Tele Vue Ethos 6mm Ultra Wide Angle Eyepiece (1.25" & 2") Projector & Presentation Lamps Gain can be adjusted with

Gain can be adjusted with a through-hole resistor

volume control

watertight and dustproof molded

This board still brings out the DTR pin as opposed to the RTS pin of the FTDI cable

Tele Vue Ethos 6mm Ultra Wide Angle Eyepiece (1.25" & 2") Projector & Presentation Lamps Gain can be adjusted with100 Apparent Field of View 15mm Eye Relief The 6mm Ethos Eyepiece is the higher magnification member of Tele Vue 's remarkable Ethos collection, the first astronomical eyepieces with 100 apparent fields of view. A 100 apparent field of view is a truly astounding number by any astronomical standard. Given that your 'mind's eye' can concentrate upon approximately 50 of a viewing field at once, doubling that amount results in a view that you could feel