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Home Astro-Imaging T Thread & M48 Extensions Explore Scientific M48 Extension Tube Set
The Explore Scientific M48x0.75 extension tube set comprises of 5 tubes, 30, 20, 15, 10 and 5 mm length, all are anodised matt black for controlling stray light.For adjusting different distances of the camera to the focal plane of the telescope or a corrector/field flattener. There is an M48.0.75 internal and external thread in each individual tube. The M48x0.75 thread is also called a 2.0 inch filter thread. Camera specific bayonet adapters or colour and nebula filters can be used with these tubes. Included are 5 different tubes with the steps 30, 20, 15, 10 and 5 mm. The larger free inner diameter of 45.0 mm effectively prevents undesirable vignetting of the camera sensor. The outer diameter of the sleeves is exactly 50.65 mm and can therefore be mounted directly in any 2 inch diameter eyepiece adapter - useful for adding backspace to eyepieces if needed.FEATURESExtension sleeves M48x0,75 in setFive extension sleeves: 30, 20, 15, 10, 5 mm (giving a total of 80mm backspace)Use with correctors and field flattenersDistance adjustment from camera to focal planeSuitable for camera-specific bayonet adaptersAlso suitable for 2.0 inch colour and nebular filtersInternal and external thread M48x0.75 mm (large T2 thread)Large inner diameter of 45.0 mmOuter diameter is 50.65 mm (2 inches)Black matt anodized aluminiumTotal weight 85 gramsWHAT'S INCLUDEDExtension sleeves M48x0.75 (5 pieces)
Useful tube set Great service as usual from HT. These tubes are well made especially for the modest price. Useful for getting the correct back focus when you have multiple scopes and cameras. (29/01/2024) DaveP - Chester
Useful, high quality product. Needed a selection of spacers to put my Altair Astro Hypercam near the optimum prime focus and when using a focal reducer. This Explore Scientific tube set is high quality and allows a good range of options. I have no worries about the camera falling off. Great service from Harrison Telescopes. Thx! (23/01/2023) Dave - Fife
EXPLORE SCIENTIFIC M48 EXTENSION TUBE SET Well made tube set for setting back focus. good service from Harrison telescopes as always (24/10/2022) anthony whisker - london
Seem to be good quality and easy to screw into Ati Delivered within 2 days-good service! (07/03/2022) -
Good quality extension tube set This is a well made product for getting that vital backfocus distance The 'blacking' is not too shiny to cause reflection in the optical t Threads are well formed, nice tight fit but critically no binding when attaching Packaged well and very quick delivery once again from Harrison Telescopes (01/02/2022) SteveN - Somerset
Excellent Item arrived very quickly and packaged well. Item itself was a really good addition to my kit, some nice variations in size which helped me to achieve backfocus distancing on multiple cameras. Good quality construction and clean threads. (28/11/2020) Jack - Manchester
Make sure this is what you want A pricey, but well manufactured set of spacers - useful to ensure the correct spacing between an astro camera and the business end of an OTA. An adapter may be needed in addition. (07/11/2020) A Ramsay - Kent, UK
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