As usual, OPT provides superb service and the products are precisely what they advertise.

I purchased the thermistor to assist with focus control during long imaging sessions. When used in conjunction with the ASI Air Pro it will re-focus after a 3 degree (C) change and assists with expansion or contraction of the OTA. I have used it this winter and found it helpful since the temperature does change significantly during the nights here in the northwest US.

Great quality - silicone coated wire Easy setup - just plug it in and it does the rest OPT has some of the best service in the business!

So far great experience. I've had about a dozen sessions and it works great. Only problem I've had is the EAF doesn't provide a mounting solution for the Sky Watcher Esprit100ED. I had to fabricate a bracket, but no big deal and the focuser has been performing as expected. Unfortunately auto-focusing is not supported in the ASIAIR Pro, so it pretty much is still a remote but manual focuser.

Amazing experience as usual!! Fast and efficient shipment!!