A Plethora of Plossls
Posted 17 December 2009 - 08:32 PM
That 8mm Plossl from Telescope Warehouse is actually a Carton Plossl from Japan. I had a partial set fro awhile and really, really liked them, but for their non-standard threads. That $22 price at the Warehouse is a steal.
Posted 17 December 2009 - 09:52 PM
Posted 17 December 2009 - 11:01 PM
Posted 18 December 2009 - 12:39 AM
Posted 25 December 2009 - 11:25 AM
After using a few mismatched Plossls over the years I have in the last year or so gathered together some nice secondhand ones. The vintage Celestron set includes the 32mm, 26mm, 17mm, 12.5mm, 10mm, 7.5mm, and 6.3mm; the entire set except the 40mm which I probably won't buy. These are sometimes called the "Halloween" Plossls by Celestron. They were included in the April, 1996 Sky & Telescope review article. They are nice-looking Plossls except that the orange lettering was applied just to the surface and can come off if scraped hard enough. The 6.3mm has short eye relief but is usable. This entire matched set of used Plossls was very affordable to collect.
The TeleVue smoothside Plossls are really a step up in quality of construction and are just beautiful. I have a short set of these; the 26mm, 17mm, and 10.5mm. The 26mm and 17mm provide some nice low power views for my Ranger.
Posted 26 December 2009 - 08:16 PM
Posted 26 December 2009 - 10:55 PM
I've been wondering about the Orion Explorer II EPs. I have 2 (the 6mm and 17mm) which came with my Starblast dob. The Orion catalog describes them as "Plossls," but I guess they really can't be if they only contain 3 elements. Or is the term Plossl just used rather loosely nowadays, as I guess the Meade 5000s really can't be true Plossls either, since they contain 5 elements?
Posted 27 December 2009 - 03:00 PM
Posted 27 December 2009 - 03:21 PM
Posted 30 December 2012 - 10:25 AM
Posted 01 January 2013 - 09:06 AM
I agree with you, plossls can be a preferred alternative even with today's overkill wide angle, oversized choices available. I've never fully accepted advertising hype extolling the latest 6 to 9 lens creations.
Posted 11 January 2013 - 05:59 PM
So long as you stick to 50 degree fields, there is really no reason to go beyond Plössl eyepieces.
It's when you want 60 degrees....65....70....82.....90....100....110....120 degrees that it becomes really necessary to add additional lenses for correction of all the various aberrations.
It is possible to get a little better correction by adding a 5th element to the standard Plössl, but many of the current batch of 4-element ones are so well corrected and coated that it seems unnecessary. Plus, nearly all the 5-element ones have been from Japan, and labor costs are forcing them out of the market.
Were I not besotted by the huge fields of latter-day über-widefield eyepieces, I would gladly stick to Plössls and be happy.
Of course, you'd need a good barlow to create high powers. I think Plössls below 10mm of focal length require corneal implants [You think I'm joking? I've seem 4 and 5mm Plössls with eye relief shorter than the distance from my cornea to my eye's own lens!!]
Posted 11 January 2013 - 06:30 PM
I will be reading it over and over several times.