Teeter STS 11 f/4.3 Zambuto | XT8i | XT8g | XLT 150 | C90 | EON 80mmAT Voyager and Nexstar SLT mountsEyepieces: Mostly TeleVue and PentaxDenk II BV'er, Earthwin PFS-SE, Pentax 10x50 PCF WP II
16" AstroSky F4.5 C/W Skycommander, TEC 140, 6" F8 Edmund, 120 Skywatcher F5 SW EQ6 AP SPL 5mm Carl Zeiss Jena .965 6,10,12.5,16,25, Pentax 3.8mm XP, 7mm SMC, 7XW, 10XW TMB SMC 8mm,TMB Planetary 2.5,6, TV Smoothie NJ's Plossls, 14 Delos, Nagler 20T2, WO 4,28 UWAN, Orion Zoom 7.5-22.5, BGO 9 Binoculars Pentax PCF 7x50, SPACE, "A PORTRAIT OF PERFECTION!" Tony M
Quote:Starman81 great info the look of these kept me away along with no reviews of them.Dosn't sound to great of an EP As for the ES 100 they are very nice i tried the 9,14,20Have you been drawn to the WO WWA?Would love to hear more info on themI applaud you for trying this one out
Quote:Syed,The first Naglers had an issue with their exit pupils--the outer portion of the exit pupil required the eye to be positioned closer to the eyepiece than the center. What that meant is that when you got close enough the the eyepiece to see the outer portions of the field, you were a trace too close in the center. This resulted in blackouts only in the center 2/3 of the field, and because your eye inevitably wandered a bit, these "kidney-bean" shaped black-out areas tended to wander around the field (though not at the edge).This got the name of "Spherical Aberration of the Exit Pupil", or SAEP.Most other eyepieces don't have, and haven't had, this, but those that have have not received kind remarks in reviews.Fortunately, the early Naglers were terrific in so many other regards, people tended to overlook this issue.Now, the issue to which you refer (and it is in a lot of other ultrawide eyepieces) is not merely a chromatic aspect of SAEP, though it could be, but probably related to the nature of the anti-reflection lens coatings used on the lenses. Like any group of transparent coatings, the spectrum of transmission depends on the angles that light makes as it passes through the lens. The very outer edges of most eyepieces seem blue or green or yellow because of this factor. It's usually found only at the very edge, though, maybe the last 0.1-0.2 degrees of apparent field. When it's farther in it can mean the curves on the lenses are really severe. In a way, it's a form of lateral chromatic aberration, though it's very different than what is normally called that.It doesn't show at night unless looking at the Moon or letting a planet pass into the very edge zone. But it does make the eyepiece less than ideal for daytime use.
10" F/4.7 Modified Skywatcher Reflector, 38mm Orion Q70, 17mm Modified Ultima LX, 10mm TeleVue Delos, 7mm Pentax XL.
Meade 12.5" F/6 Research Grade
1971 Criterion RV-6
Orion Observer 70mm Refractor
Homemade 4" f/12 reflector (being rebuilt)
Blog: Astronomy & Living by Hernando
Vixen 140mm Neo-achro, 2" AP Maxbright diagonal, 40mm Orion Optilux, 35mm, 30mm, 18mm, and 15mm Ultrascopic/Ultima, 28mm & 20mm ES 68, 19mm TV Panoptic, 5.5mm Meade UWA, 2.4x 2" Dakin barlow (prototype barrel),1.6x Antares barlow.
AP 15x70,Garrett Signature 10x50,Nikon SE 10x42,Celestron Regal LX 8x42,Bushnell Custom Compact 7x26,Pentax Papilio 6.5x21, Grip-Action Monopod, crank elevator tripod.
Orion Starblast 6,Meade 5k SWA 24mm,20mm and 16mm,Antares Speers Waler Series2 9.4mm, 7.2mm and 4.9mm.Meade 5k 2x TeleXtender.
Quote:Maybe you can do what I did and rip off that ugly rubber grip !!! Cheers,
Quote:Syed,Nice review on the Meade "Pineapple" (and pics too), never thought I'd see one, thanks!