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1.25" fov


Ally8446

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Eyepieces that have an apparent field of view  and focal length that is an below the blue line in this plot can be made as 1.25" eyepieces. It has to do with the field stop. The field stop increases with the focal length, and also with the apparent field of view of the eyepiece. When the field stop becomes too large for a 1.25" barrel, a bigger barrel is needed.

post-38669-0-54120600-1452021037.png

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I agree with Tubby Bear. The 24mm ES68 will max out the 1.25" barrel while the 14mm ES82 will not, you'd need an 18mm 82° eyepiece to do that. However, the 24mm ES68 in the 8" skyliner will give a field of view of 24*68/1200 = 1.36° which you may not consider much of an improvement over your 25mm Starguider which will give 25*60/1200 = 1.25°.

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The 13mm 100 degree Ethos is a 1.25" eyepiece :grin:

For your budget and with a 24mm preferred focal length I think the Explore Scientific 24mm 68 would do very well and be showing pretty much as much sky as a 1.25" eyepiece can.

 

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I use a couple of 20mm 84 degree apparent FOV 1.25" fit eyepieces in our 300mm binocular telescope giving a power of 50x. The image quality much beyond 50% is nothing to shout about  but the immersive field and the good centre definition provide an impressive experience.   :icon_biggrin:

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Though these are from a US shop, I'm sure you can find them - under a different brand-name - over in your neck-of-the-woods. Thought you might like the information:

http://www.universityoptics.com/125inch.html#UAW82

I have 80° ones.They are very good and work well in quite a few different optical-systems (telescopes).

Dave

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