Also just because they say they are, really cheap plossl won't have FMC. The plossl really need to have blackened internals or you're wasting money, then there are the coatings etc. which is 3 pairs and a lot lighter than adding the dup barlows, remember you're going to have balance all this stuff. The 25mm is not the best in the series but still rates well. 60 degree over 50 is very nice gain, better eye relief at higher mag than plossls. I was going to suggest the ED Starguider as well, go straight to and they're $75 a pop. See ries_for_the_hyperion_universal_zoo m_mark_iv.pdf Whilst this seems counter intuitive it is like this so the true field remains relatively constant (or close to it particularly between 16 and 8mm). The zoom has a varying apparent field and in the case of the Baader it varies from 48 deg at 24mm to 68 deg at 8mm. The 82 deg field of the Nagler is very nice though when binoviewed. (Looking for another 15mm Panoptic to give me a bino pair as I really like the 68 deg field). I have the Tele Vue click-stop 8-24mm zooms but I also have a pair of 24mm Panoptic, 19mm Panoptic and 16mm Nagler. The zoom is handy to determine what fixed focal length eyepiece would give the best magnification for a particular target. This is all you would ever need and all options would give 68 deg apparent field. Combined with a 2x Barlow you can then also have 10mm (20mm + Barlow) and 7.5mm (15mm + Barlow). A pair of 15mm Superview would be a very nice slightly higher power pair for the Moon. I would think a pair of 20mm Superview (68deg) would be a very nice low power pair with greater true field than a pair if 25mm Plossl. The clear aperture of the binoviewer is listed as 22mm. This to me indicates the binoviewer is 1x since 2x is typically needed to use with Newtonians. They also mention the unit may not come into focus with Newtonians. The description on the Celestron site mentions their binoviewer is suitable for telescopes with at least 3.5” back focus. For me personally only the Moon gives me that WOW factor in ‘stereo’ but that is plenty. Binoviewing is no doubt more expensive as you need two of each eyepiece but can be enjoyable. If you want to save your dollars and put toward two zooms then see if you can pick up a used pair of something on this forum or even a matching Celestron 25mm Plossl. This is a great combo for browsing the Moon between 3 days old to 10 days old, (anytime when it’s not full). The 15mm at 135x and 68 deg apparent field will give about 0.5 deg true field which is the diameter of the full lunar disk. Note the shorter focal length and wider apparent field will give you more of that WOW factor when viewing the moon and with the 15mm you get some magnification you need for planets if at 1x mode. You may be able to use two 20mm Superview (68deg) for same price but I’m not sure of their field stop diameter so you may get a little vignetting (depends on binoviewer) which may or may not be objectionable to you. You could also consider two new 15mm Superview (68deg) at Bintel for $59 each. Otherwise consider two new 25mm Plossl (50 deg) at Bintel for $49 each.ĭoes your binoviewer operate at 1x or 2x mode? With an SCT 1x is Ok. Perhaps someone else can help you with where to get this eyepiece. Have fun! Make sure the Moon is your first target at about 10 day old it is truely spectacular in a binoviewer! The Tele Vue Bino Vue for example has 27mm clear aperture and can accommodate a pair of 32mm Plossl or 24mm Panoptic. A 25mm Plossl will have approx 21mm FSD and if your binoviewer has only 20mm clear aperture you may notice ever so slight vignetting but I would not see this an issue. One thing that you should look for is to ensure the field stop diameter of the eyepiece is not larger than the clear aperture of the binoviewer or you may see vignetting. To get started see if you can purchase another 25mm EXACTLY the same as the one you have as these are cheap and will give you a great view in your SCT with the binoviewer. It is an expensive option as you need two. The Baader will work for you provided your IPD is not less than 55mm (diameter of Baader 8-24mm Mark IV). However I have heard of one brand in particular offering matched pairs but could never understand why unless there is such a huge variation in their stated focal length that they need to do this. I have never had an issue with eyepieces from different production batches as the ones I have were bought many years apart. I also use other fixed length Tele Vue and Brandon eyepieces. I use two Tele Vue 8-24mm Click Stop zooms (discontinued) with my Bino Vue and these work well.
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