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GSO 1.25" Plossl Eyepiece - 9mm

4.8 (9 Reviews) Read Reviews Write Review
Brand GSO
Part Number GSP09
Availability available

Product Info

Manufacturer Description

GSO's Super-Plossl eyepieces have been some of our most popular sellers over the years. Users will experience incredible views without breaking the bank or impinging on your telescope's balance. They represent what is perhaps the best buy today for astronomers on a budget or for beginners. But don't be fooled by their low prices - these might well turn out to be all the eyepieces you will ever need!

The GSO Super-Plossls are available in a 1.25" barrel size and 9 different focal lengths ranging from 4mm to 40mm. The 4mm, 6mm and 9mm models are great for high power planetary and lunar observation.  The 12mm and 15mm are perfect intermediate focal lengths, performing well on both deep-sky and planetary subjects.  The 20mm and 25mm models would be excellent choices for low power scanning of open star clusters and viewing larger galaxies. The 32mm and 40mm models offer a wide field and are superb for wide field scanning, detailed observations of large diffuse subjects or as a finder eyepiece.

Features:
- All eyepieces are fully multicoated (FMC) for maximum light transmission
- High quality lenses provide the best-possible sharpness all over the field of view
- Blackened lens edges reduce light scattering and improve contrast
- Fold-down rubber eyecups to keep out stray light
- Comfortable eye relief at all but the shortest focal lengths (As in all Plossl eyepieces, eye relief can get tight at the shorter focal lengths but this is design constraint, not a fault of these eyepieces)
- Includes two end caps

Reviews

4.8 (Based on 9 Reviews) 89% of reviewers recommended this product.
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    1. Pleiades

      Pleiades Well-Known Member

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      Review by A.W.
      1534854626
      Aug 21, 2018

      5.0 Nice Hi-Power EP

      Pros:

      Cons:

      Comments:

      When I use a Hi-Power EP, this is the one that is most often employed. At 6mm, of eye relief, this is about my limit before I need to invest a bit more money for my comfort. It provides, very crisp views and great color with no fringing that I have noticed. For the price, I can live with the 6mm of eye relief. It preforms great on slower scopes. I use mine on an f/8, and have been exceptionally pleased.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    2. Guest

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      Review by Allan of Manila.
      1475625600
      Oct 4, 2016

      5.0 This is the best you can get for the price.

      Pros:

      Compact,Strong Construction,Accurate,Quality Lenses,Easy to Use,Lightweight

      Cons:

      Comments:

      At this price point, you can't go wrong. The optics are pretty good and have no problems so far in about a year of use. Its reasonably comfortable and easy to use. I bought the 6mm and the 9mm, as I already own the 32mm and 40mm. Unless your using the highest quality and the most expensive gear, this is the brand to get.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    3. Guest

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      Review by JDC of Southern California.
      1354406400
      Dec 1, 2012

      5.0 Quality and bargain

      Pros:

      Bargain,Sharp Picture,Quality

      Cons:

      Comments:

      Great bang for the buck. I use this mostly for viewing the planets and the moon with my 8 inch Dob. The moon looks very clear and sharp and still looks sharp with the 2x Barlow. So far I've only been able to see Jupiter but I was able to clearly make out cloud bands and the Galilean Moons. Can't wait to see Saturn. Highly recommended if you don't want to spend big money

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    4. Guest

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      Review by PH of Brazil.
      1354320000
      Nov 30, 2012

      4.0 Affordable replacement

      Pros:

      Fully Black Coated Inside,Quality Lenses,Strong Construction

      Cons:

      Comments:

      Affordable replacement of a standard 9 mm eyepiece that normally are supplied with telescopes. Those are cheaper, but have a plastic body, which can cause some reflection inside. This GSO has a metal body, fully black coated inside.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    5. Guest

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      Review by Sir Doctor Ninja Garrett III, Esquire of Suburbs outside LA.
      1341273600
      Jul 2, 2012

      5.0 Great results for the cost

      Pros:

      Lightweight,Easy to Use,Compact,Accurate,Quality Lenses

      Cons:

      Comments:

      I live a few miles outside Los Angeles in the suburbs and even with all of our light pollution, and actual pollution, I'm still able to get great views with this eyepieces. While somewhat limited by the sky conditions, I can still make out the Cassini division and some banding on Saturn through my Orion xt8. DSO's are definitely a possibility too once I get to some darker skies.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    6. Guest

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      Review by GarthN of Cape Town.
      1320019200
      Oct 30, 2011

      5.0 As good as hoped for

      Pros:

      Quality Lenses

      Cons:

      Comments:

      Arrived quicker than expected, for the price a great eyepiece - value for money.

      Bottom Line: Would you recommend this item? No
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    7. rmscott59

      rmscott59 New Member

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      Review by rmscott59 of San Francisco, CA.
      1273881600
      May 14, 2010

      5.0 A REAL WORKHORSE!

      Pros:

      Strong Construction,Accurate,Quality Lenses,Compact

      Cons:

      Comments:

      All the qualities you want in an eyepiece without breaking the bank! Sturdy construction, quality feel, adequate coatings, very crisp images, very acceptable sharpness at edges. A super Plossl at an affordable price....just what you expect from GSO.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    8. Guest

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      Review by Ben57 of France.
      1272758400
      May 1, 2010

      4.0 Very good quality for price

      Pros:

      Accurate,Quality Lenses,Strong Construction

      Cons:

      Comments:

      Use it with a C8 SCT. Received it from AgenaAstro in a nice case.

      Maybe not the best EP on the market, but by far the best quality at this price level.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

    9. manowars

      manowars New Member

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      Review by manowars of Brazil.
      1243036800
      May 22, 2009

      5.0 Excellent value for the price

      Pros:

      Crisp images,Quality

      Cons:

      None at the moment

      Comments:

      This eyepiece from GSO is very good, the images are formed very well, even in the borders. I use this eyepiece for great magnification with objects like M42, Pleiades, Jewel Box and other DSOs. I use it mostly for planets and nebulae viewing. The coatings are very good too. It has a good eye-relief, especially if you wear glasses.

      Bottom Line: Would you recommend this item? Yes
      Was this review helpful? Yes / No

      This review was provided courtesy of AgenaAstro.com

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      Specifications

      Apparent Field of View 52°
      Barrel Size 1.25" (31.7mm)
      Bolt Case Included Yes - Free Agena Eyepiece Container
      Bolt Case Size Agena 42x60mm
      Coatings Fully Multi-Coated
      Design Plossl
      Height (with Eye Guard) 53mm
      End Caps 2
      Eye Relief by Design 6mm
      Filter Threads Standard 1.25" Filter Thread (M28.5 x 0.6)
      Focal Length 9mm
      Lens Elements 4
      Rubber Eye Guard Yes
      Blackened Lens Edges Yes
      Manufacturer GSO
      Eyepiece Focal Length 5.1mm - 10mm
      Eyepiece Field of View 51 - 60 degrees
      Eyepiece Series GSO Plossl
      Barrel Type Smooth sided
      Eyepiece Weight 1.70oz (48.19g)