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Hi,
Lets forget the marketing blurb and look at the practical realities of the situation when comparing a premium truss dob to a generic dob. I have an Obsession and a generic dob and have used lots of other scopes from both generic and premium categories.
The Obsession has either an OMI mirror or Galaxy mirror with enhanced coatings which offers two advantages over a generic dob. A premium grade optic and enhanced coatings. You will read negative publicity about enhanced coatings and increased scatter. I think most of this stems from when enhanced coatings were in their infancy and the processes being developed and improved. I can't fault my enhanced coatings and will order them each and every time if offered by the mirror supplier. What do they gain you? Its hard to say and quantify. I can say my 18" with enhanced coatings equals or betters Andrew Murrells 20" which has older standard coatings for target brightness. The premium optic gives improved contrast over a generic optic which gives a perceived aperture increase. Again the magnitude of this is difficult to quantify.
Thirdly having an Obsession with smoother movements than a generic dob or better still motorised tracking via servocat, again gives a very real perception of increased aperture.
All of these things add up to a very real gain in the observers eyes of increased aperture and more importantly slightly improved image quality. That proportionate perceived increase in aperture generally costs proportionately a lot more than the performance increase over the generic scope however.
In simple summation. You definately see more in the Obsession, or any premium scope, than you do in the generic scope because of a combination of the 3 factors I have mentioned. How much, enough to be noticeable. Is it worth the extra cost? Only you can answer that.
Cheers.
John B
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