Alstar Telescope Extension Tube 2" Eyepiece Extension Optical Length 35mm
4.2 (35 items)
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Product details
| Management number | 250297700 | Release Date | 2026/09/17 | List Price | US$12.40 | Model Number | 250297700 | ||
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| Category | |||||||||
- Alstar 2-Inch Telescope Eyepiece Extension Tube Adapter provide extra focuser back travel sometimes needed to achieve focus with certain eyepiece or telescope combinations. More back travel is often needed for short-range terrestrial viewing or with use of a field flattener, coma corrector, or focal reducer lens. Extension tube provides extra focuser "back travel" often needed for short-range terrestrial viewing through a telescope, or for astrophotographic applications.
- Features two locking thumbscrews to secure any inserted astronomy accessory; with a brass compression insh to prevent the marring of your telescope accessories
- Machined of high quality aluminum and anodized black; resistant for long time use
- Extension tube provides extra focuser: back travel often needed for short range terrestrial viewing through a telescope; or for astrophotographic applications
- Fits in 2 inch telescope focusers and accepts 2 inch eyepieces or accessories; Threaded for use with standand 2 inch astrophotography filters
| ASIN | B074J5BL47 |
|---|---|
| Brand | A ALSTAR |
| Mount | Equatorial Mount |
| Focus Type | Manual Focus |
| Finderscope | Reflex |
| Item Weight | 3.8 ounces |
| Manufacturer | Alstar |
| Model Number | SKU_AM_ETA235A |
| BuiltIn Media | adapter |
| Field Of View | 11.1 millimeters |
| Item Highlight | Brass Ring, Metal Telescope Accessories, Compatible with 2" Eyepiece, for Astrophotography and Observation, 2" filter thread |
| Number of Items | 1 |
| Compatible Devices | Camera |
| OpticalTube Length | 35 millimeters |
| Additional Features | Extra focuser back travel for versatile viewing and astrophotography |
| Exit Pupil Diameter | 2.29 millimeters |
| Warranty Description | 2 Year |
| Objective Lens Diameter | 35 millimeters |
| Focal Length Description | 35 millimeters |
| Manufacturer Part Number | SKU_AM_ETA235A |
| Item Dimensions D x W x H | 3.2"D x 2.7"W x 2.7"H |
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