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Home Accessories Adapters & Extension Tubes Altair 50mm 2 Inch Extension Tube Positive Lock
The positive locking collar can be unscrewed from the lower 2" barrel to reveal an M48 male thread, so it can be used for other adaptation purposes such as connecting filter wheels and M48 DSLR adapters to 2" focusers. The positive locking collar prevents marring of your eyepieces or accessories by clamping them evenly, far superior than simple screw or compression rings.2" 50mm extension tube with a Positive Lock clamp, ideal for spacing DSLR cameras on refractors without a diagonal in place.Adds 50mm distance between telescope focuser and eyepiece or camera. Fits 2" focusers.Simply twist the ring to unlock the accessory.The extension tube is threaded to accept standard 2" filters. (M48)A thumbscrew is included for those who want to lock the collar in the closed position. This does not protrude through to the 2" item being clamped in place.
Much better quality than the price would suggest. Very pleased. (20/02/2024) - Hull
Nice piece of kit Nice, solid piece of kit. Works wonderfully and as expected, and great fast delivery also. Thank you. (26/03/2023) - Herne Bay
Very good bit of kit Very happy with this. Solid and secure. They even combined postage to be save me money. Very good comms when I had questions about it (26/03/2023) - East Yorkshire
First class I ordered my locking focuser but sadly it was broken upon delivery. I new one was posted and arrived just a few days later. Cannot fault service and after sales. well done (09/10/2022) -
Excellent build quality and super fast delivery A+ This is well built using quality materials and delivery for super fast. Thanks A++++ (31/01/2022) Stephen Williams - Stephen Williams
Ideal and great quality Love this item. No more scratches on my eyepieces or extensions. I have only just begun viewing using 2" eyepieces and realy looking forward to using more of the same type of fixings from now on for both observation and Astrophotography. First class customers service and delivery. Thankyou. (24/01/2022) Dave Smith - Kent
Superb quality at a very reasonable price I bought this to allow the use of a 1.25" prism diagonal with my refractor and its Feather Touch focuser. The black anodised finish and precise tolerances match the focuser perfectly, while build quality is excellent with no play or wobble even when using a binoviewer.. (23/11/2021) Andrew - Liverpool
ALTAIR 50MM 2 INCH EXTENSION TUBE POSITIVE LOCK What an excellent well made extension tube, and in 2020 an unbeatable price. Well done HT. John (12/09/2020) -
Great product, great service. Needed a 2 inch clicklock type adaptor to prevent marking my gear. The Altair 50mm extension tube positive lock solves the problem. Holds well and very securely with the thumbscrew lock. Great value, well made and superfast delivery from Harrisons. You need to make sure you've got enough focus. (15/08/2020) -
Solidly made, does the job. Nicely engineered, as per the description it can be separated into two parts which provides some extra flexibility. Twist locking mech as described does not mark whatever is inserted into it. Recommended. (02/05/2020) Paul Evans - NW England
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