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  1. #11
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    Quote Originally Posted by WWPierre View Post
    Well, if you know me at all, you know that I get as much enjoyment, (perhaps more, if I am to be brutally honest), out of tinkering and tuning as I do observing. My thought was that if I can make a light proof collar for a bahtinov mask, I can make one for a solar filter.
    Yeah, I noticed that But how do you know how you'll use it? Will you want to use it all the time, popping it on and off with some kind of quick release, or will you just use it the once at the start of the session?

    And by the way, will this mask work WITH a solar filter? Might be worth factoring that into your design too

  2. #12
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    The brown paper tape that you mentioned in your first post. Isn't it the same tape that picture framers use to seal the back of the picture to stop critters getting in?
    How insignificant we are in the scheme of things.
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  4. #13
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    Quote Originally Posted by psonice View Post
    Yeah, I noticed that But how do you know how you'll use it? Will you want to use it all the time, popping it on and off with some kind of quick release, or will you just use it the once at the start of the session?

    And by the way, will this mask work WITH a solar filter? Might be worth factoring that into your design too
    I think you misunderstand. The construction of a slip-fit ring became the prime objective. The focus mask is what led me to the concept of papier mache.

    The drywall tape is not the best material, as I have learned. It is, in fact, tapered, so that it is thicker in the middle, and folding it on itself doubled the "error" It didn't turn out as neat as I had hoped. (see pic below) I am thinking that seamstress's bias tape might work better.

    I never intended that the solar filter would be incorporated into the focus mask. My dust cap, for instance, keeps falling off, so, once I have perfected the technique of producing nice, neat, slip-fit ring for my OTA, I will make three; one for a focus mask, one for a solar filter, and one for a new dust cap.
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  5. #14
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    Quote Originally Posted by Ray130eq View Post
    The brown paper tape that you mentioned in your first post. Isn't it the same tape that picture framers use to seal the back of the picture to stop critters getting in?
    Yup, thanks for the possible source of supply.
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    49-41-37.03N 123-09-29.61W Calculated magnetic declination: 17° 39' East

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  6. #15
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    Declan--

    The quality of focus possible is truly amazing and VERY easy to achieve. And, yes, as soon as you obtain focus, you take the "mask" off.

    I bought mine because I wanted to immediately eliminate a variable in my learning curve. If I had the experience WWPierre has, I think I would have tried to make it.

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    title="Astrophotography">Astrophotography/Astrophotography.htm">seal killer's Astrophotography</a>

  7. #16
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    Pierre, what I'm getting at is: a slip ring is all well and good, but if you use this a lot during observing slipping it on + off all the time and keeping it somewhere safe isn't ideal. Perhaps slip ring + a hinged mask (so it can be dropped down to hang in front of the scope when not in use) or something like that. My thinking here is that for myself, I change EPs all the time while exploring and refocus each time.

    Plus, if you can use this for focussing while doing solar observing you'll want to fit both the solar filter AND the mask, with an easy way to detach the mask.

    For the tape: would wide masking tape work at all? I use that when I'm decorating, you can get decent stuff that's about 2" wide. It's like the paper taper you get on picture frames but waxed, perhaps a bit smoother to get on + off?

  8. #17
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    Quote Originally Posted by seal killer View Post
    And, yes, as soon as you obtain focus, you take the "mask" off.
    Yes, take it off, but keep it handy. Your focus point may change through the night as the temperature changes. When imaging, I usually find myself adjusting the focus using the mask at least once during the night (usually between 10pm - 12am, when there's the big temp drop after sunset). So while you can take it off, keep it nearby in case you need to re-focus (which is very common for multi-hour imaging).

    As psonice said, I create a hinge with the duct tape holding the mask in place on one side. I just pull the mask back and tape it to the OTA in case I need it again (I don't let it just hang off the OTA because it might catch the wind and introduce vibrations).
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  9. #18
    psonice's Avatar
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    I think it's well worth pointing out how easy this is to try out too. You just need to use the generator in the link Pierre gives in his first post, print it out (ordinary paper will do! Just glue the paper to some thicker card, a cereal box would do fine even), cut out the shapes with sharp knife/scissors and use a bit of sticky tape to fix it to the front of your scope.

  10. #19
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    My thinking here is that for myself, I change EPs all the time while exploring and refocus each time.
    Ah, this is where the mis-understanding enters. This is only for astrophotography. It is well-nigh impossible to focus the camera through the scope because of the terribly lo-res image you can see through the viewfinder.

    For the tape: would wide masking tape work at all? I use that when I'm decorating, you can get decent stuff that's about 2" wide. It's like the paper taper you get on picture frames but waxed, perhaps a bit smoother to get on + off?
    The reason for the papier mache is that I wanted a stiff product, and something I could easily glue to. Masking tape has neither of these properties. Even carpenter's glue retains some flexibility after setting. (That's what makes it so good for wood, it gives a bit with the movement of the wood.) Once this prototype dries (sets) completely, I can evaluate it for stiffness, and if it needs to be stiffer, I can use urea formaldehyde glue, which sets harder.
    Last edited by WWPierre; 07-21-2010 at 11:22 PM.
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  11. #20
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    1. The Bahtinov mask works fine if it's not light tight. I made mine out of cardboard, use a couple pieces velcro to hang it from the dew shield, flip it up in place to use, and _hopefully_ remember to remove it before starting imaging !!

    2. It works on points of light. It won't work well on close double stars, the Moon, or the Sun, because the image isn't a point. Your mileage may vary, but mine seems to work best on bright bluewhite stars. My avatar is a slightly saturated view of Vega in my homemade mask.

    3. It's good for visual use too; it's good to keep it handy, I don't even remove it completely I just hang it from its velcro when not in use.

    4. Find a bright star near your imaging target; use the mask to focus; lock everything down, remember to remove the mask, find your target and fire for effect. I use the CGEM's "precise goto" function and focus on the star it sets up on, then when it slews to the target I'm set.

    5. Good luck on the light-tight seal project. I've got access to a machine shop so the only thing I can think of involves machine tools and engineering plastics like Delrin.

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