anat
sage
Reged: 06/03/04
Posts: 236
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I place the mask in protection filters. I screw in the masks when focusing my Borg 60ed and canon lens.
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Astro-physics 155EDT
Borg 60ED
Losmandy G11 Gemini
Hypermodded Canon 450D
LVI SmartGuider
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FarmerDave
sage
Reged: 09/07/07
Posts: 414
Loc: Northern Virginia
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anat -
Thanks for sharing! Would love to see some images of the spikes on the camera lens with the mask on.
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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FarmerDave
sage
Reged: 09/07/07
Posts: 414
Loc: Northern Virginia
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"He likes it! Hey Mikey!"
Craig Stark weighs in on the Bahtinov Mask.
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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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bill w
Postmaster
Reged: 03/26/05
Posts: 6571
Loc: southern california
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awesome for focus:
not so good for DSO's 
who hasn't done this at least once?
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-bill w
nexstar 8 GPS
canon 300D, Toucam Pro II
SXV-H9C, H9, SX Exview autoguider, SX-AO
FS 102 (OLV), FS60 CSV, 8" LX200R, G 11
http://whwastro.homestead.com/
image processing monitor calibrated to just differentiate darkest boxes:
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Nocturnal
Pooh-Bah
Reged: 09/14/05
Posts: 1022
Loc: CT, USA
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Oh sure, blew away a few subs because of that a few weeks ago. One of the reasons I monitor my imaging session with DeepSkyStacker Live. If my FWHM values and star counts are too low I know there's trouble.
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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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Galaxyhunter
Pooh-Bah
Reged: 01/02/06
Posts: 1247
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Quote:
who hasn't done this at least once?
Of coarse I have.
But after a half dozen beers, It will look just about right. 
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Carl
My lousy skies at Hawkeye Observatory
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NyxAither
Pooh-Bah
Reged: 09/11/07
Posts: 1269
Loc: Arlington VA
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Haha!!! You guys left the mask on? (-: That's pretty funny.
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http://www.astrophotogallery.org/showgallery.php/ppuser/169/cat/500
✸Orion XT8i✸Orion80-T✸CG5 GT✸Meade DSI II✸Meade DSI(TY TODD N!!!)✸Orion 4.5" Reflector✸Mac Powerbook G4✸10x50 binocs✸SPC900NC✸
Thomas
..::*~*Clear Skies*~*::..
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Hermit
member
Reged: 10/26/08
Posts: 48
Loc: Northern California
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Anyone had success making a mask for a piggyback camera? I made one for my Sony DSC-R1 that has a 24 to 120 (35mm equivalent) zoom lens, but I could not get the diffraction pattern.
Best regards,
Rob Crockett
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Meade LX90 LNT 8" Schmidt-Cassegrain
Standard Wedge, LX90 fork, LX200 tripod
Alan Gee II telecompressor f/5.6
Baader short 1.5cm T-adapter/T-ring
Astronomik CLS-CCD clip filter
Self modified Canon XSi with Baader UV/IR filter.
Meade Model 277 60mm refractor with Orion SSAG
Losmandy V-dovetails for balance and guide scope.
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raf1
super member
Reged: 11/18/05
Posts: 145
Loc: Texas
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I have had excellent success with the Bahtinov mask and use it exclusively for my focus requirements. There will come a time when I will want to employ automation software for unattended image capture. Since this would involve using focusing software without using a mask, I wonder if anyone has focused using FocusMax and compared the result to that achieved by the Bahtinov mask. Would be an interesting comparison.
Thanks.
Ron
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-Ron
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Too much "stuff" and too little time to use it .....
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MartyT
professor emeritus
Reged: 09/28/07
Posts: 682
Loc: Kansas City
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Quote:
Anyone had success making a mask for a piggyback camera? I made one for my Sony DSC-R1 that has a 24 to 120 (35mm equivalent) zoom lens, but I could not get the diffraction pattern.
Try a brighter star and longer exposure.
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Celestron CGE / C-11 (CGE-1100)
Megrez 90 FD APO / 0.8x FR/FF vIII
QHY8, 350D, DSI Pro, SPC900NC
KWIQ Guider (QHY5)
ETX-125AT
12" Lightbridge
My Astrophoto Gallery
Astronomical Society of Kansas City
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MartyT
professor emeritus
Reged: 09/28/07
Posts: 682
Loc: Kansas City
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Quote:
I wonder if anyone has focused using FocusMax and compared the result to that achieved by the Bahtinov mask. Would be an interesting comparison.
Not FocusMax, but Craig Stark (PHD / Nebulosity author) posted an article in his blog recently where he compares the focus using the mask vs. Nebulosity's focus routine.
http://www.stark-labs.com/blog/files/NebBahtinov.php
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Celestron CGE / C-11 (CGE-1100)
Megrez 90 FD APO / 0.8x FR/FF vIII
QHY8, 350D, DSI Pro, SPC900NC
KWIQ Guider (QHY5)
ETX-125AT
12" Lightbridge
My Astrophoto Gallery
Astronomical Society of Kansas City
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raf1
super member
Reged: 11/18/05
Posts: 145
Loc: Texas
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Hey thanks Marty - I missed that.
Ron
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-Ron
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Too much "stuff" and too little time to use it .....
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Poochpa
professor emeritus
Reged: 02/12/05
Posts: 503
Loc: Buffalo Burbs, NY
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I had a local sign company make a Bahtinov mask out of acrylic for my 4" refractor. The homemade cardboard one I made worked well, so I can't wait to try this one out. Thanks to Pavel and those here at CN who helped bring us this great focusing tool!
Mike
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Televue NP101
Vixen GPDX/Skysensor 2000PC
Meade 8" LX200GPS
WO Zenithstar 66SD
Modified Canon Rebel XSi
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jilldwr
super member
Reged: 02/17/06
Posts: 151
Loc: Ontario, Canada
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I tried getting one for a C8 cut with a water jet machine. They wanted over $100 if I supplied the UPVC sheet (McMaster-Carr $20). I gave in and ordered one from www.focus-mask.com for $40+shipping. The foam-core one I made wasn't so resilient after all...
DW
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Celestron C8/ 90mm Flourite Triplet/6"F5 Newt-Astrograph/WO66
Losmandy GM100/ Custom Designed GEM
Orion Autoguider/ Canon 350T DSLR/ Stiletto Focuser
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Buzzer
professor emeritus
Reged: 07/21/07
Posts: 658
Loc: Long Island, NY
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Hello All,
I had a laugh with the mask and M-45. I shot it with my Canon 40D ( I am on the list for a QHY8 ) See you soon.
Hey Pavel, thank you very much, Andy
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Meade SN-10 Carbon Fiber
TMB 92ss
Mini Borg 50 Guidescope
Celestron CGE Mount
QHY8
Orion Starshoot Autoguider
http://buzzer.zenfolio.com/
"I THINK THE WEATHERMAN NEEDS MORE EXPENSIVE EQUIPMENT"
WANING CRESCENT OBSERVATORY
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Yedgy
sage
Reged: 07/22/08
Posts: 457
Loc: Phoenix, AZ, USA
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Wow, I can't believe I read an entire 22-page thread, but this one has been great! Yesterday I used the wisdom gathered here to create a Bahtinov mask for my 4" Stellarvue using black cardstock and an embroider hoop. The results were stunning! Perfect visual focus in just a few seconds. Unfortunately it was cloudy last night here in Phoenix so I had only a few minutes to try it out. I'll try it out again tonight, this time with the camera. My big thanks to out to everyone who had a hand in putting this thread together!
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The Universe is an awesome place. I'm glad I live here.- Takahashi FS-60CB
- HyperTuned Atlas EQ-G
- Mountain Instruments MI-8P pier
- Spectrum-Enhanced Canon EOS 450D
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Bill Richards
journeyman
Reged: 04/19/07
Posts: 5
Loc: Tucson, Arizona
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This looks like just what I need for my C11/Hyperstar 3 setup. Its a wonderful system and works well with my DSLR, but it's difficult to focus. I'm assuming that since the C11 with the Hyperstar is effectively f/2, I should, for the calculation, use a F.L. of 560mm (2x280) rather than the native F.L. of 2800mm. Could anyone comment? Thanks.
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Bill Richards
Celestron C11
William Optics ZS-105, ZS-80ST
Hyperstar 3
Canon/Hutech 350D
CCD Labs Qguide
Tak EM-200 Temma II
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smokin oakum
Pooh-Bah
Reged: 09/24/07
Posts: 1497
Loc: Wilmington, NC
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Quote:
This looks like just what I need for my C11/Hyperstar 3 setup. Its a wonderful system and works well with my DSLR, but it's difficult to focus. I'm assuming that since the C11 with the Hyperstar is effectively f/2, I should, for the calculation, use a F.L. of 560mm (2x280) rather than the native F.L. of 2800mm. Could anyone comment? Thanks.
No, you would still use the 2800mm fl.
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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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Jerry3672
Vendor - Quantum Astronomy Products
Reged: 01/20/08
Posts: 498
Loc: Lexington NC
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Bill- You have asked the magic question that has puzzled many people about the Bahtinov mask.
If you want to focus using the first order then you need to optimize your cuts for f2 for the hyperstar. However the third order can be used to focus.
Here is a photo of a Mag 3 star with a C11 F10 taken with a DSLR camera. This mask is optimized for F4, but you see the third order still is very effective for focus.
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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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Bill Richards
journeyman
Reged: 04/19/07
Posts: 5
Loc: Tucson, Arizona
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Jerry - So then using the Mask Generator I would use 2800 for the F.L. and 50 for the Bahtinov factor (for 3rd order)?
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Bill Richards
Celestron C11
William Optics ZS-105, ZS-80ST
Hyperstar 3
Canon/Hutech 350D
CCD Labs Qguide
Tak EM-200 Temma II
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