaches, say a diameter of 1inch, put a baffle there. Instead of leaving the center of the baffle empty place the expensive glass there and have it permenantly aligned with the front two elements. Since it hasn't been done (except with the chromacor, which needed constant alignment and is no longer sold because of that issue) I'm assuming that it can't. My question is why not?
Clear Skies
Itz
I've posted this question before but here it is again in what I think is clearer language.
This is probably a silly question but here goes. From what I understand, one of the reasons that apo's cost so much is because the glass used is very expensive and much harder to make properly as the diameter increases. I was wondering, since three glasses are used in a triplet, why can't two of them be placed at the front end of the tube and the last one at the end of the tube. At the end of the tube the light cone is much smaller. When the cone reaches, say a diameter of 1inch, put a baffle there. Instead of leaving the center of the baffle empty place the expensive glass there and have it permenantly aligned with the front two elements. Since it hasn't been done (except with the chromacor, which needed constant alignment and is no longer sold because of that issue) I'm assuming that it can't. My question is why not?
Clear Skies
Itz
