Geared tripod head.

[Adreneline]

I just bought one of these for use in normal everyday photography but it clearly has great potential in AP.

https://smile.amazon.co.uk/Manfrotto-410-Junior-Geared-Head/dp/B000JLI4Q2/ref=sr_1_1?ie=UTF8&qid=1549720585&sr=8-1&keywords=manfrotto+410+junior+geared+head

Compared with a standard Manfrotto ball mount which comes with built in 'sag and droop' everytime you try to position the camera this little gem works a treat, and it is not that much more expensive than many of the ball mount models. I've already used it with a 300mm lens on a 70D to image the crescent moon and it is a joy to use.

So far highly recommended.

 

[Alien 13]

They are good and like you say dont suffer that final sag when you let go on ball heads or pan and tilt heads too.

I use one with my MAK and DSLR for luna shooting and there is very little space around the Luna disc so any sag would be disastrous.

Alan

[Ludd]

They’re a great bit of kit, but I have hardly used mine as I am usually either using lightweight gear to keep mobile, or using a heavy GDPX mount (which rarely sags). So mine is up for sale....