isramirez
Pooh-Bah
Reged: 11/04/05
Posts: 1391
Loc: Mexico City
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Quote:
Now that is one nice looking Bahtinov Mask!!! 
Bet that Adam  it is 100% inspired on the first file you sent me 
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snowdragonusa
Pooh-Bah
Reged: 09/04/07
Posts: 1125
Loc: Denver, CO
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Quote:
Quote:
Now that is one nice looking Bahtinov Mask!!!
Bet that Adam it is 100% inspired on the first file you sent me
Cheers 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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jgraham
Postmaster
Reged: 12/02/04
Posts: 6695
Loc: Dayton, Ohio
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Wow, that's a nice looking mask. Much better than my hack.
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-John
================================================
Homebuilt scopes from 4.25-16.5"
Meade LXD75-N6/SN6/SC8, DSX-90, ETX-60BB, ETX-125PE, DS-2130
Orion StarBlast, BinoViewers, Coronado PST
Rebel XT/XTi, DSI Pro (I, II, & III), DSI, LPI, Electronic Eyepiece, Phillips SPC900NC
Tasco 60mm Refractors
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cvedeler
Carpal Tunnel
Reged: 12/20/05
Posts: 2124
Loc: Scottsdale, AZ
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Quote:
A mate in Mexico, Pedro Gonzalez, created his Pavel mask for only $8USD, look
Is that made out of black foam board? If not, what is it made of? It looks really nice. Much nicer than my attempt. Perhaps you and your mate could open an export business. I know I would be interested.
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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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John Wunderlin
Vendor - Spike-a Focusing Mask
Reged: 10/01/04
Posts: 655
Loc: Mineral Point, Wi
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I used the mask to image the beginning DSO contest this month- best focus I've ever had in a Deep sky object, and it took me under a minute to get it!
Here's a link to the full resolution version. You have to click on the magnifying icon to zoom in.
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John Wunderlin
Vendor - Spike-a Bahtinov Focusing Mask
Empire Ranch Observatory
Iowa County Astronomers
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mikefulb
super member
Reged: 04/17/06
Posts: 167
Loc: Central NC
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I did some more tests with my mask last night operating at 500mm (f/2.8) on my Epsilon.
I discovered that best overall focus (reported by ccdinspector) occurred when the lines did not quite intersect. This struck me as odd.
My only idea is that the camera is tilted very slightly and so to reach best overall focus over the chip I have to slightly defsous the center.
So I moved the star into all corners of the CCD but the diffraction pattern did not change enough for me to detect by eye.
I'm wondering if at f/2.8 the critical focus region is so small its going to be difficult to visually detect differences.
Has anyone focused a telescope faster than f/4 with this mask?
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Michael Fulbright
http://msfastro.net
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Mert
Carpal Tunnel
Reged: 08/31/05
Posts: 1750
Loc: Spain, Pamplona
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Hi all,
Just finished a little drawing to make a mask for my
Mak 6"/F12 so the spacing calculated would need to be
6mm ( 6mm gap and 6mm spacing ).
Would this work ok?
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------------------
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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snowdragonusa
Pooh-Bah
Reged: 09/04/07
Posts: 1125
Loc: Denver, CO
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Quote:
I did some more tests with my mask last night operating at 500mm (f/2.8) on my Epsilon.
I discovered that best overall focus (reported by ccdinspector) occurred when the lines did not quite intersect. This struck me as odd.
My only idea is that the camera is tilted very slightly and so to reach best overall focus over the chip I have to slightly defsous the center.
So I moved the star into all corners of the CCD but the diffraction pattern did not change enough for me to detect by eye.
I'm wondering if at f/2.8 the critical focus region is so small its going to be difficult to visually detect differences.
Has anyone focused a telescope faster than f/4 with this mask?
Curious...
What was the gap you used between each cut out? If you do a 3*500/150=10mm then you should have 5mm between each cut out slit. Was the mask bent or warped at all?
Cheers,
Adam
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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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isramirez
Pooh-Bah
Reged: 11/04/05
Posts: 1391
Loc: Mexico City
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Quote:
Is that made out of black foam board? If not, what is it made of?
As i know it was made of 3mm wooden MDF and then black painted
Quote:
Perhaps you and your mate could open an export business. I know I would be interested.
We understand the business side is reserved only for Pavel Bahtinov... i'm sure the chinese companies as Synta, GSO, etc. can easly provide masks for every single scope available worlwide at a very affordable cost think they just need to contact Pavel Bahtinov in order to ensure expert advice from him 
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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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cvedeler
Carpal Tunnel
Reged: 12/20/05
Posts: 2124
Loc: Scottsdale, AZ
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I just found this site:
http://www.stencilsonline.com/index.html
Looks promising. I'm waiting for a quote.
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Chris Vedeler
Astro-Physics 160EDF
Astro-Physics 900GTO
Q453HR / QHY8 CCD camera
Canon 450XSi
----------------------------
www.aznightsky.com
Scottsdale, AZ
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Jerry3672
Vendor - Quantum Astronomy Products
Reged: 01/20/08
Posts: 498
Loc: Lexington NC
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Dr Mike-It is very important that the cut outs are a mirror of each other and centered to the optical axis. Check and see if your lines are straight. Trace out your mask on paper and then flip it face down and see if the axis is centered and the lines are a mirror.
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.
isramirez- Contacting Pavel is more difficult that I thought. I've made an attempt, but without speaking Russian it is very difficult. Maybe someone will invite him to join cloudy nights.
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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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I did use the 10 mm spacing as you suggest. I don't believe there was significant warpage but it is something I will investigate next time out.
How sensitive do you think the mask is to warpage?
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Michael Fulbright
http://msfastro.net
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jimguy08
member
Reged: 07/17/08
Posts: 17
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Here's one of many online custom laser cutting businesses:
http://www.customlasercutting.com/
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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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blueman
Vendor Blue Sky Accessories
Reged: 07/20/07
Posts: 1391
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Let us know what happens with the stencil cutting, that would be a great way to get them made cheaply.
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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snowdragonusa
Pooh-Bah
Reged: 09/04/07
Posts: 1125
Loc: Denver, CO
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Quote:
I did use the 10 mm spacing as you suggest. I don't believe there was significant warpage but it is something I will investigate next time out.
How sensitive do you think the mask is to warpage?
Actually Mike, I think your issue is the placement of your 90 degree center line. If you look at its placement you will see it is just slightly off center to where the V of the 20 degree lines meet. I think this is the fundimental reason behind your 'just off center' defraction pattern. Try another go (or just rescale the one I had posted earlier) and see if that helps with the fast f/2.8 of your scope.
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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DugDog
Pooh-Bah
Reged: 12/19/07
Posts: 1236
Loc: Temecula, Ca. USA
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With Adam's file, I create my version of the "Amazing Bahtinov Mask".
First I taped the pattern on a 2MM Thick black Foam Sheet, cost 0.42 cents per 9 X 12 Sheet. This project required two sheets 0.84 cents.
Took an exacto knife, and cut out the pattern on the foam sheet.
I made a sleeve out of the foam sheet too, and then mounted the mask on the foam sleeve...packing tape to seal the sleeve to the mask.
Here it is mounted on the scope...had to buy some "Glow in the Dark Stars" to put some bling bling on the sleeve. Cost $1.96 for the bling...ouch, had to pay big bucks for the bling, but it looks kewl
Total cost = $2.80 (with the Glow in The Dark Stars).
Next I will have to do a first light test.
I must thank Adam  for making a cool file, and I must thank Dennis for always coming to these forums with great topics!
DD
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Orion StarShoot Pro V1.
EON 120, EON 72, and 80MM F11.4 Guide Scope.
Atlas Mount.
Celestron CPC 800 XLT
http://myastroimages.com
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snowdragonusa
Pooh-Bah
Reged: 09/04/07
Posts: 1125
Loc: Denver, CO
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Awesome bling Doug! Nice job!
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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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akira
newbie
Reged: 08/26/08
Posts: 4
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hi i'm new to this forum and i followed this link from another forum. my questions for this mask are two
1. since i am the owner of an 8'' dob and i am starting astrophotography with an heq5 pro mount do i need this mask for focusing or is it only for SCTs, MACs etc?
2. the angled bars are at 40 degrees from the center of the of the mask or 20 degrees (i saw this value at another forum)
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mikefulb
super member
Reged: 04/17/06
Posts: 167
Loc: Central NC
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Thank you for this information. I had made the mask in Photoshop and I didn't realize there was an offset. Is there a mathematical expression to determine the offset of the central line from the tip of the triangle?
I'll try scaling one of your bitmaps and using it as a comparison with my current mask.
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Michael Fulbright
http://msfastro.net
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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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Woohoo!!! Jerry was able to make contact with Pavel and we've received permission to include his name on our site. I've added text describing the history of the mask. Again, I apologize to Pavel and everyone else here for not having this ready on day 1.
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John Wunderlin
Vendor - Spike-a Bahtinov Focusing Mask
Empire Ranch Observatory
Iowa County Astronomers
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