During an astrophotography session in outdoors, smowhere in the field, especially in spring or autumn, there is dew.
A wet lens makes photography impossible, so you need to take care of the possibility of drying the lens and even better, prevent dew during the photo session.
A heater-tape powered from the USB port of the powerbank, is ideal for reducing dew on the lens and even eliminating it totally.
Perun powerbank crosing borders and reached new owners in Singapore
The laser collimator is a very useful tool especially for amateur astronomers. My model ( Baader Laser Collimator Mark III ) works very well, but has one disadvantage, like any other type of this type. The weakest link in the whole construction is the SR battery model. Usually, the battery likes to fail when the collimator tool is most needed. The battery model is not very popular and, unfortunately, it is not the cheapest. So I’ve made an external power supply for Laser Collimator MK III.
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