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Merci Seb
9mm T6 is a good idea, but i'm leaning towards the T6 7mm because i want the most practicle magnification i can get...

Is it a bad idea?

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I don't have the 7mm T6 but my 5mm T6 is my most used planetary eyepiece in my 8" Dob. It gives me a good clean image and lots of field of view so I don't have to move the Dob so much. But there are lower priced alternatives that I like. SmartAstronomy's 6mm planetary is very nice the Vixen NLV Lanthanum's are very nice. Vixen makes a 6mm in that series but not a 7mm. You can get a 7mm Ortho but I don't like using them in Dobs because of the narrow field of view and lack of sharpness at the edges. (The NLV's also have a narrow field of view but they are much sharper at the edge in this focal range and the large top glass and generous eye relief makes it easier to see the whole field at one time, so they do work easier in Dobs.)

Hope this helps.

David E

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David E

So when at times the mob is swayed
To carry praise or blame too far,
We may choose something like a star
To stay our minds on and be staid.

-Robert Frost

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