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Thread: T Adapter Threads

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    Default T Adapter Threads



    T-threads are 42mm in diameter. Unfortunately, there are two standard pitches; .75 mm, which is the standard used by telescope makers. (at least Celestron and Orion, which are the only ones I have measured. This thread spec is referred to as T2.

    Some camera manufacturers use a 42mm thread with a pitch of 1mm. This is known as the M42 standard or the Pentax mount. It is often erroniously referred to as a t-thread.

    The pictures below show two adapters for Canon DSLR cameras. They were both sold as T-adapters. The thin one is M42 thread, and the thicker Canon branded one has the proper telescope-adaptable threads.

    Make sure when you are purchasing adapters that you are ordering the proper thread pitch.
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    Default

    Edmund Optics, ScopeStuff and Agena AstroProducts are great sources for T-Thread [M42 P0.75] F to F, M to M, Extensions and Step Up and Step Down Adapters.

    Inspect the threads before using one of these threaded Parts. Some can be supplied with very rough threads, due to a dull cutter or to pushing the threading operation to fast. Once a rough trhead Part is snugged, it can be very difficult to remove.

    ScopeStuff sells a Filter Wrench set to help remove tight Parts. I reccomend that you never use tools to tighten Adapters, Converters and Extensions. Only use Tools to remove these Parts.

    For stuck pieces, try putting a wrap of duct tape on the piece before using a ScopeStuff Filter Wrench, or multigrip Wrench. The duct tape will help resist slipping on the Part and will limit damage to the OD. AlanP

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    Default

    Hi there, do you know anybody who makes eyepiece adapters, iam looking for one with an m37x0.75 male thread so it will screw into my scope body & the other end has to have an internal bore of 1.25" so it will take standard telescope eyepieces, many thanks.

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    Default Re: T Adapter Threads

    Inspect the threads before using one of these threaded Parts. Some can be supplied with very rough threads, due to a dull cutter or to pushing the threading operation to fast. Once a rough trhead Part is snugged, it can be very difficult to remove. ScopeStuff sells a Filter Wrench set to help remove tight Parts. I reccomend that you never use tools to tighten Adapters, Converters and Extensions. Only use Tools to remove these Parts.

 

 

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