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| Does Bahtinov Mask work with Mirror Lens/Scope? |
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Do you mean a Newtonian, if so yes. It also works with an SCT. It also works with a lens if you can find a Bahtinov mask the right size. Carole |
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Carastro: For example—what about a lens like this? It'll be a little while before I get my WO scope—so I'll be experimenting with what I currently have and was curious if the mask would help. Thanks! |
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It will work also with this. But might be you have to make the mask by yourself, so you won't find a fittig one. CS Hartmuth |
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yes, using a Bahtinov mask for a refractor or reflector will work. I use one for my 235 mm SCT and 200m RASA and one for my 80mm guide scope. The mask creates a diffraction pattern that allows you to obtain, a perfect focus. The other way, is to invest in a digital focuser, where the software will achieve precise focus, using a mathematical model by moving the focus in and out, creating a 'V' shape graph using the HFR or FWHM of stars. The bottom of the 'V' is the precise focus, or the lowest HFR star value for a given focus value. For example, with my RASA and 1600 mm camera, my focus is around 10,200 to 10,500 value depending on the viewing conditions. If I use another set up, say, with my other CCD camera, the focus value will be totally different, 7500 -8500. Remember, on your first night of light, with your new equipment, you may not see a single star. <<You may ask yourself, what is going on with my camera>>. If your scope is totally defocused and you are using a filter, you may not see anything, but don't panic, just play with the focus knob. Or, you may see large round objects, those are huge de-focused stars. Again, focus in or out to bring the stars back to pin-point objects. Then, proceed with using the bahtinov mask. If you use the mask right away, you may have a hard time 'seeing' the stars. Clear skies and good luck |
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Rich Sky: Thanks, as always, Rich! |
