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Fine-Tune Your Imaging Train with the Tele Vue 2.4" Spacer Tube
The Tele Vue 2.4" Accessory Tube - 0.080" (2mm) is a specialized spacer designed to give astrophotographers precise control over the back focus of their Tele Vue Imaging System. This component is not a generic extender; it is a precision-machined part engineered to integrate perfectly with the large-format focusers and accessories of NP101is and NP127is telescopes, ensuring optimal field flatness with large camera sensors.
Achieve Perfect Spacing for Flat Fields
Modern field flatteners and reducers require exacting back focus distances to deliver sharp stars from corner to corner. This 2mm accessory tube allows you to make fine, calibrated adjustments to your imaging train, dialing in the exact spacing your specific camera and filter combination requires. Adding this tube provides a small but critical increase in optical path length, helping you achieve the precise distance needed for a perfectly corrected image field.
Rigid, Secure 2.4" Threaded Connection
Unlike generic slip-fit or compression ring adapters, this accessory tube uses Tele Vue's proprietary 2.4-inch threading. This robust connection creates a solid, flex-free extension of the optical train, which is critical when supporting heavy cameras and filter wheels. The threaded design completely eliminates the possibility of tilt, ensuring your camera sensor remains perfectly orthogonal to the light path for consistent, professional results.
While essential for achieving specific back focus measurements, the use of multiple small extenders can be less rigid than a single, longer extender. For larger spacing needs, consider one of Tele Vue's longer 2.4" accessory tubes to minimize the number of threaded connections in your imaging train.
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What is this 2mm Tele Vue tube used for?
It is used to make very small, precise adjustments to the back focus distance in a Tele Vue Imaging System (is) telescope setup. This is often necessary to achieve perfect star sharpness across the entire field with a specific camera, reducer, or flattener.
Will this fit a standard 2-inch focuser or diagonal?
No. This tube uses Tele Vue's proprietary 2.4-inch threading and is only compatible with Tele Vue (is) telescope focusers and their specific line of 2.4" imaging accessories. It will not thread into or fit standard 2" or M48 accessories.
How do I know if I need the 2mm spacer?
You typically need a spacer like this when you have calculated your required back focus and find you are just short. It is for fine-tuning, often after you have assembled your main components and find your corner stars are not perfectly sharp.
Is it better to use this 2mm tube or multiple 1mm tubes?
It is always better to use a single tube to achieve the desired spacing whenever possible. Using one 2mm tube creates a more rigid connection with fewer potential points of tilt or flex than using two separate 1mm tubes.
Is this part of a set of Tele Vue spacers?
Yes, Tele Vue offers a full set of 2.4" accessory tubes (model TLS-2245) with different lengths. This 2mm (0.080") tube, model TLG-0080, is available individually for photographers who have identified a very specific spacing need.
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| Model |
TLG-0080 |
| Extension Provided |
2mm (0.080") |
| Telescope Side Connection |
Tele Vue 2.4" Female Thread |
| Camera Side Connection |
Tele Vue 2.4" Male Thread |
| Material |
Black Anodized Aluminum |
| Weight |
0.8 oz (23 g) |
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Tele Vue 2.4" Accessory Tube - 0.080" (2mm)
× 1
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Tele Vue 5-Year Limited Warranty
