|
Hi Darrell
I have an Esprit 120 and it has the same focuser setup. If the lever in the second pic is where it is when you have the imaging train attached it will slip as you describe. You need to use the lever to lock the focuser in place and this will prevent the slippage with you are experiencing. I have had about 1.5 kgs hanging off the back off mine and with the lever tensioned I can image with the scope vertical and no slippage.
The lever operates on a cam from what I can ascertain and it just needs to be pulled back until firm. There is no focus shift when this is locked from my experience, even if focusing before I lock it. Just ensure that you tighten the lever itself into its socket - it has a habit of working loose if you transport the scope. Mine fell out and I didn't realise until I went to tighten it. Fortunately it fell out in the case and not at the dark sky site I had set up at the night before.
Brian
|