# 17 Mar, 2020 18:20
|Does Bahtinov Mask work with Mirror Lens/Scope?|
# 17 Mar, 2020 19:27
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.
# 17 Mar, 2020 19:32
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.
# 17 Mar, 2020 21:38
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.
# 18 Mar, 2020 12:11
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
# 18 Mar, 2020 14:28
Thanks, as always, Rich!
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