With the help of this lens adapter you can attach a Canon EOS lens to ZWO ASI (or other) cameras with flange focal distance of 12.5 or 17.5mm when used without a filter wheel.
This new EOS-T2 adapter consists of three parts. The EOS-T2 adapter itself consists of two parts, but usually used as a single unit, and then there is an additional T2-extender of 5mm length.
Currently, using the adapter with or without the 5mm extension makes it suitable for all ASI cameras.
This new type is NOT adjustable. This EOS-T2 adapter supports Canon EF lenses only.
Optical length: 30.5mm (inc 5mm removable extension) (this is how you would use it with a ZWO camera that has 12.5mm focal flange distance, to achieve a total of 43mm back focal distance)
Optical length without extension: 25.5mm (this is how you would use it with a ZWO camera that has 17.5mm focal flange distance, to achieve a total of 43mm back focal distance)
(we guess that with this you can achieve 43mm instead of the usual 44mm of a Canon camera, because if you insert a thick filter, that would also add a bit to the back focus, so this way you will still not run out of distance to be able to focus at infinity)
ZWO NEW Nikon-T2 Mark II Lens Adapter for Most ZWO ASI Cameras
This is the new, improved version of the Nikon-T2 adapter. The release action knob has been improved to make it easier to remove the adapter from the lens.
With the help of this lens adapter you can attach a Nikon lens to most ZWO ASI cameras. It is compatible with cameras with 12.5mm or 17.5mm back focal distances.
This ZWO Nikon-T2 Lens Adapter comprises two parts, a Nikon-T2 adapter and a T2 extender. (This new type is not adjustable.)
Currently compatible with most ZWO ASI Cameras when used without filter wheel.
Features a filter holder for standard 2" filters (with M48 thread).
Suitable for all ZWO cameras with flange focal distances 12.5 and 17.5mm.
Maximum length: 33.4mm
Minimum length: 28.4mm
This adapter consists of three parts:
Nikon bayonette with M57 male thread (appr. 10.6mm optical length)
Adapter with M57 female and M42 female threads (17.8mm optical length)
Screw-in extender with M42 male thread M42 female thread (5mm optical length)
Images are for demonstration purposes only. Filter is not included.
NOTICE: G-type Nikkor lenses need to find some way to open the aperture up. (for example, using an orthodontic rubber band to hold the little aperture tab on the lens in the “open” position.)