TS-Optics 3mm Extension with M48 - 2" Filter Thread and 2" Diameter
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Products marked Available on order require 5–15 business days for processing. Our team will keep you updated promptly if anything changes.
What are the warranty terms?
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Many brands also offer extended warranty coverage beyond 24 months — contact us to find out the specific terms for the product you're interested in.
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Can I return a product?
Yes: you have 14 days from delivery to return any product and receive a full refund — see our Refund Policy for full details.
Items must be returned in their original condition and packaging. Return shipping costs are the customer's responsibility.
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Vai al moduloM48 Extension Ring 3mm for Precise Backfocus Adjustment
The TS-Optics M48 3mm extension ring is a threaded spacer designed to precisely adjust the backfocus distance between astronomical accessories. It is ideal for positioning components at the correct spacing, such as a camera in relation to a reducer or other accessories using a standard M48 thread.
M48 Male/Female Thread Connection
The extension ring features a dual M48 thread, with female threading on one side and male threading on the other. This allows seamless integration into an optical train using M48 connections. By combining multiple M48 extension rings, it is possible to achieve a precise and predetermined spacing, which is particularly useful in astrophotography setups.
Technical Specifications
| Telescope side thread | M48 female (internal) |
| Camera side thread | M48 male (external) |
| Length | 3 mm |
| Finish | Black anodized |