Vixen VMC200L Catadioptric Telescope
The Vixen VMC200L is a unique catadioptric optical system. It incorporates a primary mirror and a meniscus corrector just before a secondary mirror. By doing so, light is corrected twice on the optical path. The end result is that spherical aberration and field curvature are corrected to a high degree of optical performance. The Vixen VMC200L’s primary mirror is f/2.5; the compound optical system is f/9.75. This makes the system much more compact and portable than its competition. With the optical correction placed before the secondary mirror, the VMC200L avoids the necessity of having a corrector plate and all the dewing problems associated with a closed optical tube.
An additional key feature is the rack and pinion focusing that is placed behind the Vixen VMC200L’s primary mirror. The use of this focusing system eliminates the image shift associated with most other SCT systems. This is especially important when using high power magnification or astro-photography. When focusing, the image is stable and easy to adjust.
"Optically, there’s nothing to complain about. I saw no edge-of-field problems at all and images were crisp and well defined through the eyepiece. The f/9.75 focal ratio is noticeably faster than the typical Maksutov design and, of course, that translates into a wider true field of view with any given eyepiece. Reaching focus is easy, as there is a nice, sharp “sweet spot,” and there is never any doubt when you’ve hit it. I felt this was important, given that the rack and pinion focuser is not currently available with a dual speed option.
A Few Words On the Vixen VMC200L Catadioptric Telescope
Another thing I noticed was that the Vixen attracts attention. At the Star-B-Q event, attendees stopped by frequently and asked questions about it. They were very interested in the scope and very impressed after viewing through it. The large, red Vixen logo prominently displayed on the OTA gives the scope an air of superiority, and the build quality and performance lives up to its looks. The glossy white finish is durable and nice to look at, and the scope is solid throughout. The flip mirror is, in my opinion, something that could be improved on, but as it is a removable accessory, it’s not really an issue. Overall, this is just a really nice, well performing telescope, and a very unique one at that. Lightweight, portable, 8 inches of aperture, fast cool down, zero image shift, and reasonably priced – I guess it may be possible to have your cake and eat it too after all!" -- Erik Wilcox "Astronomy Technology Today"
Vixen VMC200L Catadioptric Telescope Features
- Outstanding Theoretical Resolution (Dawes) of 0.63" (16mm) and Theoretical Minimum Magnification of 13.3.
- Premium design for high magnification astrophotography applications.
- Primary mirror is f/2.5 with a compound optical system resulting in a focal ratio of f/9.75.
- More compact and portable the competing models.
- Faster focal ratio for a wide, true field of view.
- Additional Information
SKU VX-58291 Manufacturer Vixen Telescope Series Vixen VMC Optical Design Modified Cassegrain Mount Type None - Optical Tube Only Warranty 5 Year Warranty Telescope Aperture 8" Telescope Focal Length 1950mm Telescope Focal Ratio f/9.75 Limiting Stellar Magnitude 13.3 Optical Coatings Fully Multi-Coated Dew Shield Included? No, Sold Separately Optical Tube Outer Diameter 232mm Length of Optical Tube 21.1" Optical Tube Weight 13 lbs. Tube Color or Finish Gloss White Eyepiece(s) Included None Finder Included None Alignment Procedure N/A Objects in Database N/A Power Adapter Included None - Does Not Require Power Counterweights Included N/A Mount Weight N/A Tripod Type Included None, Sold Separately Total Telescope Weight N/A
- Included Items
- Vixen VMC200L Modified Cassegrain OTA
- SXD-Style Mounting Rail
- Questions & Answers
Product QuestionsHow are the telescope focal length (1950 mm) and focal ratio (9.75) defined? Focal length is the distance from the focus to what? Focal ratio is the ratio of what to what?Question by: Bradley Bobbs on Jun 29, 2015 6:27:00 PMFocal length is the *effective* distance from the light rays hitting the primary optic (mirror/lens) to the plane of focus. On most refractors and Newtonian reflectors, this can be measured easily by holding a tape measure against the scope and measuring the length of the light path. On Cassegrain scopes like this Vixen VMC200, the secondary mirror magnifies the image quite a bit, so the manufacturer has to calculate the focal length. 1,950mm is equivalent to 76.7 inches or almost 6 1/2 feet, which would be the length of a Newtonian of the same focal length, but the VMC200 is a folded design and is thus much shorter.
Focal ratio is the ratio of the focal length to the diameter of the mirror. 1950mm / 200mm = 9.75 and 200mm = 1950mm, so f/9.75 tells you that the focal length is 9.75x larger than the 200mm diameter of the main mirror.Answer by: Chris Hendren (Admin) on Jun 30, 2015 10:02:00 AM
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