Quote:
Originally Posted by skysurfer
That depends on the physical aperture and FL has nothing to do with this.
From the Sun we get 1000W/m2 so a lens of given aperture will concentrate the same amount of energy, regardless of its diameter. So smoke will appear.
My 40cm Dob instantly ignites a newspaper when pointed at the Sun and no eyepiece in it.
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I'd expect a 40cm dob to just that!
Try forming a solar image with a 50mm aperture F50 lens and then a 50mm F1.0 lens and let me know how is goes
