Quote:
Originally Posted by pjphilli
As far and narrow and wide views are concerned would it be possible to make a cone mask to reduce the "field of view" of the wide SQM to look at various sections of the sky when required?
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I suspect you'll find the meter will detect the mask as an obstruction and return seriously incorrect readings.
See the darkest readings on Unihedron's records database:
Unihedron database of readings.
At least the top seven are not true and accurate readings, mostly as a result of obstructions such as cloud or trees. (That's per Anthony Tekatch of Unihedron.)
The highest readings attainable at the darkest of sites are no more than up around the very low 22s (eg, 22.00 to 22.10, and even the latter is suspect) according to Anthony and other experts.
If you fit a mask to your SQM and get very high readings it'll be the result of the meter seeing it as an obstruction.