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Primary Mirror Heater.

I originally wasn’t planning on heating the primary mirror as I read it’s less vulnerable to dew and a fan is sufficient to keep it at bay, but as I got a pack of these 5ohm ceramic resistors for the secondary mirror (they were larger than I thought) I used them on the primary. They are stuck onto the mirror with some thermal silicone just on the sides so they can be removed easy.   

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Photo Information for Primary Mirror Heater.

Taken with samsung SM-G998B

  • 6.7 mm
  • 1/27
  • f f/1.8
  • ISO 500
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