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6 inch F/24 refractor ....... interesting mount too !


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17 minutes ago, Doc said:

Surely at F24 it's got to be approaching APO quality. I wouldn't even attempt to do the maths but I'm sure it's aroud that number.

I would think the CA even from a crown / flint achromat would be very, very well controlled at F/24. My 6 inch Istar did show noticable CA though so you have to go really long as the aperture increases.

 

CA-ratio-chart-achro.jpg

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I love long focus refractors an all, but that's just a step too far!...or should I say an f-stop too far (or 8 ) 

Still I admire that someone actually make this and mounted it on a cool car. Definitely no a beige decision.

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1 minute ago, JeremyS said:

No it wasn't me. Couldn't figure out how to get the tin opener engaged with the Volvo's roof.

Wait a momement - my wife's Toyota Yaris has a sunroof ! :grin:

 

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