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Old 21-10-2009, 12:12 PM
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mental4astro (Alexander)
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mental4astro is offline
 
Join Date: Jun 2008
Location: sydney, australia
Posts: 5,005
Hi Manav.

If you use this type of EP & not use a coma corrector you will just be cheating yourself of the best the eyepiece can offer. You may as well limit your EP selection to a max FOV of 68/70 degrees as this tends to be the limit that unassisted good eyepieces can offer sharp to edge of field. Remember, we are talking of the inherent optical properties of fast reflectors and different eyepiece designs. These are not defects of manufacture. Its like using standard petrol in a dragster instead of nitrous oxide- it will go, but you will always lose every race.

The Paracorr is not the only coma corrector either. Baader Optical also makes one especially designed for f/ratio 3.5 to 5, their 'Multi Purpose Coma Corrector'. There are others available.
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