Quote:
Originally Posted by markus.a.bergh
So why do you need one apart from being able to control / regulate the temperature , the drain on the battery and draining your wallet ?
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They are pretty good reasons. You COULD get by without regulation, but you would be overcooking any optics you are heating with it, and thats bad if you like crisp sharp images. Ideally you want to apply the minimum heat that prevents dewing.