STELLARVUE ET475 - 2" EXTENSION TUBE - 4.75" LONG (Pre-owned)
| Availability: | In stock |
| Delivery time: | Hurry! Buy Now before it is GONE! |
The Stellarvue ET475 is a 2-inch extension tube that extends the distance between the telescope focuser and the eyepiece or camera. Here’s a breakdown of what this extension tube is and how it is used:
Stellarvue ET475 - 2" Extension Tube - 4.75" Long
- Manufacturer: Stellarvue
- Type: Extension tube
- Size: 2-inch diameter
- Length: 4.75 inches (approximately 12 cm)
- Material: Typically made of aluminum or other lightweight, durable material
Purpose:
Extension tubes like the Stellarvue ET475 serve several purposes in astronomical and astrophotographic setups:
-
Focal Length Adjustment: They extend the optical path length between the telescope focuser and the eyepiece or camera. This can be useful for achieving proper focus, especially when using certain types of equipment or for achieving focus with specific cameras or eyepieces.
-
Compatibility: They help in achieving the correct back focus distance required by some telescopes, cameras, or eyepieces for optimal performance.
-
Flexibility: Extension tubes provide flexibility in configuring the optical train, allowing for various combinations of accessories such as reducers, flatteners, or field flatteners.
Usage:
-
Insertion: The extension tube is inserted into the focuser of the telescope, and the eyepiece or camera is then inserted into the other end of the extension tube.
-
Secure Attachment: They typically have set screws or compression rings to securely hold the inserted accessories in place.
-
Alignment: Proper alignment is important to maintain optical alignment and avoid vignetting or other optical issues.
Compatibility:
-
Telescopes: Compatible with telescopes that have a 2-inch focuser.
-
Eyepieces and Cameras: Compatible with 2-inch format eyepieces and cameras that utilize a 2-inch adapter.