smokin oakum
Pooh-Bah
Reged: 09/24/07
Posts: 1497
Loc: Wilmington, NC
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Does this look right? I used 315mm for my clear apeture, 85mm for the central obstuction, 1500mm for the focal length, 100 for the Bahtinov factor, 10 for the angled stripe count, and -1 for the angled stripe offset.
Neil
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Broadcasting live views of the night sky @
Sparkcast
C11 CGE / Hyperstar
MallinCam Hyper Plus Color
Orion 12" XTi f/4.9
MoonLite Focuser
Round Table Platform
12" Parralax rings
Cape Fear Astronomy Club
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Dennis Sakva
Pooh-Bah
Reged: 10/19/04
Posts: 1298
Loc: Kiev, Ukraine
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Hello everyone!
I sent Pavel a message asking him for a permission to use his design for commercial purposes. He has no objections on using the mask for any purposes, including commercial production. As for royalties, he leaves that to producers  If you think you can and want - feel free to do so. His only condition is that you have to mention that the mask was invented by him. "Bahtinov Mask" sounds good, and it is also widely used in Russian speaking forums.
John, I also asked him about your e-mail. He said that it was lost in his Spam folder. Seems like he found it now.
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akira
newbie
Reged: 08/26/08
Posts: 4
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i try to print my mask at an a4 size paper but the firefox doesn't center it at the page ( i have a 200mm newton) how can i center it at the a4 page?
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Mert
Carpal Tunnel
Reged: 08/31/05
Posts: 1750
Loc: Spain, Pamplona
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Quote:
Mert- Your horizontal cuts should start in the center axis and mirror out. I think the odd spacing of the cutouts will make the diffraction spikes wide. they still will be in the center if the axis is centered, but may be too wide to see a clear difference between the angled and straight spikes.
Thanks Jerry for pointing this out, I was out last
night trying the mask I posted.
Never had such a good focus, soo easy and clear in soo
little time, though the spikes were not so clear as
you pointed out!
Still I got FWHM of 2" which is unknown for me
in the area where I live, with the eyes I have to focus.
I will make more masks to try out different setups before
making the final one.
Thanks and regards,
--------------------
------------------
Mert
42º49"N 1º38"W
3" Polarex refractor
6" F12 SW Maksutov,CS2-S
EQ6 + EQMOD 
SPC900NC/DFK21AU04.AS
My web-page don't laugh, I should make it better! 
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Jerry3672
Vendor - Quantum Astronomy Products
Reged: 01/20/08
Posts: 498
Loc: Lexington NC
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Glad we could help you Mert.
I have seen several nice images from Spain. FWHM of 2 is not too bad. That is about all I get here. Once on a very good night I was able to get 1.6.
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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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smokin oakum
Pooh-Bah
Reged: 09/24/07
Posts: 1497
Loc: Wilmington, NC
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Quote:
Does this look right? I used 315mm for my clear apeture, 85mm for the central obstuction, 1500mm for the focal length, 100 for the Bahtinov factor, 10 for the angled stripe count, and -1 for the angled stripe offset.
Neil
Well after I did the first design I thought about what you guys meant by "clear apeture" so I decided to measure the inner opening of my newt, and it came out to 339mm so I redesigned the Mask with those numbers, and came up with this...
Does it look right?
Neil
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Broadcasting live views of the night sky @
Sparkcast
C11 CGE / Hyperstar
MallinCam Hyper Plus Color
Orion 12" XTi f/4.9
MoonLite Focuser
Round Table Platform
12" Parralax rings
Cape Fear Astronomy Club
Edited by smokin oakum (09/11/08 05:38 PM)
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FarmerDave
sage
Reged: 09/07/07
Posts: 412
Loc: Northern Virginia
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Thanks, Adam and Sander!
Now, the news: The new and improved Bahtinov Mask Generator version 0.2!
Here's a list of changes - I think this will address everyone's issues.
- Greatly simplified the generated SVG - seems to fix the Inkscape printing issues, as well as letting Adam adjust the left cutouts. See next item.
- Horizontal stripes now start with a cutout on the center line - since apparently this *is* important.
- Added parameter for controlling number of horizontal cutouts.
- Decoupled the structural bar thickness from edge thickness; added a parameter for specifying the thickness of the structural bars (the up/down and left/right bars).
- Added optional "center line" crosshairs for alignment/testing purposes.
- Elimated "bumps" on outside of circle at the intersection with the structural bars.
- Fixed the background/fill colors so they work completely.
- I changed "Submit" to "Generate!" because I thought it was more exciting that way.
- Decoupled the margin from the edge thickness; added a parameters for left and top margins. Width and height are now calculated as aperture + (2 * edge thickness) + (2 * appropriate margin).
- Added a parameter for the angle of the angled cutouts.
Let me know...
David
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Celestron C6/C9.25/CG-5GT Mount
Orion 80ED/EON 72/Supercharged Atlas EQ-G
Garrett Optical Signature Series 10x50
Canon XTi (soon to be modded)/Canon 40D (unmodded)
Meade DSI/Meade DSI Pro/Philips SPC900N
1944 Ford 2N/1948 Ford 8N
Bahtinov Mask Generator * AstroCataLink * 40DShutterCount
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Dennis Sakva
Pooh-Bah
Reged: 10/19/04
Posts: 1298
Loc: Kiev, Ukraine
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David this is super cool. I wish I had this before I made my mask
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John Wunderlin
Vendor - Spike-a Focusing Mask
Reged: 10/01/04
Posts: 655
Loc: Mineral Point, Wi
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Quote:
Now, the news: The new and improved Bahtinov Mask Generator version 0.2!
Simply awesome! 
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John Wunderlin
Vendor - Spike-a Bahtinov Focusing Mask
Empire Ranch Observatory
Iowa County Astronomers
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blueman
Vendor Blue Sky Accessories
Reged: 07/20/07
Posts: 1390
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Thanks to you for this fine mask generator. You are very kind to make this available.
Blueman
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14.5" Starmaster with ServoCat and Argo Navis
AT 8" RC
TV NP101 f/5.4 APO Telvue .8 Focal Reducer
WO 80mm f/6 APO Televue .8 focal reducer
SBig ST2000xm with CFW-9 filter wheel
Astrodon Gen2 filters RGBL
Baader HA,O-III, H-Beta, S-II Filters
Losmandy G-11 Gemini Auto-guided
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John Wunderlin
Vendor - Spike-a Focusing Mask
Reged: 10/01/04
Posts: 655
Loc: Mineral Point, Wi
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Quote:
Bahtinov Mask Generator version 0.2!
David,
I just noticed a nit- the file name generated is 'bhatinov' but should be 'bahtinov', FYI.
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John Wunderlin
Vendor - Spike-a Bahtinov Focusing Mask
Empire Ranch Observatory
Iowa County Astronomers
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smokin oakum
Pooh-Bah
Reged: 09/24/07
Posts: 1497
Loc: Wilmington, NC
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Hey Jerry, thanks for the help. I have to admit that the math on this has me a bit spun.
I did another one bassed off of your suggestions and using that cool new mask generator. Here were my settings.
First I should tell you that I measured the inner diameter of my OTA and it came out to 13 3/8" or 339.72500 millimeters, and the thickness of the lip of the tube was 1/4" or 6.35 millimeters.
Aperture (mm)339
Edge thickness (mm)6
Structural bar thickness (mm)18
Central obstruction (mm)70
Focal length (mm)1500
Bahtinov factor = 75
Horizontal stripe count = 8
Angle (degrees) = 20
Angled stripe count = 8
Angled stripe offset = -1
This is what I got. What do you think?
--------------------
Broadcasting live views of the night sky @
Sparkcast
C11 CGE / Hyperstar
MallinCam Hyper Plus Color
Orion 12" XTi f/4.9
MoonLite Focuser
Round Table Platform
12" Parralax rings
Cape Fear Astronomy Club
Edited by smokin oakum (09/11/08 05:37 PM)
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isramirez
Pooh-Bah
Reged: 11/04/05
Posts: 1391
Loc: Mexico City
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Hello all,
Yesterday the night i created my first Pavel Bahtinov mask
It is calculated to work with my Maksutov IM715 which has 180mm aperture and 2700 focal length, the cost was only $0.40USD and about 45min of drawing and cutting... the most curious is the result tends to remember me a pacman
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isramirez
Pooh-Bah
Reged: 11/04/05
Posts: 1391
Loc: Mexico City
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Now i just need a night with clear skies... the IM715 is ready for the tests
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Santel MK9 & MK6
IntesMicro 715
Celestron SCT6 & ONIX80 EDF
Meade SN6 & AR6
HiOptic 6in MakCass.Gregory
DBK + DMK + NexImage + LPI
CG-5 & LXD75 Mounts
many EP's, Barlows and Binoviewers
Great astronomic passion 
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xumaxer
sage
Reged: 01/30/06
Posts: 249
Loc: 39º 45' N, 8º 48' W
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Well, I got this for my C11...
Is it right?
Aperture: 280mm
Edge: 15mm
Structural: 10mm
CO:95mm
FL: 5600mm (barlow2x)
Factor: 150
Hoz stripe: 10
Angle: 20º
Angled stripe count: 10
Angled stripe offset: -1
Thx
xumie
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Ciao
xumie
________________________________
C11
FS-102NSV
G-11 Gemini
ST2000XM + CFW10
DMK21AF04.AS
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Jerry3672
Vendor - Quantum Astronomy Products
Reged: 01/20/08
Posts: 498
Loc: Lexington NC
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Quote:
Hey Jerry, thanks for the help. I have to admit that the math on this has me a bit spun.
I did another one bassed off of your suggestions and using that cool new mask generator. Here were my settings.
First I should tell you that I measured the inner diameter of my OTA and it came out to 13 3/8" or 339.72500 millimeters, and the thickness of the lip of the tube was 1/4" or 6.35 millimeters.
Aperture (mm)339
Edge thickness (mm)6
Structural bar thickness (mm)18
Central obstruction (mm)70
Focal length (mm)1500
Bahtinov factor = 75
Horizontal stripe count = 8
Angle (degrees) = 20
Angled stripe count = 8
Angled stripe offset = -1
This is what I got. What do you think?
Glad to help Neil- you have a nice looking design. Now all you need is to cut one out and go have fun.
--------------------
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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snowdragonusa
Pooh-Bah
Reged: 09/04/07
Posts: 1125
Loc: Denver, CO
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Quote:
Well, I got this for my C11...
Is it right?
Aperture: 280mm
Edge: 15mm
Structural: 10mm
CO:95mm
FL: 5600mm (barlow2x)
Factor: 150
Hoz stripe: 10
Angle: 20º
Angled stripe count: 10
Angled stripe offset: -1
Thx
xumie
Nope - Don't use the barlowed FL. Stick with the native 2800. Those slits are WAY too big.
Cheers!
--------------------
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: 1125
Loc: Denver, CO
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David - Awesome job on the update. That generator is just way too cool! Thanks for taking the time to make it up.
Cheers!
--------------------
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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xumaxer
sage
Reged: 01/30/06
Posts: 249
Loc: 39º 45' N, 8º 48' W
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Quote:
Nope - Don't use the barlowed FL. Stick with the native 2800. Those slits are WAY too big.
Cheers!
I thought so!
Thanks Adam, you have been most helpful.
Now, I found a store to laser cut my wonder mask but the guys only work with Corel or AutoCad. 
Can any of you guys please convert my 2 80mm and C11 svg mask files to one of this files?
Most appreciated.
Ciao
xumie
--------------------
Ciao
xumie
________________________________
C11
FS-102NSV
G-11 Gemini
ST2000XM + CFW10
DMK21AF04.AS
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Igor
super member
Reged: 04/20/06
Posts: 124
Loc: Croatia
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Could I just print out my mask on transparent foil and use it without cutting, would that work OK?
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GSO 250/f5 dob
Skywatcher Explorer 130p @ EQ3
Baader modified 350D and bunch of old M42 lenses
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