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    AbbN's Avatar
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    Default Wide Angle Lenses



    Hi,

    Ok, I confess there's something I don't understand about WA lenses. For example, if I look through one of my scopes with a standard 5mm lens at (e.g.) Jupiter and then at it with a 5mm WA or SWA lens, would it be the same magnification with both lenses - would Jupiter be the same size????

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    Default

    Yes. But the actual FOV would be larger. With a 100x a 40 degree plossl would have a 0.4 degree (40/100) actual FOV. A 70 degree super plossl would have a 0.7 degree (70/100) actual FOV.

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    Default

    The planet would be the same size but the field of view would be wider ..Kind of like looking through one of your hands making a circle with your index finger and thumb versus a circle made with both of your hands using both index fingers and both thumbs ...Sames size but bigger pic. That is why plossl EP's are great for planetry stuff ..And wide angle EPS are great for DSO stuff.
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