I find Barlow lenses very useful in achieving better image scale in planetary imaging (through afocal, prime focus, or eyepiece projection). Using a 2x Barlow lens, I can actually double the effective focal length of my setup. With a 2x Barlow, the effective focal length of my 900 mm telescope would then be equal to 900 mm X 2 = 1800 mm. During nights of steady seeing and I wish to further magnify an image, I use another 2x Barlow, thereby having an effective focal length of 900 mm X 2 X 2 = 3600 mm :)
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© Anthony Urbano (Manila, Philippines)