🇬🇧 CAA and Pro Rotators
Things to consider regarding rotators
This instrument, also called a "field rotator," is attached between the focuser and the camera. It allows you to rotate the image.
Please note the following:
Compatible connection
There are various thread types for screwing it on. Metric fine threads can have different pitches. The external threads usually point towards the camera, the internal threads towards the telescope lens – but there can be exceptions!
It's best to check the technical specifications and dimensional drawings. If you are unsure, please ask.
Sufficient optical length
How much travel is left at the focuser when you have focused your camera without the rotator? The rotator must be optically shorter than the remaining focusing distance.
Example: Without a rotator, your focuser is extended by 17 mm when the camera is focused at infinity. In this case, you can use a rotator with a 14 mm optical length. However, a rotator with a 20 mm optical length will not work.
Remember to take into account the length of any adapter rings that may be required.
Clamping Screws
One or more locking screws are used on manual rotators to fix the set position.
Do not overtighten the screws, otherwise they may be difficult to loosen again due to temperature fluctuations.
Secure Connection
When turning the accessory connected to the rotator, it is best to do so clockwise. Turning it counterclockwise could inadvertently loosen the connection between the rotator and the accessory. This is more likely at lower temperatures because the lubricant in the rotator may be more viscous.
In astrophotography, you always need new flat frames when you have rotated the rotator to a new orientation.
Connections and special features of Omegon rotators
The three CAA rotators have slightly different characteristics compared to the two Pro rotators. See the table below for details:
| Model | Internal thread (usually for telescope) | External thread (usually for camera/filter wheel) | Optical length |
| CAA T2 (#87375) | M42*0.75 | M42*0.75 | 13.5mm |
| CAA M48 (#87376) | M48*0.75 | M48*0.75 | 14mm |
| CAA M54 (#87377) | M54*0.75 | M54*0.75 | 14mm |
| Pro M56 (#86756) | M56*0.75 | M56*0.75 + 2" Plug diameter | |
| Pro M82 (#86757) | M82*1.0 | M56*0.75 + 2" Plug diameter |
The Pro Rotators fit perfectly on the 2" focusers #85063, #85065 (M56) and the 3" focusers #85064 and #85066 (M82).
Only adjust the small Allen screws if the rotator is noticeably too easy or too difficult to turn. They should be adjusted very precisely.
The CAA Rotators are designed for light to medium-weight accessories and can be mounted wherever the connection and optical length allow.
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