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Searching For A New Eyepiece


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1 hour ago, great_bear said:

The TMB Paragon 40mm has become a bit of a classic (also known as the Sky Watcher Aero ED40) - and not particularly expensive either.

Unfortunately it's getting harder to find these days. I have one, and it's a keeper; I'm never selling mine (and I'm ridiculously fussy when it comes to eyepieces).

https://www.harrisontelescopes.co.uk/acatalog/skywatcher-aero-40mm-ed-eyepiece-2.html (out of stock, regrettably).

Will keep my eyes open for one.

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22 hours ago, great_bear said:

It would either have been in the Mak 180 Pro (F15) or the standard SkyWatcher 130P (F5) - I can't remember which.

Well, a 650mm focal length has a strongly curved focal plane, so it was likely in that scope.  The Mak's 2700mm focal length wouldn't have had such a curve.

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20 minutes ago, Don Pensack said:

Well, a 650mm focal length has a strongly curved focal plane, so it was likely in that scope. 

Would it also make sense that I see no such curvature in the eyepiece that I settled on instead, the Meade 24 SWA?

Meade  24mm Series 5000 1.25

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3 hours ago, great_bear said:

Would it also make sense that I see no such curvature in the eyepiece that I settled on instead, the Meade 24 SWA?

Meade  24mm Series 5000 1.25

No, the 24mm SWA/ES68 does have a bit of field curvature. What it has less of than the 24 Pan is rectilinear distortion. 

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32 minutes ago, great_bear said:

Hmmm… Could I be thinking of the Pentax XW that I used to have?

The 14mm and 20mm versions have some FC, along with the 40mm.

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13 hours ago, great_bear said:

Would it also make sense that I see no such curvature in the eyepiece that I settled on instead, the Meade 24 SWA?

Meade  24mm Series 5000 1.25

) + ) = | or curved field scope + curved field eyepiece = flat field image.

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