What solar filter 4 refector with small hole n cap
Posted 13 February 2013 - 02:38 AM
Although, viewing through the small hole would turn the 90mm f/11 into f/ really slow!
Posted 13 February 2013 - 12:53 PM
Posted 13 February 2013 - 01:00 PM
An A4 sheet will give you 6 filters if cut neatly and fitted into a cardboard holder .
Alternatively you could buy a ready made filter for the
scope but these are more expensive.
There are plenty of options/designs for holders online , personally I make mine from 'embroidery rings' .
Posted 13 February 2013 - 05:55 PM
Has anyone out there used the smaller hole viewing technique, and if so, how does it compare to full aperature?
Posted 13 February 2013 - 10:40 PM
Posted 13 February 2013 - 11:02 PM
To be totally honest, the only good solar use for them these days is for stopping down very large refractors (6" or above) to minimize heat build-up when using a herschel wedge.
Posted 15 February 2013 - 12:49 PM
Posted 15 February 2013 - 08:53 PM
Littlegreenman, yep, an apature stop. Go with the Baader film at full apature. More apature will provide more detail on the active areas. Less apature less detail.