Now that is one nice looking Bahtinov Mask!!!
Bet that Adam


Posted 08 September 2008 - 08:00 PM
Now that is one nice looking Bahtinov Mask!!!
Posted 08 September 2008 - 08:08 PM
Now that is one nice looking Bahtinov Mask!!!
Bet that Adamit is 100% inspired on the first file you sent me
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Posted 08 September 2008 - 09:41 PM
Posted 08 September 2008 - 10:29 PM
A mate in Mexico, Pedro Gonzalez, created his Pavel mask for only $8USD, look
Posted 09 September 2008 - 09:37 AM
Posted 09 September 2008 - 02:30 PM
Posted 09 September 2008 - 03:33 PM
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?
Posted 09 September 2008 - 04:08 PM
As i know it was made of 3mm wooden MDF and then black paintedIs that made out of black foam board? If not, what is it made of?
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 costPerhaps you and your mate could open an export business. I know I would be interested.
Posted 09 September 2008 - 04:21 PM
Posted 09 September 2008 - 05:50 PM
Posted 09 September 2008 - 06:44 PM
Posted 09 September 2008 - 09:02 PM
Posted 09 September 2008 - 09:06 PM
Posted 09 September 2008 - 09:25 PM
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?
Posted 09 September 2008 - 11:23 PM
Posted 09 September 2008 - 11:29 PM
Posted 10 September 2008 - 12:36 PM
Posted 10 September 2008 - 12:46 PM
Posted 10 September 2008 - 01:03 PM
Posted 10 September 2008 - 03:36 PM
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?
Posted 10 September 2008 - 04:02 PM
Posted 10 September 2008 - 06:09 PM
hi i'm new to this forum and i followed this link from another forum. my questions for this mask are two
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)
Posted 10 September 2008 - 06:20 PM
Hello!
Thank you all for waiting. I must apologize in advance. I had made a mistake in the asking the size of aperture on each of your scopes. I actually needed the full front diameter of your scopes so the mask can sit in front without leaking light in through the sides. I suppose it isn’t that big of a deal but I also didn’t want to send you a useless size.
So I have included the scalable vector drawing that I made. This way you can simply scale it to the exact size you need with out waiting. You will need to download and install Inkscape if you haven’t already. Alternatively you can import the file in to any other editing software that supports svg files (scalable vector graphics) such as Corel Draw.
In addition I have included a new drawing I did that is more designed for refractors. The central obstruction is greatly reduced to allow more light through. Please let me know how it works out if you try it.
Once you have Inkscape installed simply open the svg file. Select the arrow tool in the upper left side and click on the mask. On the far right side of the measurement boxes near the top middle of the screen, change the ‘px’ selection to ‘mm’ – this is your measurement unit. Next, in the right two measurement boxes, enter in the diameter of your scope opening. Enter the same number for both boxes so your mask is a perfect circle.
Click on “File†and export your resized mask as a bitmap. This will allow you to more easily print out your new pattern from your preferred printing program. Here is a screen shot with the items I just mentioned circled.
That should get you a nice new mask to try out. Whether you print it out on paper and cut it out or you have one cut for you, please let me know how it works out for you! Please let me know if you have any questions!
Cheers!
Posted 10 September 2008 - 06:37 PM
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