An extension tube adaptor can be useful for astrophotography. This one has a male and female thread on it and is 42 x 0.75mm in size. It includes three different lengths- 5mm, 10mm and 30mm and you can use different combinations of the different sized extender pieces to get the required length. It is made from metal which means that it is durable and should last a long time. It will help you to get the right image scale or spacing required for reducers or field flatters. You can change the focus very quickly which is very handy in outdoor situations.
Svbony SV129 M42 Extension Tube Adapter
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