How to make a Hartmann Mask
Posted 14 September 2004 - 11:54 AM
Posted 14 September 2004 - 12:34 PM
Posted 14 September 2004 - 12:43 PM
Posted 17 September 2004 - 09:20 PM
Posted 20 September 2004 - 04:00 PM
Worked out pretty well!!!
I want to make a light box for flat fielding soon. Maybe use the hoop for the part to fits on the scope!!
Thanks for the comments guys...
Posted 21 September 2004 - 09:43 AM
I just made my Hartmann mask last night. I used exactly those items that you had here from a craft shop that I went to. The only thing though was the glue. I went to Sears Hardware store and in the glue section, I came across GORILLA GLUE. I recall reading about that glue somewhere regarding its strength. Although this little bottle of goo was like $8.49, gosh it is incredible how strong it is! Hopefully I will try the mask out tonight!
Posted 21 September 2004 - 12:26 PM
Posted 22 September 2004 - 09:34 AM
Posted 15 November 2004 - 04:22 PM
1.-is this work whit refractor or only on nwt
2.-and how big do we have to punch the hole
for a 85 mm objective
3 at what distance from center
4 who is Hartmann somebody can explain give more details
5 Ps I just find this on google it look a good practice to make one of the hole triangular go to see this http://cometman.com/Mask.html
6 this site show in the second image a new or better way to do maybe some try this succesfully http://www.amtsgym-s...as/ccdfocus.htm
7 last add I ope at this site from they used and other different mask but the interprting of result is VERY VERY interesting maybe we can do somthing like this whitout they sofware do you thing it is possible
Posted 02 December 2004 - 11:25 PM
Posted 29 January 2005 - 03:41 PM
CAN WE SEE SOEM PHOTO OR RESULT
Posted 25 February 2006 - 04:46 PM
I found something handy at WalMart's craft area too. They have a circle cutter (also labelled for scrapbookers) that cuts circles in diameters of any whole number of mm from 25 to 150 (about 1" to 6"). It won't help cutting out the big circles for your big scopes, but it's handled everything I've needed for my little 4" and its finder (I've been getting carried away making bits out of posterboard lately, it's so cheap; I expect I'll be cranking out a black posterboard observatory dome soon). Let me go check the exact name of the device... ah, yes, the "Circle Scissor". It has similar issues of not cutting all the way through thicker materials, and it can be difficult to get it to stay in one place and not jump out of line, but overall quite useful. I might post a picture soonish, since I took a few for a "how to make a cheap light shield" article I'm working on.
OK, I see there's an easy way to add a picture here, so I'll do that. (First time posting here.)
Added: Just happened to be there again today, and checked the price on the "Circle Scissor". It's about $15. A bit much for such an otherwise-cheap project, but can be reused endlessly, of course.