Re: Usable Eye Relief Difference between Explor Sci 68* 28mm and 82* 30mm?
I've got the 82° 30mm, but I've not tried it with glasses on (I wear contact lenses when observing). Eye relief is quite sufficient in that regard, but that doesn't help your decision process.
I will suggest, however, that this eyepiece may offer a very large exit pupil (about 6mm) with that particular scope, and this may cause the central obstruction (secondary mirror) to display a darker splotch (shadow) in the center of the FOV, especially on brighter objects.
I get a similar effect in my 12" f/5 dob. It puts up a 6.02mm exit pupil with my scope and I do notice the loss of light with this eyepiece. As a result, this eyepiece doesn't spend a lot of time in my dob. It is absolutely amazing in my 127mm refractor.
I find that the 82º 24mm is much better in the capacity as a "finder" eyepiece as it loses less light than the 30mm. It puts up an excellent and bright image with my dob.
Again, though, that doesn't help you with your eye relief question, but will hopefully pose another aspect of your decision that you may not have considered. You may not be concerned about that at all, but just wanted you to be aware that it could pose an issue for you.
Bryan
To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
:
To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
f/5; Celestron C6-R f/8; ES AR127 f/6.4; ES AR127 f/9.4; Stellarvue SV102T f/7; ES AR102 f/9.8;
To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
MC90 f/13.3;
To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
ST80A f/5; Celestron Premium 80 f/11.4; Celestron C80 f/11.4; Unitron Model 142 f/16; Meade NG60 f/10
Mounts: Celestron AVX; Bresser EXOS-2; ES Twilight I; ES Twilight II; iOptron Cube-G; AZ3/wood tripod; Vixen
To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
Eyepieces: GSO Super Plössl 40mm, 32mm, 15mm, 9mm; ES 82° Series; GSO Superview 30mm; Celestron Plössl 26mm, 20mm; ES 70° 25mm; ES Plössl 25mm; Vite Aspheric 23mm, 10mm, 4mm; Orion Expanse 20mm, 9mm; KK Ortho 18mm, 12.5mm; Bresser 70° 15mm; Coulter Optical 12.5mm; BCO 10mm; ES 62° 9mm; Zhumell Z Series 5mm
Binoculars: Pentax PCF WP II 10×50, Bresser Corvette 10×50, Bresser Hunter 16×50 and 8×40, Garrett
To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
12×60 LW, Gordon 10×50, Apogee 20×100
To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
To view links or images in signatures your post count must be 5 or greater. You currently have 0 signatures.
Galaxy Hunter's Creed - When you play whack-a-mole, sometimes you hit 'em on the head, sometimes you miss 'em. But its always fun to play, and if you don't play, you ain't gettin no moles! - KT4HX