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SHIPPING NOT AVAILABLE - In Store Only
This is an older TV 102 (not the current TV 101), but it's still an apochromat. It is an f/8.6 model in good condition. The optics are clean; however, there are what look to be some very minor scratches in the objective that we have tried but failed to remove by cleaning - see the photo. There is a line running from 6 o'clock to 12. This should not affect your views, but we realize that someone who buys a TeleVue product is expecting near-perfection.
The body also has some minor scratches on it, consistent with use and age. These condition issues have been taken into consideration in the pricing.
This includes:
- William Optics Innovative 210 dovetail bar for mounting the scope
- The original TeleVue dovetail bar as well
- TeleVue Everbrite 2" diagonal (no box)
- Telrad base (no Telrad; sold separately)
We do not have the shipping boxes for this, so this is available for in-store pickup only.
This 4” aperture telescope has an 880mm focal length f/8.6 APO doublet diffraction-limited objective.
Standard features of the optical tube assembly (O.T.A.) include: sliding dew shield, screw-on cover, 2” focuser, and custom hard-shell case.
Diagonal
This comes with a TV Everbrite Dielectric diagonal. It is in excellent condition, with minimal wear, and clean optics with just a little bit of normal dust present. As you would expect with any TeleVue product, it is completely solid and well-made. It includes the 2" to 1.25" adapter, but only has one dust cap for the adapter. It does not have its original box.
The Tele Vue Everbrite 90-Degree 2" Diagonal is the way to go if you want one of the best telescope accessories money can buy! Here's why:
- The Tele Vue Everbrite has a Pyrex mirror with 1/10th wave accuracy
- Dielectric, non-metallic coatings have 99% reflectivity across the visible spectrum
- Resulting images through this diagonal are brighter and "whiter"
- The Everbrite's body is machined from one solid block of aluminum for permanent alignment
- 2" filter anti-reflection threads in the diagonal let you attach filters to the diagonal instead of moving from eyepiece to eyepiece
- Brass clamp ring holds 2" eyepieces and accessories firmly in place without marring the barrels
Mounting
This unit includes both TeleVue's original proprietary dovetal, as well as a standard William Optics Innovative Dovetail 210mm Vixen Mounting rail, already attached. The included Tele Vue Ring Mount permits mounting to the Tele Vue Gibraltar, heavy duty camera tripods or equatorial mounts using Tele Vue adapters (consult your Tele Vue dealer).
Optical tube assembly
The OTA consists of the objective cell, tube and focuser. The front cell houses the carefully aligned objective. Never attempt to loosen the 3 alignment screws in the front lens cell. The tube is aluminum and powder coated, requiring no special care. The rack and pinion focuser is driven by high leverage knobs. Tele Vue-102 ® The two tension screws on the top of the focuser body can be adjusted to add resistance when using heavy eyepieces. These tension screws tighten against a brass clamp ring, which then cinches down on the teflon sleeve in which the draw tube slides.
For photography it is not necessary to tighten beyond the need to keep a camera stationary. Even when sufficiently tight, the focuser knobs can still drive the draw tube. The two lock screws in the end of the draw tube also tighten against a brass clamp ring for extra holding power on the diagonal or other accessories.
Ring Mount and Balancing
The Ring Mount permits easy telescope balancing. If you are using a Tele Vue Gibraltar, first unlock the brass vertical motion tension knobs then unlock the “bat handle”, on the Ring Mount, reposition the telescope by sliding it fore or aft and re-lock. This permits balancing heavy and light eyepieces, cameras, etc. It may also be helpful to use our Bronze “Equalizer” (BEC-0005) in place of the standard Hi-Hat 2”-1¼” Adapter when using light-weight eyepieces. The extra weight can balance heavier 2” eyepieces so you may not need to shift the tube in the Ring Mount at all, when changing eyepieces.
Type 2-element APO refractor, Fully Multi-Coated
Clear Aperture 4 inches (102mm) Aperture Gain 212, compared to a 7mm exit pupil
Focal Length 880mm
Focal Ratio f/8.6
Resolution (visual) 1.1 arc-sec. (Dawes Limit for a 4 inch aperture)
Resolution 163 line pairs per mm (photographic)
Magnification 16x to over 200x using Tele Vue eyepieces
Field, Visual 3o at 16x
Focuser 2-inch, rack and pinion type
Mounting Adjustable ring mount with ¼-20 tapped holes for standard photographic tripods or optional Tele Vue mountings
Weight 9 lbs. (tube assembly) 19 lbs. in case, 28 lbs. shipping
Length 30.5-inches (O.T.A. only)
Accessories custom fitted soft case, screw-on lens cover, sliding dew (glare) shield.
Tube Powder-coated aluminum