Quote:
Originally Posted by ausastronomer
Hi,
The Starmaster and Tectron both use a similar design whereby the UCA nests into the mirror box. The Starmaster also uses a whiffletree mirror cell where the mirror and cell come out of the telescope for transportion.
The SDM scopes are based on the Obsession design (Kriege) and the UCA cannot nest into the rocker box. The mirror should also be transported "in the telescope". The mirror cell is designed for this.
There are arguments in favour of both designs.
The major difference is the Obsession uses outboard mounting of the truss poles, where the Starmaster uses inboard mounting of the truss poles. While this design enables you to nest the UCA inside the mirror box, it unfortunately necessitates the mirror box and the rocker box be designed physically a lot larger for a given aperture of telescope. They may look small in the pictures but they are larger and heavier for an equivalent aperture than the Obsession design, by about 10% to 15%. ie a 15" Obsession is smaller and lighter than a 14" Starmaster. Another negative, for me anyway, of the Starmaster design is I dont like fiddling with truss poles and pole clamp hardware inside the mirror box right above the mirror in the dark.
I have used both designs and prefer the Obsession design, notwithstanding the UCA does not nest into the mirror box..
Cheers,
John B
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Thanks for that John very informative indeed. Doesn't sound like the best thing to try and install/remove the trusses near the mirrors!
btw your SDM#33 is beautiful
My next scope may be something similar to that
