Questar 3.5" off-axis glass filter for all 7"Questar OTA

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This Questar 3.5" aperture off-axis white light glass solar filter lets you safely see fine detail on the surface of the Sun with a 7" Questar OTA – sunspots, granulation, etc. It will not show prominences, which require a specialized Hydrogen-alpha narrow band filter to be visible.

The Questar 3.5" aperture off-axis filter will provide you with the resolution of a 3.5" telescope, less than the maximum resolution of the 7" Questar, but it is more usable in areas of high winds and generally unstable seeing conditions. It is also an economical alternative to the full aperture 7" filter #29203 for casual solar observing.  

The Questar filter threads securely into the front cell of all 7" Questar optical tubes. It does not merely slip over the front of the optical tube, as is the case with lesser filters. The filter is made of BK-7 optical glass, polished plane-parallel on both sides to reduce the possibility of internal reflections. It is chrome coated to reduce the heat and visible light of the Sun to levels that are safe for both your scope and your eyes.

Shipping is free on this Questar item if it is purchased with a Questar scope that is being drop-shipped to you from the Questar factory. If this item is being purchased by itself as a special order item, a $14.95 freight charge and a 14-day or longer delivery time will apply. The $14.95 freight and a $20 Questar drop-ship charge will apply if faster delivery is required and it must be drop-shipped to you from Questar.

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0 - Not a color filter
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2 years
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Questar - 3.5" Off-axis glass filter for all 7" OTA

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Questar - 3.5" Off-axis glass filter for all 7" OTA
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Our Product #: 23015
Manufacturer Product #: 23015
Price: $995.00  FREE ground shipping - Click for more info
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This Questar 3.5" aperture off-axis white light glass solar filter lets you safely examine sunspots, granulation, and other fine detail on the surface of the Sun with a 7" Questar OTA.






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