Dennis Sakva
Pooh-Bah
Reged: 10/19/04
Posts: 1303
Loc: Kiev, Ukraine
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I don't think anyone here is questioning the legality of you making the masks available for sale. And yes, anyone can do it. It's just seem fair that you mention inventor's name and probably share some profits with him.
Just in case.
By no way I'm financially associated with Pavel. I know him only as a very knowledgeable person always willing to help.
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Tomvictor
professor emeritus
Reged: 08/09/04
Posts: 509
Loc: N.59.11.47. Norway
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Let me see if I got it right. Can I use the same mask on my FSQ at f/3.6 - f/5 and f/8?
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Tom Victor
http://www.ccd-astrophoto.com/
Takahashi EM-200 - 10" LX200ACF - Artemis 4021M - Mini Borg 60ED - FLI CFW - DSI PRO II. Canon EF200L f/2.8 - 450D - Baader mod. 350D.
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John Wunderlin
Vendor - Spike-a Focusing Mask
Reged: 10/01/04
Posts: 690
Loc: Mineral Point, Wi
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I tested the 12" version with an F4.7 XT10 and and F10 LX50-10" - it worked well in both scopes.
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John Wunderlin
Vendor - Spike-a Bahtinov Focusing Mask
Empire Ranch Observatory
Iowa County Astronomers
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Tomvictor
professor emeritus
Reged: 08/09/04
Posts: 509
Loc: N.59.11.47. Norway
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Thanks John.
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Tom Victor
http://www.ccd-astrophoto.com/
Takahashi EM-200 - 10" LX200ACF - Artemis 4021M - Mini Borg 60ED - FLI CFW - DSI PRO II. Canon EF200L f/2.8 - 450D - Baader mod. 350D.
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snowdragonusa
Pooh-Bah
Reged: 09/04/07
Posts: 1128
Loc: Denver, CO
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Dennis,
What did you make your mask out of? $150 ++ is a little steep for me so I am going to make my own.
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Adam
12" LX200R, AT80LE
Lunt 60mm Ha & CaK solar scopes
DMK41.AS, DSI Pro, DSI-C, LPI
Denver Astronomical Society
Brighton Astronomical Group
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Dennis Sakva
Pooh-Bah
Reged: 10/19/04
Posts: 1303
Loc: Kiev, Ukraine
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I didn't do it by myself. I ordered one at local shop that specializes on advertisement materials. They sell lots of self gluing films, light boxes, etc. They also offer laser cutting services. The 10" one made of 3mm acrylic cost me around $30 to cut. You can also cut one from thick plastic sheet with x-acto knife, but that's not very easy. Though my friend cut 150mm one without too much trouble (he is very diligent). You can also glue black stripes of paper over the mask instead of cutting them.
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Tomal
super member
Reged: 03/24/08
Posts: 111
Loc: Norway
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Adam, how do you plan to make this mask ?
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Celestron C8 203mm f/10
Meade 5000 series APO 80mm f/6
Sky-Watcher Newtonian 203mm f/5.9
Sky-Watcher Maksutov-Cassegrain 80mm f/12,5
Sky-Watcher Finder/Guide scope 50mm f/4
CG-5 GT
Canon 40D (Unmod)
SSAG
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snowdragonusa
Pooh-Bah
Reged: 09/04/07
Posts: 1128
Loc: Denver, CO
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Thanks Dennis for the info. I'll call around to some of our local shops to see if they also offer this service. Otherwise I'll look into making my own out of a sturdy plastic.
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Adam
12" LX200R, AT80LE
Lunt 60mm Ha & CaK solar scopes
DMK41.AS, DSI Pro, DSI-C, LPI
Denver Astronomical Society
Brighton Astronomical Group
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snowdragonusa
Pooh-Bah
Reged: 09/04/07
Posts: 1128
Loc: Denver, CO
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I downloaded the InkScape opensource software Dennis had mentioned and worked my way through how to use it. I finally came up with this design.
I have calls out to various laser cutters in town for quotes. I will most likely go with a black opaque acrylic rather than aluminum unless I can find a place that has the anodized. I don't want to be placing spray painted surfaces next to my optics. My size is for the 12" SCT so the slats are 10mm wide and spaced 10mm. The central obstruction is 10cm and the entire diameter for the full disc is 35cm.
I really like the way it turned out and can't wait to try it out!
I named it the Pavel Mask.. I thought it was a fitting name. 
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Adam
12" LX200R, AT80LE
Lunt 60mm Ha & CaK solar scopes
DMK41.AS, DSI Pro, DSI-C, LPI
Denver Astronomical Society
Brighton Astronomical Group
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snowdragonusa
Pooh-Bah
Reged: 09/04/07
Posts: 1128
Loc: Denver, CO
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I just placed an order with a local company that will cut it out of a 3mm black opaque acrylic for me for $37. I think I will bond a couple of acrylic "hangers" on it so it will not fall off.
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Adam
12" LX200R, AT80LE
Lunt 60mm Ha & CaK solar scopes
DMK41.AS, DSI Pro, DSI-C, LPI
Denver Astronomical Society
Brighton Astronomical Group
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Jerry3672
Vendor - Quantum Astronomy Products
Reged: 01/20/08
Posts: 498
Loc: Lexington NC
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Nice Drawing Adam. That looks like it will work just fine.
With your 12" LX200 and a DSI pro you should be able to focus on a Mag 6 or 7 star with no problem.
Keep us posted on how it works.
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Meade LXD75-SN-8, SN-10, C11
DSI Pro
Canon XSi 450D unmod
www.spike-a.com Bahtinov Style Focus Mask
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mikefulb
super member
Reged: 04/17/06
Posts: 167
Loc: Central NC
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Saw this article the other day and I had to try it out. I went low tech and cut out a mask from some heavy felt-like material I found at a craft store and built a simple wooden frame. Going to try it out tonight!
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Michael Fulbright
http://msfastro.net
Edited by mikefulb (09/02/08 07:46 PM)
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snowdragonusa
Pooh-Bah
Reged: 09/04/07
Posts: 1128
Loc: Denver, CO
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Nice Michael! Let us know how it works. If I wasn't able to find a place here in Denver that could cut my drawing for my I was going to go that very route.
Good luck mate!
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Adam
12" LX200R, AT80LE
Lunt 60mm Ha & CaK solar scopes
DMK41.AS, DSI Pro, DSI-C, LPI
Denver Astronomical Society
Brighton Astronomical Group
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Nocturnal
Pooh-Bah
Reged: 09/14/05
Posts: 1022
Loc: CT, USA
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I would also like to make mine out of flexible material so I'm curious to read how this works for you!
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Best,
Sander
C11-HyperStar on Atlas EQ-Q driven by EQMOD
William Optics M110 With FR-III/TRF-2008
DS2090 guide scope
QHY-8, DSI-Pro and DSI cameras
watec 802h video camera with KIWI OSD
Astro stuff: http://www.tungstentech.com
My Astro Photos
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snowdragonusa
Pooh-Bah
Reged: 09/04/07
Posts: 1128
Loc: Denver, CO
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I started thining about it a little more and decided to have the shop cut a smaller one for my 80mm scope. I tried just scaling it first and it worked perfectly according to the equation and my particular scopes. I also added a few extra pieces that I can fashion into 'hangers'.
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Adam
12" LX200R, AT80LE
Lunt 60mm Ha & CaK solar scopes
DMK41.AS, DSI Pro, DSI-C, LPI
Denver Astronomical Society
Brighton Astronomical Group
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Snow dog
Carpal Tunnel
Reged: 07/17/05
Posts: 1778
Loc: Alberta Canada
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Quote:
I downloaded the InkScape opensource software Dennis had mentioned and worked my way through how to use it. I finally came up with this design.
I have calls out to various laser cutters in town for quotes. I will most likely go with a black opaque acrylic rather than aluminum unless I can find a place that has the anodized. I don't want to be placing spray painted surfaces next to my optics. My size is for the 12" SCT so the slats are 10mm wide and spaced 10mm. The central obstruction is 10cm and the entire diameter for the full disc is 35cm.
I really like the way it turned out and can't wait to try it out!
I named it the Pavel Mask.. I thought it was a fitting name.
I like your design also. What's the angle that the right side slots are cut at? It looks like it's around 35 deg or so. Left side looks like 90. Thanks.
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Marc
Someone get these crazy dogs off me
12" LX200 Classic
ETX-90PE
Meade DSI
Canon AE-1, EOS Rebel 350
My Home Page
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snowdragonusa
Pooh-Bah
Reged: 09/04/07
Posts: 1128
Loc: Denver, CO
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Quote:
I like your design also. What's the angle that the right side slots are cut at? It looks like it's around 35 deg or so. Left side looks like 90. Thanks.
Yup, the left side is 90 degrees, the right top side is +20 degrees while the right bottom is -20 degrees.
They will cut tomorrow so I should get them by Friday hopefully.
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Adam
12" LX200R, AT80LE
Lunt 60mm Ha & CaK solar scopes
DMK41.AS, DSI Pro, DSI-C, LPI
Denver Astronomical Society
Brighton Astronomical Group
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John Wunderlin
Vendor - Spike-a Focusing Mask
Reged: 10/01/04
Posts: 690
Loc: Mineral Point, Wi
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Looks great. I also tried printing the pattern on a blank transparency, but it seems to be important to have the clear openings. I think the transparency material wasn't optically clear enough.
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John Wunderlin
Vendor - Spike-a Bahtinov Focusing Mask
Empire Ranch Observatory
Iowa County Astronomers
Edited by John Wunderlin (09/02/08 10:43 PM)
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Nocturnal
Pooh-Bah
Reged: 09/14/05
Posts: 1022
Loc: CT, USA
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That's actually a great idea Some overhead sheets for printers are quite matte to make the ink stick. If yours were clear I'm not sure why it wouldn't work with a bright enough star.
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Best,
Sander
C11-HyperStar on Atlas EQ-Q driven by EQMOD
William Optics M110 With FR-III/TRF-2008
DS2090 guide scope
QHY-8, DSI-Pro and DSI cameras
watec 802h video camera with KIWI OSD
Astro stuff: http://www.tungstentech.com
My Astro Photos
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mikefulb
super member
Reged: 04/17/06
Posts: 167
Loc: Central NC
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Ok just tested my mask made from thick felt on my Takahashi Epsilon 180ED and it works just awesome. The scope is 500mm and f/2.8 so focusing is always a PITA. I only tried focusing on brighter stars but it was very trivial to get perfect focus. The out of focus images looked very similar to the animation someone posted earlier. I could move the focuser in increments of 3 Robofocus steps (I think that corresponds to 1/1200 of a turn of the focus shaft) and see distinct changes in the diffraction pattern.
I thought about using a clear transparency sheet and printing the pattern but I was worried the sheet would slightly affect the focus position and so when I removed it then I would still be slightly out of focus. Make sense?
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Michael Fulbright
http://msfastro.net
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