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Thread: ortho vs plossl

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    Default ortho vs plossl



    Greetings:

    I am getting ready to get another eyepiece to fill a gap in my collection (I'm looking at 12mm or so). I like simple eyepieces, so I will probably choose between a UO 12.5 ortho, or a plossl of a similar size.

    Could I please get your thoughts on ortho vs plossl in this size?
    Fly me to the moon, let me play among the stars -- Sinatra

    Older Discovery 12.5 solid tube dob, Orion 120mm refractor, non-go-to mount, eyepieces are 40mm and 32mm Orion Highlights, 25mm and 10mm Orion stock, 17mm Sterling, 12.5mm Baader, and 7.5mm Orion Ultrascopic, all housed in 8X10 Sky Shed

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    Default

    Either will do really, but the plossl will have a wider FOV than the ortho, good if your mount does not have tracking. I see that you have various brands of EP's, maybe you want to try other brands than what you have now? If so, then aside from the UO HD, look also into the Baader Genuine Orthos, Brandons or Edmund RKE's, they have good reviews.

    Best,

    Hernando

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    Actually, the UO othro was my first choice. One reason is that, as you have noticed, I like to try a variety of brands.
    Fly me to the moon, let me play among the stars -- Sinatra

    Older Discovery 12.5 solid tube dob, Orion 120mm refractor, non-go-to mount, eyepieces are 40mm and 32mm Orion Highlights, 25mm and 10mm Orion stock, 17mm Sterling, 12.5mm Baader, and 7.5mm Orion Ultrascopic, all housed in 8X10 Sky Shed

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    Default

    Just thought I'd share my experience. A couple weeks ago I put a 9mm Baader ortho up against a 10mm Sirius Plossl, a 10mm Radian and a barlowed 18mm UO (volcano top) ortho. The 9mm Baader was by far the best (showed detail more readily on Jupiter, less of a halo around the planet). The barlowed 18mm was a very close second and the 10mm Sirius plossl came in last behind the Radian (subtle features that were solid in the ortho's would come and go in the sirius plossl). The scope used was a 127mm MAK.

    So, if you're going for planets, it's hard to beat a well made ortho. However, the greater FOV of a plossl is nice for framing DSO's.

    Just thought I'd share my observation...
    Craig

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    Yeah, I really think it's going to be a Baader ortho, or maybe the UO HD. Thanks for sharing your experience.
    Fly me to the moon, let me play among the stars -- Sinatra

    Older Discovery 12.5 solid tube dob, Orion 120mm refractor, non-go-to mount, eyepieces are 40mm and 32mm Orion Highlights, 25mm and 10mm Orion stock, 17mm Sterling, 12.5mm Baader, and 7.5mm Orion Ultrascopic, all housed in 8X10 Sky Shed

 

 

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