So, I have received many requests for the scalable vector graphic drawing I did for the Bahtinov Mask. So I figured I would post the 'email' I was sending everyone and include the actual files here so anyone can download and use them. Please do not use my drawings to produce masks to sell. These drawings are provided to the community as open source and should always be treated as such.

Quote:

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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!

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This is the scalable vector graphic for the SCT Bahtinov Mask.

SCT Bahtinov Mask Vector File

This is the scalable vector graphic for the Refractor Bahtinov Mask.

Refractor Bahtinov Mask Vector File

Here is the screen shot mentioned above to show where the InkScape commands/buttons/options are.

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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