Hello, can an aperture mask have more than one hole. I am just experimenting with my 6" reflector. I cut a round piece or cardboard and put four holes of about 35mm every 90 degrees around the circle. Will this work as an aperture mask? Thanks.
aperture mask
Started by dale tubbs, 11/04/2003 03:27AM
Posted 11/04/2003 03:27AM
Opening Post
Posted 11/04/2003 03:36AM
#1
You can have as many as you like. I use a 4 hole.
Floyd
Floyd
[SIZE="Large"][/SIZE][COLOR="Blue"][/COLOR] Floyd Blue
Amateur Imager
Posted 11/04/2003 01:38PM
#2
Just out of curiosity, Dale, why do you want to stop down a 6-inch reflector? Are you trying to accomplish something in particular or are you simply experimenting?
Doug Scobel
Doug Scobel
Posted 11/06/2003 02:10AM
#3
It'll work, but you'll find it fairly annoying as I did. The best aperture mask is one having the single biggest hole that just fits in between the secondary and primary mirror and misses the vanes.
That said, the four hole aperture mask is a pretty good way of checking collimation in a big fast dob. Defocusing the image should give four equal bullseyes.
I once used the four hole aperture mask to prove to a colleague that his dob was hopelessly out of collimation, despite his laser collimator telling him that it was perfect.
Renato
That said, the four hole aperture mask is a pretty good way of checking collimation in a big fast dob. Defocusing the image should give four equal bullseyes.
I once used the four hole aperture mask to prove to a colleague that his dob was hopelessly out of collimation, despite his laser collimator telling him that it was perfect.
Renato
Funding Member
