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Thread: Tele Vue 17.3mm Delos against Zeiss 23x 30x B WW 17.1mm

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    Default Re: Tele Vue 17.3mm Delos against Zeiss 23x 30x B WW 17.1mm



    Quote Originally Posted by Don Alvarez View Post
    Awesome stuff as always JG.

    Is it me, or is there a marked difference on the foreground shrubbery, the awning mounted on the wall behind it and the doorframe on the left? The image on the Delos looks noticeably softer in this area. Trick of the camera maybe?
    It's not just you. I see what you are talking about.
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    Default Re: Tele Vue 17.3mm Delos against Zeiss 23x 30x B WW 17.1mm

    It seems the image on the right is sharper.
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    Default Re: Tele Vue 17.3mm Delos against Zeiss 23x 30x B WW 17.1mm

    The foreground shrubbery in the lower left of the scene is clearly sharper with the Zeiss (on the right) than with the Delos (on the left). However, the upper right area of the scene, i.e. the satellite dish, the point where the dormer joins the roof, and the plant in the window all look sharper to me in the left image than in the right.

    It's all very interesting and I'm pleased to read good things about the Delos, since I have that one and am quite unlikely to ever have the Zeiss!
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    Default Re: Tele Vue 17.3mm Delos against Zeiss 23x 30x B WW 17.1mm

    Quote Originally Posted by kanadalainen View Post
    It seems the image on the right is sharper.
    Hello Ian, hello all,

    the camera captures have been made on the 13th June: Delos at 14:03, and Zeiss at 14:06, so the seeing and the light conditions have been the same, the outside temperature has been 15°C.
    The megabyte heavy camera captures I have once again inspected, show slightly sharper details through the Zeiss, also on the red roof.

    When observing at the medium magnifications around 44x, the difference has been hardly noticeable. Whenever the Zeiss has shown some very fine detail, I have later found it with the Delos as well. When the photos are enlarged, then a difference may pop up.

    Otherwise,
    I have somehow forgotten to post a comment on the field stop in the both eyepieces.
    The Delos shows a fairly bright blue fringe around the field stop.
    The Zeiss shows a faint green-yellow fringe around the field stop, frequently seen on the eyepieces used in the sports optics.

    The blue fringe, seldom seen in the todays eyepieces, indicates an undercorrection in blue and an expected improved correction on the long wavelengths.
    The green-yellow fringe is expected to balance the C-e-F deviations from the focus. So, the blue 'C' and the red 'F' deviations become to some small extent suppressed, and the deviations around the green spectral line 'e' a little bit enhanced.

    Best,

    JG
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    Default Re: Tele Vue 17.3mm Delos against Zeiss 23x 30x B WW 17.1mm

    Hello Mary, hello all,

    and thank you for your interest in photo documentation.

    Today, I have repeated the phototest on the apartments building 6km away across the valley, during the sunset.
    The capture with the Delos has been at 20:53, and the capture with the Zeiss has been at 20:58.
    Telescope: Sky-Watcher (Synta) 6" F/5 achromatic refractor, Lumix Panasonic GF7 with the Olympus 1.8/25 lens, 200ASA, automatic P setting. No postprocessing. The turbulence of air has been practically zero.

    The first picture shows the evaluated scene as captured through the Delos.
    The other pictures with the strips show the captures through the Delos above and through the Zeiss below, always for comparison.

    Enjoy looking for the differences,

    JG
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    Default Re: Tele Vue 17.3mm Delos against Zeiss 23x 30x B WW 17.1mm

    These look closer to me than the first comparisons you posted but I still give the nod to Zeiss.
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    Default Re: Tele Vue 17.3mm Delos against Zeiss 23x 30x B WW 17.1mm

    Quote Originally Posted by j.gardavsky View Post
    Hello Mary, hello all,

    and thank you for your interest in photo documentation.
    I am enjoying this immensely.

    Today, I have repeated the phototest on the apartments building 6km away across the valley, during the sunset.
    The capture with the Delos has been at 20:53, and the capture with the Zeiss has been at 20:58.
    Telescope: Sky-Watcher (Synta) 6" F/5 achromatic refractor, Lumix Panasonic GF7 with the Olympus 1.8/25 lens, 200ASA, automatic P setting. No postprocessing. The turbulence of air has been practically zero.

    The first picture shows the evaluated scene as captured through the Delos.
    The other pictures with the strips show the captures through the Delos above and through the Zeiss below, always for comparison.

    Enjoy looking for the differences,

    JG
    Quote Originally Posted by not_Fritz_Argelander View Post
    These look closer to me than the first comparisons you posted but I still give the nod to Zeiss.
    I agree with not_Fritz. I can consistantly pick out that the Zeiss is sharper. Its very close, but I can always seem to find a feature from one to the other that reveals this to be the case.

    I will say this though, and I preface this by saying I understand the Zeiss photo was taken 5 minutes after the Televue, that to my eye the Delos image is also brighter. I don't know if that can be reconciled by the five minutes difference, the shadow on the door in the third pic has certainly changed position. But it is especially apparent in the fourth photo looking at the dark roof surface, and looking at those surfaces that are reflecting the sunlight. The Delos is consistently brighter while the Zeiss gives those reflective areas almost a copper hue. Picture 3, this is very noticeable on the balcony facings right in the center of the frame and picture 4 on the large window to the left and also on the dormer facings.

    I'm doubly interested now in a nighttime comparison between these two.

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    Default Re: Tele Vue 17.3mm Delos against Zeiss 23x 30x B WW 17.1mm

    Quote Originally Posted by Don Alvarez View Post
    I am enjoying this immensely.



    I agree with not_Fritz. I can consistantly pick out that the Zeiss is sharper. Its very close, but I can always seem to find a feature from one to the other that reveals this to be the case.

    I will say this though, and I preface this by saying I understand the Zeiss photo was taken 5 minutes after the Televue, that to my eye the Delos image is also brighter. I don't know if that can be reconciled by the five minutes difference, the shadow on the door in the third pic has certainly changed position. But it is especially apparent in the fourth photo looking at the dark roof surface, and looking at those surfaces that are reflecting the sunlight. The Delos is consistently brighter while the Zeiss gives those reflective areas almost a copper hue. Picture 3, this is very noticeable on the balcony facings right in the center of the frame and picture 4 on the large window to the left and also on the dormer facings.

    I'm doubly interested now in a nighttime comparison between these two.
    I could well believe that 5 minutes deepening of shadow could account for a significant bit of the difference.
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    Default Re: Tele Vue 17.3mm Delos against Zeiss 23x 30x B WW 17.1mm

    Quote Originally Posted by not_Fritz_Argelander View Post
    I could well believe that 5 minutes deepening of shadow could account for a significant bit of the difference.
    There's only one way to know for sure.

    JG, can we please get two pictures taken with each eyepiece in the reverse order, same time of day, identical atmospheric conditions, five minutes apart, at your earliest convenience.

    Thank you.

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    Default Re: Tele Vue 17.3mm Delos against Zeiss 23x 30x B WW 17.1mm

    Quote Originally Posted by Don Alvarez View Post
    There's only one way to know for sure.

    JG, can we please get two pictures taken with each eyepiece in the reverse order, same time of day, identical atmospheric conditions, five minutes apart, at your earliest convenience.

    Thank you.

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    Yep!
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