OP­TICS

Sky at Night Magazine - - FIRST LIGHT -

The front lens is 4 inches in di­am­e­ter and has a fo­cal length of 660mm, which gives a fo­cal ra­tio of f/6.5. All the op­ti­cal sur­faces are

coated with Ce­le­stron’s XLT coat­ing for max­i­mum trans­mis­sion of light and give crisp views of the brighter

deep-sky ob­jects.

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