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Starman1
Vendor - Scope City
   
Reged: 06/24/03
Posts: 10960
Loc: Los Angeles
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Though I own a dob, I am a fan of GoTo SCT's. I think they're fine scopes for multi-purpose usage (visual, film, CCD), even though the secondaries are larger than what you would prefer for the best contrast and resolution. I have followed the "hot air" posts from everyone (since no one owns one and I haven't seen any user reports, the posts we've read are, indeed, "hot air"), I feel obligated to throw my comments into the soup.  Most of the features of this scope are of way more importance to an astrophotographer than a visual observer. If Meade has created an RC primary with the combination of a corrector plate and sperical primary, then great for them. But the RC design is NOT a visually-optimized design. It sacrifices tightness of the on-axis star images to produce better images elsewhere in the field. Photography is less stringent than visual use where it comes to spot size in the center of the field of view. I therefore have come to the conclusion that this is an IMAGER's scope, and not really intended for the visual observer. That seems to be the way of technology in telescopes, anyway--video cams, CCDs, and computer processing of images--and it really is pushing the amateur into what used to be considered professional territory. Meade's RCX series will be excellent for that purpose, and if that is your primary interest, then go for it, because they're bargains for that kind of scope. But if you are a visual observer, and your interest is in the kinds of features that enhance visual observing, then these scopes are not for you, in my opinion. Will they be usable visually? Sure. But they will be outperformed by simple dobs with high quality optics, aperture-for-aperture. So OK, the dob requires a Paracorr to achieve the flat field. That still leaves me enough money to buy a bag of expensive eyepieces. The point is, as a visual observer, I find the features on this scope to be interesting and progressive. But the optical design is so obviously oriented to photographers that I simply do not understand why any visually-oriented observer would contemplate one. An SCT would be a better choice, for a lot less money. And a good Dob would be an even better choice for a LOT less money. I keep seeing questions about how they are visually. I think that's the wrong question entirely. The right question is: How good are the photographic images? If they're good, Meade will have managed to significantly slash the cost of owning a high-end astrograph.
-------------------- Don Pensack
12.5" Truss Dob, 5" Maksutov
Sustaining Lifetime IDA member, TeleVue junkie
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Anonymous
Unregistered
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Well, it looks exiting the new information. Maybe in 8 months to a year I will aquire one for the new astroshed that is being built. But for now my 12" lx200gps is good instrument to be sittin on the pier. -Steve
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c131frdave
Post Laureate
   
Reged: 01/17/05
Posts: 4373
Loc: Arcanum, Ohio
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I think Don is right. These Meade DSIs came out in time for folks to figure out how to use them before buying an RCX. DSLR photography is very popular and taylor made for this version of a corrected RC scope. Looks like they wanted to make a mid level big aperature imaging scope for the middle class ametuer.
I read that the 10" RCX is like a high end 8" APO refractor. If that is so, you won't see too many images from me because I'll be busy turning cartwheels.
-------------------- Tak NJP
SXV-H9
Various sizes and shapes of formed glass
Edited by c131frdave (05/16/05 12:14 AM)
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Anonymous
Unregistered
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Very good points Don! This is really an astrograph, not a telescope for strictly visual observers; a Dob of the same size or a SCT will probably suit a strictly visual observer just as well or better.
Another point that you touched on is the fact that this scope seems to have much more in common with an optimized SCT than an RC. I don't want to bash Meade too much, but I find their marketing of this scope to be quite misleading. This scope seems to have a spherical primary mirror:
from Meade's RCX400 page...
"The RCX400 optical design consists of a hyperbolic secondary and corrector lens/primary mirror combination that performs as one hyperbolic element."
This is inherently therefore not an RC design, which specifically is based upon difficult to manufacture hyperbolic surfaces on both the primary and secondary mirrors. This is a big reason for RC scopes from other companies costing a great deal more than the RCX400 scopes. In my opinion, Meade really has no business calling these scopes Ritchey-Chretiens. They may turn out to produce very nice flat and aberration-free images across a large focal plane, and be excellent value for the money, however these aren't really Ritchey-Chretiens and prospective buyers shouldn't be duped into thinking they are getting something comparable (at least in design) to those offered by the high-end RC manufacturers.
Hopefully, these scopes will perform very, very well and provide an integrated, imaging platform suitable for many users at semi-reasonable price (fingers crossed) . For the last few months I've been dying for more info and test images from these scopes, so can't wait to see more. So, come on you early adopters, get busy and show us what these scopes can do!!! 
Tim
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