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Thread: Pentax SMC O-6mm, FUJIYAMA HD–OR 5mm, Baader Classic Ortho 6mm, in terrestrial test

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    Default Pentax SMC O-6mm, FUJIYAMA HD–OR 5mm, Baader Classic Ortho 6mm, in terrestrial test



    Hello all,

    Cloudy skies, rains stopped, hardly any wind, and a clear air without turbulence,
    all together a good reason to test these three eyepieces including the new-to-me Pentax SMC O-6mm on the houses about 1,600 meters away down in the valley.

    As expected, all these three Abbe orthos have resolved details down to about 3mm on the bright white background of the house wall.
    Herewith the resolution close to the Dave’s limit (0.77 arcseconds) of the 6” F/5 achromatic Sky-Watcher (Synta) has been achieved.

    As the price difference between the discontinued Pentax SMC orthos and the FUJIYAMA HD orthos has increased to the 4:1, I have been curious if there is any visible difference between the both eyepieces when mounted on the fast achromatic refractor, and of course, how the budget BCO will compare.
    Regarding the FUJIYAMA, I am aware that with its shorter f=5mm there will be a difference to the other both 6mm eyepieces.

    First impression when holding the eyepieces just in my hand
    Pentax and FUJIYAMA reveal a sharp field stop.
    Pentax has a very thin and faint yellow fringe around the field stop, FUJIYAMA shows no fringe.
    The BCO has no field stop.
    The interior away from the field stop is darkest in Pentax, followed by BCO, and surprisingly less dark in FUJIYAMA.

    Observing comfort when the eyepieces are mounted
    Both the Pentax and the BCO offer a good observing comfort, the shorter FUJIYAMA is a bit tight for the distance to my eye, and not very forgiving when the axis of my eye is tilted.

    Chromatic aberration
    Masking down the aperture from the nominal 150mm to the mask opening of 110mm kills the spherochromatism,
    leaving the secondary spectrum CA deviations, and the lateral chromatic aberration, unskewed due to the suppressed spherical aberration.

    As the objects viewed have not been particularly bright to blow up the on-axis secondary spectrum CA, the lateral chromatism off the center field has been due to be checked .
    Pentax has revealed hardly any lateral color fringing, unless one tries to ruin the eyesight in search of the color fringes.
    FUJIYAMA has revealed some blue/orange hues in the field periphery, and the BCO even more.

    Just to be sure how these three eyepieces are doing with the classic on-axis secondary spectrum CA, (that’s what the people are talking about with raised voice), I have checked the focuser readings when putting the blue B223g Zeiss filter, and a no name red filter on the eyelens of the eyepiece.
    The readings difference on the focuser to the no filter placed, has been for all three orthos close to 0.18mm, which is better than expected. The expected C-e-F difference of the canonical achromatic refractor (150mm F/5) in the focus plane is 0.41mm, so the best focus at 0.18mm is slightly less than half way between green, and red/blue. This is on an achromatic refractor to be expected.
    Herewith, these three eyepieces are comparably well handling the on-axis CA of the refractors,
    adding no more troubles as some cheap eyepieces eventually do.

    Contrast
    The contrast of the views is something, what depends on how good a particular eyepiece optics is matched to the telescope optics.

    The best contrast has revealed the Pentax, followed by the BCO. With the FUJIYAMA it is not a fair comparison, as its shorter focus lengths blows up the magnification and results into the brightness and contrast loss.
    The contrast on the 3 eyepieces has further increased through the blue 470nm bandpass filter.
    This has been expected, as the shorter wavelengths of light increase also the resolution, and the blue color increases the visual contrast.

    Barlowing the orthos
    And finally, I took the Baader VIP Barlow (2x) to see what happens.
    All three eyepieces have had no problems, and they have blown up the smallest details to 250x (Pentax and BCO), and 300x (FUJIYAMA), and still with a remarkably good contrast.
    The Baader Q-Turret triplet Barlow has also worked good enough, but the expensive Pentax deserves the VIP, though.

    Parfocality
    The FUJIYAMA and BCO are within 2mm parfocal, the Pentax requires 8mm more focuser travel inside the telescope tube.
    With the Pentax mounted on the Baader VIP Barlow (2x) it may become a bit tough, as it requires 29mm travel inside the telescope tube. Still 7mm left on my GSO focuser with a shortened adapter to the telescope tube.

    More details on the Pentax SMC O- eyepieces, and some other tests can be found in
    https://www.cloudynights.com/article...mparison-r1865

    So, this has been my cloudy Sunday,

    JG
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    Default Re: Pentax SMC O-6mm, FUJIYAMA HD–OR 5mm, Baader Classic Ortho 6mm, in terrestrial te

    Thank you for this comparison, JG. I would love to find a set of the Pentax on the used market one day, of course at a good deal. I never realized the BCO didn't have a physical field stop. I suppose that attributes to the 52° AFOV, but how is the off axis sharpness in the outer filed of the BCO?
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    Default Re: Pentax SMC O-6mm, FUJIYAMA HD–OR 5mm, Baader Classic Ortho 6mm, in terrestrial te

    Quote Originally Posted by SpyderwerX View Post
    Thank you for this comparison, JG. I would love to find a set of the Pentax on the used market one day, of course at a good deal. I never realized the BCO didn't have a physical field stop. I suppose that attributes to the 52° AFOV, but how is the off axis sharpness in the outer filed of the BCO?
    Hello Frankie,

    the BCOs are (3 - 1) Abbe orthos, but with a changed glass materials prescription, when compared to the Baader Genuine orthos. Herewith they have blown the field up to 52°,
    and the short f=6mm has lost space to mount easily a field stop.
    For me is the field sharpness of the BCO 6mm on my fast achro still acceptable, but I am mostly observing the DSOs.

    I've got a small set of the open box with documents Pentax SMC O- from Intercon Spacetec in Augsburg: 6mm, 7mm, 9mm, 18mm, so basically all I have wanted, and all they have had at the moment. The prices are still increasing, though.
    Their home page reads: www.intercon-spacetec.de, they have also an e-mail address for asking.

    Best,

    JG
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    Default Re: Pentax SMC O-6mm, FUJIYAMA HD–OR 5mm, Baader Classic Ortho 6mm, in terrestrial te

    Thanks for this JG. Now for the night-time and lunar comparisons!

    Do the people across the valley know that you have been spying on them again?

    All the best,

    Dean

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    Default Re: Pentax SMC O-6mm, FUJIYAMA HD–OR 5mm, Baader Classic Ortho 6mm, in terrestrial te

    Quote Originally Posted by DeanD View Post
    Thanks for this JG. Now for the night-time and lunar comparisons!

    Do the people across the valley know that you have been spying on them again?

    All the best,

    Dean
    Thank you Dean!

    Well, they have got a pair of terrace chairs, the same ones as we have, but we have 4,
    and even if it is Sunday today, they have left a clothes horse on the terrace - something they should not do.

    Best,

    JG
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    Default Re: Pentax SMC O-6mm, FUJIYAMA HD–OR 5mm, Baader Classic Ortho 6mm, in terrestrial te

    Quote Originally Posted by j.gardavsky View Post
    Thank you Dean!

    Well, they have got a pair of terrace chairs, the same ones as we have, but we have 4,
    and even if it is Sunday today, they have left a clothes horse on the terrace - something they should not do.

    Best,

    JG
    I'm intrigued: is it illegal to have a clothes horse on the terrace?

    I guess nude sun-bathing is out too...
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    Default Re: Pentax SMC O-6mm, FUJIYAMA HD–OR 5mm, Baader Classic Ortho 6mm, in terrestrial te

    Quote Originally Posted by DeanD View Post
    I'm intrigued: is it illegal to have a clothes horse on the terrace?

    I guess nude sun-bathing is out too...
    Hello Dean,

    we normally don't wash laundry and hang the clothes out on Sundays in Germany,
    the way that people can see it when walking the street up or down around a house, I am afraid.


    Back to the eyepieces
    The tests of the short focus eyepieces on the planets and Moon have been already done and perfectly documented by Bill Paolini.
    My further tests, which take as a rule several observing sessions, will concentrate on the details in nebulae and in galaxies, which eventually require very high magnifications.
    The SMC multicoatings, as developed by Pentax (in suspected collaboration with Zeiss), are expected to offer higher transmissivity on the short blue wavelengths, important for observing especially the galaxies with the blue color index.
    And together with a minimum of glass in the Abbe orthos, high quality polish of the optics surfaces, and suppression of the stray and scattered light, the details I will be looking for, should be better visible.

    Best,

    JG
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    Default Re: Pentax SMC O-6mm, FUJIYAMA HD–OR 5mm, Baader Classic Ortho 6mm, in terrestrial te

    Thank you JG.
    The article on CN is excellent as well.
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    Default Re: Pentax SMC O-6mm, FUJIYAMA HD–OR 5mm, Baader Classic Ortho 6mm, in terrestrial te

    Thanks for the daylight comparison! Best wishes for weather to permit night time comparison....
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    Default Re: Pentax SMC O-6mm, FUJIYAMA HD–OR 5mm, Baader Classic Ortho 6mm, in terrestrial te

    Excellent comparison! I thought as much that the Pentax would outperform the other two. ( exept on the yellow-fringing) BCO comes very close though!
    Thanks for you review!
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