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I personally would go with the kendrick heater. If is a esprit 120 you will need to purchase a 6 inch strap . I think of them as Cheap insurance. With the heater on you are actually heating the lens closer to ambient template. Eliminating the dew point factor where your lense can fog up. You only need to run the heater a few degrees either side of ambient temperature. I also use one on my guide scope to enable better tracking, dew free guidescope all night.
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