The fan on my bintel 800mm f4 reflector vibrates my scope very slightly. OK for visual viewing but no good for photography, Is this usual or do I need to get a accurately balanced fan and vibration proof mounts for it.
Switch it off Simon, better yet, remove it. They are not very effective,
especially if behind the mirror, and in your case, I believe you keep it in your observatory, so the scope is at ambient anyway. There is a thread going at the moment which shows how ineffective they are in their usual configurations. I'm in my 63rd year of owning/using scopes, and have never felt the need for one on any of them.
raymo
Actually I disagree about removing it. My newt (in my observatory) is also at ambient however early in the morning it will be fogged up. To prevent this I can turn fan on and it will clear the mirror very quickly (like a demister on your car windscreen). So it does have some use.
I do run mine during imaging but it is isolated from the scope (and there are various ways of doing that).
crikey yes, wouldn't consider imaging without a fan running - help keep the mirror near ambient as the temperature changes. Isolate vibrations with elastic hair bands - I think my granddaughter calls them scrunchies (or wot-evvuh).
