Hi, I have watching this tread with a bit of interest and sorry to jump in on this with another question as it is pretty well related.
I am looking for a dew heater to fit an eyepiece ( 10mm Tele vue Delos )
I seen the link posted for the ones on Amazon, and noticed that a USB power bank was mentioned to power them.
Just out of interest, what size USB power bank would you recommend looking at?
I will have to measure the eyepiece to find what size to get for that.
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