Jerry3672
Vendor - Quantum Astronomy Products
Reged: 01/20/08
Posts: 498
Loc: Lexington NC
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One test complete.
This blows my hartman mask away.
Here is my test image going from in focus to out of focus in both directions.
This was only a very small movement with the focus knob
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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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John Wunderlin
Vendor - Spike-a Focusing Mask
Reged: 10/01/04
Posts: 690
Loc: Mineral Point, Wi
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Beautiful! Did you have a chance to image using the resulting focus point?
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John Wunderlin
Vendor - Spike-a Bahtinov Focusing Mask
Empire Ranch Observatory
Iowa County Astronomers
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Jerry3672
Vendor - Quantum Astronomy Products
Reged: 01/20/08
Posts: 498
Loc: Lexington NC
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I did image 5 of Jupiter's moons. I need to do some work in Photoshop for the final image. Himalia is a mag 15 and Jupiter is -2.5, so I have subs from .001 to 60 seconds.
I plan on using them in the August Challenge in the beginner imaging thread.
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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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Nocturnal
Pooh-Bah
Reged: 09/14/05
Posts: 1022
Loc: CT, USA
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This is the best image I've seen yet to demonstrate a focusing technique. Thanks for posting! I use Nebulosity 2's HFR technique which works very well too. One of the nice things of quantified focusing is that you can chart it to see trends.
How does this mask deal with seeing? Does the central line shift as seeing changes? That would be a terrific benefit of this mask if it's seeing independent.
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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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John Wunderlin
Vendor - Spike-a Focusing Mask
Reged: 10/01/04
Posts: 690
Loc: Mineral Point, Wi
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That's what I currently use as well, but I have to go back and forth many times before I'm comfortable that I've gotten it even close. I usually spend 10-20 minutes messing with focus and by the time I actually image, the focus may have changed! This looks to be a few seconds to lock it exactly. What a time saver! You'd be able to quickly and easily recheck focus between images and scope movement.
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John Wunderlin
Vendor - Spike-a Bahtinov Focusing Mask
Empire Ranch Observatory
Iowa County Astronomers
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Jerry3672
Vendor - Quantum Astronomy Products
Reged: 01/20/08
Posts: 498
Loc: Lexington NC
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Not sure if seeing changes the image. I just used it for the first time last night. I have lots of testing to do.
here is a 60 second exposure of Jupiter. I was attempting to bring in the mag 15 moon Himalia. This was with a Meade DSI Pro. You can see the spikes off of the other moons are equal in all directions. i think the focus was dead on.
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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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Dennis Sakva
Pooh-Bah
Reged: 10/19/04
Posts: 1303
Loc: Kiev, Ukraine
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It works when the seeing is bad too. Seeing will blur the pattern a bit, but you still see where the true focus is. Yesterday it was very windy and the seeing was terrible. Without the mask I wouldn't be able to focus at all. As FHWM was jumping like crazy.
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FoxK
Carpal Tunnel
Reged: 11/07/07
Posts: 2659
Loc: Cape Cod, MA
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I may try to make one..since we got lots of clouds rolling in lol...
I drink ALOT of coffee....seems the plastic covers on the cans can be exacto'd easier than cardboard. Will give it a go 
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Orion 80mm ED Apo Refractor
8" Classic Dob (used as Newtonian on CG5 mount)
Meade 70-AZ-A 70mm Guider using PHD
LS60TCaK/B600/C
CG-5 Advanced GT Mount
Nikon D40x with T-Adaptors
Philips SPC900NC(1/4"ccd)& Quickcam 9000(1/3"CMOS)
Imaging Source DMK 21AU04.AS
- click for cloud prediction for Plymouth, MA. area
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Nocturnal
Pooh-Bah
Reged: 09/14/05
Posts: 1022
Loc: CT, USA
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Ok so that's very interesting indeed to be able to focus through seeing. Thanks!
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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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MtnGoat
Pooh-Bah
Reged: 02/18/07
Posts: 1212
Loc: Columbia Gorge, WA
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gee, thanks for showing us how good it works. now wanting one is even worse!
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"Ignorant people think it's the noise which fighting cats make that is so aggravating, but it ain't so; it's the sickening grammar they use." Mark Twain
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Wmacky
professor emeritus
Reged: 11/24/07
Posts: 583
Loc: Middleburg Fl US
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If someone doesn't take advantange of this opertunuty, i'm buying a water jet, and setting up shop!
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William
C-11 SCT
EON 80ED
CGE
Canon 40D
Phillips SPC900
SS Autoguider
Scopebuggy
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MtnGoat
Pooh-Bah
Reged: 02/18/07
Posts: 1212
Loc: Columbia Gorge, WA
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Heck, a laser engraver can do fairly thick plastic and I'm sure there's a decent plastic for this kind of thing
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"Ignorant people think it's the noise which fighting cats make that is so aggravating, but it ain't so; it's the sickening grammar they use." Mark Twain
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Jerry3672
Vendor - Quantum Astronomy Products
Reged: 01/20/08
Posts: 498
Loc: Lexington NC
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Here is one formula from Pavel. I don't read Russian, but you'll see the calculus formula is universal.
Dennis- Do you know how fogiving this is? My 200mm aperture F4 scope worked well with a 6.7 mm horizontal slot, and 21.4 degree angle.
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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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Dennis Sakva
Pooh-Bah
Reged: 10/19/04
Posts: 1303
Loc: Kiev, Ukraine
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Jerry, the mask is very forgiving to both cut's size and angle between cuts. But the sizes determined by Pavel work really good for CCD chips with 7.4um pixels or close to that (DSLRs).
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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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Quote:
It is too bad that no one is making these for sale!
Blueman
Hopefully this isn't bad form... I've requested my status to be changed as a vendor, but I can't wait to share this. I officially unveiled the Spike-a mask at the Iowa Star Party this weekend.
Spike-a Focusing Mask
It took a few weeks to get the manufacturing kinks worked out, legal pieces in place, etc, but we're ready to start selling these now!
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John Wunderlin
Vendor - Spike-a Bahtinov Focusing Mask
Empire Ranch Observatory
Iowa County Astronomers
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Dennis Sakva
Pooh-Bah
Reged: 10/19/04
Posts: 1303
Loc: Kiev, Ukraine
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Did you contact Pavel Bahtinov - the inventor of this? I see no mention of his name on your page.
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jimguy08
member
Reged: 07/17/08
Posts: 25
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Yes, I too would be interested if Pavel Bahitnov was contacted prior to launching a commercial venture of this sort. He deserves to be mentioned as the originator, yes?
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Celestron C102F Flourite w/Moonlite focuser
Orion 80ED w/Moonlite focuser
Astro-Tech AT66 Guidescope
Atlas EQ-G Bluetooth enabled
Orion SSAG
QHY8
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JAT Observatory
Got Cookies?
Reged: 02/20/05
Posts: 6775
Loc: Eastern PA
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John,
Unless you talked to Pavel I think what you did was while maybe legally OK was ethically wrong, but that is just my opinion.
This is why people shouldn't post ideas without them being patented. As you can see others will take the idea and make money off of someones else's work. Having said that maybe Pavel really wouldn't mind and maybe even hopes that someone will put his idea to good use. If it was me I would have talked to him first.
As a minimum your post should be moved to the vendors forum.
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-Marcus
The problem with free speech is even the stupid have a voice.
http://www.jatobservatory.org
Currently a SV102A, WO 66mm & 10" LX200GPS OTA on a Paramount ME
(these OTAs subject to change without notice)
Edited by JAT Observatory (09/01/08 02:59 PM)
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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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Sorry guys- I'm in new territory here. When lawyers are in the mix, things can get complicated. They told us since this was posted in a public area more than 1 year ago, the information is considered public domain. However, I agree that there should be recognition of the original inventor. I will follow up on this to get it corrected.
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John Wunderlin
Vendor - Spike-a Bahtinov Focusing Mask
Empire Ranch Observatory
Iowa County Astronomers
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Jerry3672
Vendor - Quantum Astronomy Products
Reged: 01/20/08
Posts: 498
Loc: Lexington NC
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I don't think I can comment on this due to the Cloudy nights terms of service and disclosure we all signed up for when becoming a member. I have contacted the Mods and explained that I should be listed as a vendor. If the Mods want to move my comments to the vendor forum, then I'm all for it.
The legal stuff is being handled by a patent attorney. So I can't comment on any of those issues.
Now back to the original idea of the thread that Dennis started. Everyone is welcome to make their own mask based off of the design that Dennis has described.
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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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