Quality of Sirius Plossl Eyepieces?

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  • Member since
    May, 2005
Quality of Sirius Plossl Eyepieces?
Posted by Anonymous on Monday, November 12, 2007 8:19 PM

I see a lot of talk about eye pieces and find that Sirius Plossl EPs are not mentioned much (I have not searched then entire DB).  I am curious if these EPs are inferior in some way?  There is a nice "Expansion Set" in the Orion catalog that would add 20mm, 12.5mm, and 7.5mm EPs to my 25mm and 10mm at a price that is very reasonable for me.  I would love to hear thoughts on these optics and any arguments that can be made to persuade (or dissuade) me from making this purchase.  Thanks for your time!

 

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    October, 2007
Posted by zachsdad on Tuesday, November 13, 2007 8:33 AM
There's nothing wrong with plossl ep's.  They offer crisp, clear views, with good contrast and definition.  The drawbacks they have are short eye relief on short focal length ep's, and a more limited apparent field-of-view than than some of the other styles of eyepiece (usually about 52dg).  I have several plossl's, including a couple of the Orion Sirius, that I use frequently and am very happy with.  It's all a matter of personal taste and budget.

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    June, 2006
Posted by tasco-60mm on Tuesday, November 13, 2007 8:41 AM
mediocre
worlds worst photographer neanderthal computer skills cant stand directions http://my.funtrivia.com/private/main.cfm?tid=59481
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Posted by DaveMitsky on Tuesday, November 13, 2007 9:55 AM

The fully coated but not multicoated Sirius Ploessls are acceptable, if not outstanding, eyepieces.  The Tele Vue Ploessls are clearly superior as are Masuyama based five lens element designs such as the Orion Ultrascopics and the Celestron Ultimas.

As with all Ploessls, an to a somewhat lesser extent with orthoscopics, eye relief becomes quite tight in the shorter focal lengths.  Barlowing a longer focal length may prove a lot more comfortable. 

Here's a review that included the 17 and 20mm Sirius oculars. 

The Burgess Optical/TMB Planetary Eyepieces are very good buys if you're looking for short focal length eyepieces with long eye relief.

Dave Mitsky

Sic itur ad astra!

Chance favors the prepared mind.

A man is a small thing, and the night is very large and full of wonders.

  • Member since
    November, 2007
Posted by astronig on Tuesday, November 13, 2007 10:29 AM
They are NOT mediocre!....Its hard to beat a good Plossl!!!These are great eye pieces!...I personally don't own any Orion Sirius myself but I've got $300.00 eyepieces that  are really hard to see any improvement over the Plossl needing a well trained eye!...In fact,absolute light transmission in good Plossls beats most other designs!..........They have been tested and it's proof!...A nice selection of Plossls is way more versitile and enjoyable than one $300.00 Premium eyepiece!!!!.............And that's the truth!....................................Dave
  • Member since
    May, 2005
Posted by Anonymous on Wednesday, November 14, 2007 3:39 AM

I love how tastefully opinionated everyone on these forums is!  My XT8 arrived at 09:30 yesterday morning via Fed Ex standard shipping from Orion in Watsonville.  What remarkable service since I only ordered it at noon the day before.  Included with it are two Sirius Plossl EPs.  I think I will get a feel for these two before comitting to buy others.  There is also a star party at our local observatory this Saturday.  Perhaps I will have the opportunity to observe through some additional EPs and have a broader experience from which to make a decision. 

I left work at 00:30 this morning and there was not a cloud in the sky.  I could see the Big Dipper, Orion, and all the stars in between.  After the half-hour commute, the sky had clouded up so bad that I will have to wait until tomorrow to try out my new scope.  RATS!  (And a few other carefully omitted expletivesCensored [censored])

  • Member since
    June, 2006
Posted by tasco-60mm on Thursday, November 15, 2007 5:43 PM
i had the sirius, parks gold (ultima), tasco MA, GSO, and a standard skywatcher model (whatever it was) 10mm's in my possession at one time, i used a 9.25 and compared them at 235X over a couple nights- strictly planeatary) looking for contrast and resolution- the parks gold was easily the top performer, believe it or not, the MA was my second choice, i had a few other 10mm plossls over the years, i still have my 10mm parks gold, but cant forget the impressive views i got from that cheap $20 MA- plossls changed over the years from place or origin and price basically- but fully multi broadband coated still remains the best choice for a 4 element plossl, i think i gave the sirius away or sold it on astromart--maybe i had a bad one??
worlds worst photographer neanderthal computer skills cant stand directions http://my.funtrivia.com/private/main.cfm?tid=59481

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