Front ERF vs Internal ERF? Minimum size?

Frankenscope? Let's see it!***be advised that NOTHING in this forum has been safety tested and you are reading and using these posts at your own peril. blah, blah, blah... dont mess around with your eyesight when it comes to solar astronomy. Use appropriate filtration at all times...
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marktownley
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Re: Front ERF vs Internal ERF? Minimum size?

Post by marktownley » Tue Jun 05, 2018 9:49 pm

Maybe the smoke / vapour we are seeing is just pollen in the air showing tube currents?
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Re: Front ERF vs Internal ERF? Minimum size?

Post by TheSkyBurner » Thu Jun 07, 2018 4:05 am

today i moved the b-ccd filter 40mm closer to the focus, the reflection is now elliptical shaped and being dumped across two of my extension tubes (threaded and baffled). There is no smoke coming off of this now and the heat is effectively dissipated across the entire array of extensions. It is now functional as a cylindrical heat sink.

The reflection is now completely away from optical line of sight and is not causing any additional interference or reflections on the objective. The polarizer is detached, but I may still install a smaller one to experiment with filter clocking.

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