Gus_Smedstad
Pooh-Bah
Reged: 07/02/06
Posts: 1108
Loc: Boston 42° 16' N 71° 08' W
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Mine, I'm afraid, is remarkably ugly. It's not just that I can't cut a straight line, it's that I printed out the template on a full-sheet label, and for whatever reason the black toner just didn't fuse properly. So I've got this beaten-to-hell look on a brand-new mask.
The circular area is 208mm in diameter, slightly larger than my aperture, and the slats / bars are 3mm each (since S is 5-6.7mm for me). The entire thing is made out of foam board in a 9.25" square, since my outside diameter is 9.25". I have some vague plan of gluing tabs on the edges to keep it in place.
I didn't see any point in making a circle to match my central obstruction.
- Gus
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Gus Smedstad image gallery
Orion Atlas 8 EQ-G
Celestron Onyx 80EDF (guiding / widefields).
Orion Starshoot Autoguider
QHY8
Philips SPC900NC
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cvedeler
Carpal Tunnel
Reged: 12/20/05
Posts: 2124
Loc: Scottsdale, AZ
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Gus, it looks better than mine!!! It isn't so much how it looks but how it works.
You could always shoot some black spray paint over it.
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Chris Vedeler
Astro-Physics 160EDF
Astro-Physics 900GTO
Q453HR / QHY8 CCD camera
Canon 450XSi
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www.aznightsky.com
Scottsdale, AZ
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Gus_Smedstad
Pooh-Bah
Reged: 07/02/06
Posts: 1108
Loc: Boston 42° 16' N 71° 08' W
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This is the template I created in Photoshop - it's designed for a 1000mm f/4.9 telescope.
In retrospect, it might be smarter to reverse that, so the parts to be cut out are black and the remainder is white.
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Gus Smedstad image gallery
Orion Atlas 8 EQ-G
Celestron Onyx 80EDF (guiding / widefields).
Orion Starshoot Autoguider
QHY8
Philips SPC900NC
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Mark Sibole
Pooh-Bah
Reged: 11/30/07
Posts: 1097
Loc: Fife Lake Mi.
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I took 1 of the images posted and resized it for an 80 mm.
I printed it out and laminated it then cut it out.
This was just a test to see how well it would work.
Focus is very easy with it and it worked very very good.
Eventually when it wears out Ill redo it in plastic.
Thanks for starting this topic.
Regards
Mark
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Regards,
Mark Sibole
astronomy.qteaser.com
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jgw12936
professor emeritus
Reged: 03/28/07
Posts: 557
Loc: The Woodlands, TX
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Adam,
The refractor template works perfectly, took about 20 seconds to focus! Thanks for the template.
Jim
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Jim
APM/TMB 80/480
Takahashi FSQ ED 106
AP 155 EDFS
Mach1GTO
FLI Proline 11002M
Starlight Xpress SXV-H9/H9C
http://jimwood.smugmug.com/
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snowdragonusa
Pooh-Bah
Reged: 09/04/07
Posts: 1125
Loc: Denver, CO
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Quote:
Adam,
The refractor template works perfectly, took about 20 seconds to focus! Thanks for the template.
Jim
AWESOME! Thanks for the feedback Jim. Glad it worked out for you.
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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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raf1
super member
Reged: 11/18/05
Posts: 142
Loc: Texas
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Update on the Chinet mask - absolutely awesome! I worked for about 15 minutes to focus the old-fashioned way and thought I was really close - I wasn't. The "spikes" were very clear with the mask and I could easily see movement toward focus. So, for those of you who want to just whip out a Q&D mask to check this out, don't worry about getting the cuts straight or the correct spacing initially. The mask design is very robust and will overcome deviations from perfection quite well. If you look at my mask in a previous post, you'll see what I'm talking about. Looks like I'll be searching for someone to create acrylic masks for my refractors. Again, thanks to all who have contributed to this thread. BTW, I used Alpheratz as my focus star (2.06mag)
Ron
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-Ron
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Too much "stuff" and too little time to use it .....
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raf1
super member
Reged: 11/18/05
Posts: 142
Loc: Texas
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Adam - your template worked great. Thanks again.
Ron
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-Ron
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Too much "stuff" and too little time to use it .....
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snowdragonusa
Pooh-Bah
Reged: 09/04/07
Posts: 1125
Loc: Denver, CO
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Great Ron! Glad the Chinet Experiment worked (wasn't that a movie?)! DOn't forget to keep that plate away from the others. I'd hate for someone to mistake it for a regular plate and have their BBQ ribs go sloppin on to their lap!
I just received my two masks from the cutters and they are beautiful! I had come up with the refractor modification after I had placed my order so there was no changing. I had them cut some tabs for me as well which I am in the process of bonding. Here are a couple of pictures.
The little paper mask was my demo to see just how well focusing would turn out as I mentioned in a previous post.
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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: 1125
Loc: Denver, CO
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This picture shows how the tabs allow the mask to fit over the scope's dew shield. I plan on adding some small pieces of felt to the tabs as well for a firm fit and scope protection.
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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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raf1
super member
Reged: 11/18/05
Posts: 142
Loc: Texas
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Adam, those look great! I still can't believe how well the Bahtinov mask works. Heck, mine looks like it was made with a chainsaw and it still works great. I wish we had discovered this years ago. All those images to do over!
P.S. - pretty close on that movie title - China Syndrome. And I'll only let folk use the mask for dipping beans out of the pot - darn, I wonder how that would work. Gotta go and file that paperwork to protect my rights to the Chinet Focus Mask and Bean Strainer. Now that's cool.
Have a great weekend.
Ron
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Mark Sibole
Pooh-Bah
Reged: 11/30/07
Posts: 1097
Loc: Fife Lake Mi.
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Here is an image using the focus mask.
Focus is to easy with it.
Regards
Mark
http://astronomy.qteaser.com/images/NGC281-SiiHaOiii.jpg
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Regards,
Mark Sibole
astronomy.qteaser.com
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Joe F Gafford
professor emeritus
Reged: 12/15/06
Posts: 509
Loc: Denver, Colorado, US
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All, be wary of using foamboard for use outside. It may warp on you. I have a piece of black foamboard I use as a light block on the back of my 10" Newtonian. It has warped over time due to heat of the day and the dewing at night. Foamboard is plastic foam with paper coverings. The paper and adhesive are the culprits here, especially if one side is more to the weather than the other. The curves that form are permanent. As with my light block, creases were formed when I readjusted it to fit the back of the scope. No problem there, but may be a concern with this kind of mask.
Joe.
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JMI 18" f4.5 Newtonian, split ring mount
10" f4.5 Newtonian on GEM (was a DS-10 once upon a time)
50 and 110 mm Mamiya RZ lenses with homemade adapter
ST-2000XM camera
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jgw12936
professor emeritus
Reged: 03/28/07
Posts: 557
Loc: The Woodlands, TX
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Ron,
It must be something about Southeast Texas, we see something that looks good and we just have to try it for ourselves, I have to admit, your reverse engineering with the highly technical Chinette plate was genious! Glad it worked, and as Adam said, watch out for the BBQ
Jim
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Jim
APM/TMB 80/480
Takahashi FSQ ED 106
AP 155 EDFS
Mach1GTO
FLI Proline 11002M
Starlight Xpress SXV-H9/H9C
http://jimwood.smugmug.com/
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btieman
sage
Reged: 07/24/08
Posts: 466
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I have a 2800mm fl scope. I often image with a 2x barlow and I sometimes image with a 3.3 fr.
924mm ~= 4-6mm
2800mm ~= 14-18mm
5600mm ~= 28-37mm
I need 3 different masks right? I don't understand the angle relationship--do the 3 need different angles as well?
Anyone starting to get an idea of how far off your focal length can be before problems start?
Brian
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CPC 1100
Orion 120st
Milburn Wedge
QSI 520i
Meade DSI Pro
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Joselo
sage
Reged: 02/26/08
Posts: 388
Loc: Texas
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This is truly "REVOLUTIONARY"
Has anyone made a mask for an FSQ106ED ?
One more thing, I would really like for this invention to be patent, and protect the inventor's rights.
DO NOT LET THE CHINESE STEAL THIS, they are experts in copyright infringements, and will make more money than you can imagine, believe me.
  
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Nocturnal
Pooh-Bah
Reged: 09/14/05
Posts: 1004
Loc: CT, USA
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Quote:
This is truly "REVOLUTIONARY"
Has anyone made a mask for an FSQ106ED ?
One more thing, I would really like for this invention to be patent, and protect the inventor's rights.
DO NOT LET THE CHINESE STEAL THIS, they are experts in copyright infringements, and will make more money than you can imagine, believe me.
I think you may want to read up on patent law a bit before you post messages like this. How can the Chinese (or anyone else) *steal* something that's out in the open and freely available to everyone? Mr Bahtinov did not patent his invention and we should all be thankful for that. Near as I can tell anyone can make one for him/herself or produce thousands of them to sell to anyone who wants one.
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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: 1125
Loc: Denver, CO
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Quote:
I have a 2800mm fl scope. I often image with a 2x barlow and I sometimes image with a 3.3 fr.
924mm ~= 4-6mm
2800mm ~= 14-18mm
5600mm ~= 28-37mm
I need 3 different masks right? I don't understand the angle relationship--do the 3 need different angles as well?
Anyone starting to get an idea of how far off your focal length can be before problems start?
Brian
Hey Brian,
So far I don't think there is a huge difference in the spacing so long as it is close. The 924mm FL from the FR can be adjusted with the 3*924/150= ~18mm (9mm cut, 9mm spaced)
That is just about same measurement for the native FL of 2800mm
The real question comes into effect with the use of a barlow. My suggestion is to try it out. I am going out tonight to a star party and will try my 2x and 3x barlows with my mask and see if there is any difference.
My guess is that there will not be.
I'll post back tonight or tomorrow.
Cheers!
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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: 1125
Loc: Denver, CO
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Quote:
Here is an image using the focus mask.
Focus is to easy with it.
Regards
Mark
http://astronomy.qteaser.com/images/NGC281-SiiHaOiii.jpg
Great image Mark!
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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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groz
Pooh-Bah
Reged: 03/14/07
Posts: 1038
Loc: Duncan, BC
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Quote:
One more thing, I would really like for this invention to be patent, and protect the inventor's rights.
It's kind of late for that, the photos are published, the description is published. Unless somebody filed for patents prior to publishing, then the net is already full of 'prior art'.
The USPO will surely issue a patent if somebody files in the usa, but that's only because they dont research applications. The resultant patent wont be worth the paper it's written on, because the first attempt to enforce it will result in prior art being shown in court, and the patent wont hold up. There's more than ample prior art on the net already. Any patent issued on this will only have value if the filing is dated prior to the original publications of the concept by pavel. Anything filed after that, is worthless, even if the patent gets issued.
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