Let's see if i have understood everything correctly.
With lenses of PCV -25 and PCX 75 focal lengths, you get a ratio of -75/(-25) which is 3
The distance between the two lenses should be equal to 75 and the distance of the "apperture" (i.e last bounce mirror, pbs, waveplate etc) from the first lens of the telescope must be 25
correct?
"its called character briggs..."
What are you using as isolating compound? Does it have good thermal conductivity, or is the heat also being isolated from the mount and therefore not dissipating properly? I use 2 piece sandwich mounts with the bore being 0.2mm bigger in diameter of the diode collimator, the collimator cylinder gets a 1 layer wrap of special isolating thermal foil of 0.2mm thickness giving a snug fit and excellent heat dissipation. No drift issues due to lack of heat dissipation in the collimator!
Just to add my 2 cents, using Dave's brass diode blocks, with no insulation required (diodes in parallel with Flexmod P3 high side driver) I experience no drift or wandering alignment at all. Period.
This space for rent.
Finally someone who is sensible
thanks for the input on this one!
although there is a minus in the formula in this page http://www.edmundoptics.com/technica...eam-expanders/
the other minus is my own notation to stand for a ... reversed telescope!
ha ha ha ha ha ha ha ha ha!!!!
"its called character briggs..."