TS-Optics 2 inch (M48) Extension Tube with Double Sided 2-inch Filter Thread - 30mm Length
This adapter is proven to be valuable in many areas of astronomy. This extension tube has to be screwed into a filter thread of a 2" eyepiece or a 2" adaptation and therefore will extend the barrel by 30mm.
On the telescope side you are able to adapt a Filterthread or even a further Extension Tube. So you are able to extend the barrel user defined without reducing the fitting accuracy instead of using barrels that are wobbling.
- Barrel made of metal
- Black anodized
- Double sided with 2" filter thread (M48x0.75)
- Optical Length is 30mm
- Female M48 thread length: 5mm
An optional additional accessory is the 2" CCD locking ring (parfocalizing ring). The locking ring will be imposed over the barrel and will be fixed in a special position with grub screws. So you will always be able to reach a repetitious focal position.
A special adapter combination: if you combine this extension tube with our TSM48-T2 adapter you get a prime focus adapter from 2" to T2 without a stopping flange and without a safety undercut. According to our experience safety undercuts often do not work well with focusers with a compression ring. The effective optical length of this adaptation is zero, so it is ideal for applications with a critically short back focus distance, e.g. a Newtonian or Dobsonian telescope with a 2" focuser!
|Image shows TSVF230 and TSM48-T2 adapter||When combined, these two adapters form a zero profile 2" nosepiece-T2 adapter|