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I have to agree with Josh on this point, fan quality is far from any standards, a high quality fan is worth it's weight in gold.
My fan experience is only playing with modified cameras (A lot of experience playing with computers and electronics cooling systems) where I've stripped the guts out and put them in a jiffy box/case, not professional astro cameras obviously. I have however found out along with high quality fans, good quality soft fan mount rubbers have had a huge impact on my designs where they can be fitted, not possible on everything I do know that.
Many people will tell you you need a fan with Japanese bearings, the common brands suggested on various forums do always seem to work well.
This is great if you can actually get in to replace the fan, not always possible without manufacturers intervention.
The resistor which is effectively reducing the voltage to the fan and reducing the fan speed which reduces the vibration, it doesn't affect the operation of the camera?
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