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Swarovski STS80ED and a 30X eyepiece DCA, Nikon CP8400: Spot Metering, 1/30 Sec, Manual Exposure, 0 EV, f\ 4.9, Max Aperture 2.64, ISO 50, Focal Length 21.6mm, 35mm Equivalent 85mm.
Originally posted 4 months ago.
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royhalpin edited this topic 4 months ago.
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Kowa TSN 883 and a 30X eyepiece, TSN-DA10 camera adapter , Nikon CP8400: Spot Metering, 1/30 Sec, Manual Exposure, 0 EV, f\ 4.9, Max Aperture 2.64, ISO 50, Focal Length 21.6mm, 35mm Equivalent 85mm.
Posted 4 months ago.
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now that is really strange! Or maybe it isn't. The main difference I see is exposure...even though the exif list the f number as the same, isn't it the scope that limits it here...therefore the 88mm would be expected to deliver more light to the sensor than the 80mm...no matter what else is going on. The 88 might also reasonably be expected to show more detail...just physics...but I think there might be more extra detial in the 88 than the larger aperture can account for. Maybe. It is hard to see with the exposure being so different...especially given that the Swaro image looks starved for light. Who know what the sensor would have shown with equivalent exposure?
Posted 4 months ago.
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I also have an Aperture priority exposure set. I'll post later this week.
Posted 4 months ago.
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Roy- Would like to see the Swaro photo adjusted with "levels" so that the greens tones in the suet feeders are comparable. This would help our eyes make a comparison. Looking only at the nylon tie, the Kowa seems have a bit better resolution. A similar test using a standardized optical resolution target might be more interesting. Or maybe use a crisp new $10 bill for a target!
Len
Posted 4 months ago.
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Hi Roy
Thanks for your post. I am very interest is seeing a good side by side comparison between the two scopes.
I looked at the flickr link. One would expect the Kowa to be a little brighter but I would guess that the main difference is just due to light changes. From your exposure settings I am assuming it was rather overcast. The eye is not very sensitive to changes in light levels so it would be easy to not notice a difference. A better test image would be a sheet of paper with fine print, a newspaper will work. Attach it to a wall or fence that will see direct sunlight. If you would like to have a better test chart I would be happy to send you a chart similar to the one used for my testing of the Radian and Pentax eyepieces (see the files section in the folder Scott Walker's stuff). Black on white images are good because they make the aberrations more noticeable. Make sure the printed page fill the whole frame of the image. This way you can judge both the image quality at the center of the image and at its extremes. Print is easy to get a good focus on. If you post additional images on flickr please post much larger image files. The full resolution images would be the best. If you would like a test chart just e-mail me directly with your mailing address.
Scott Walker
Posted 4 months ago.
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If the focal length, shutter speed and f stop are considered there is only one conclusion. The Kowa is on the left
Originally posted 4 months ago.
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royhalpin edited this topic 4 months ago.
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Most any scope will take good images in good light. Gaining and f stop is everything...Roy
Posted 4 months ago.
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I was asked to do a contrast comparison so I did. It is difficult to see the difference here buy you can if you look. The Smallest bars on the Kowa (right side) are sharper and there is no purple fringing. These were shot in Manual to keep the EXIF the same. 1/30 @ 4.5.....best of 8 each scope
THIS IS THE ONLY PHOTO WITH THE SWAROVSKI ON THE LEFT
Originally posted 4 months ago.
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royhalpin edited this topic 3 months ago.
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The Kowa's looking good Roy.
Posted 4 months ago.
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The Kowa 20-60x Zoom TE10Z and the Swarovski 20-60sx zoom eyepieces. This was a difficult comparison to be fair and consistent. This is the comparison @ 20X using Aperture Priority on a CP8400. The EXIF file is displayed on the photos. The Scopes used were the Swarovski STS80HD and the Kowa TSN 884. The adapters were the Swarovski DCA-Zoom and the Kowa TSN-DA10 adapter. Numerous sets of 4 were taken between 9:50 AM and 11:50 AM EDT. The photos posted are the best of the best for 20X, 40X and 60X. The Kowa is on the left of each set. These photos have not been edited.
Originally posted 4 months ago.
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royhalpin edited this topic 4 months ago.
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The Best of the best the 40X shot....Kowa on the left.
Originally posted 4 months ago.
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royhalpin edited this topic 4 months ago.
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Best of th Best @ 60X.....Kowa on the left
Posted 4 months ago.
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Roy...just noticed in the last 3 comparison shots, when I hold the mouse pointer over the images the popup descirption box says "Swaro on left", yet, you say in the captions on the bottom that the Kowa image is on the left. Which is correct?
Posted 3 months ago.
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Thank you I have corrected the titles but if you notice the EXIF files that are printed on the photo clearly mark the Kowa and Swarovski on the top line.
Posted 3 months ago.
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Here are a few images taken with the Kowa while I was visiting with Roy recently. Taking in his back garden on an overcast/rainy Sunday.
The Kowa was nice and bright and the 25x eyepiece was very excellent for digiscoping. The build quality of whole system was second-to-none.
Vignetting on the F50 disappeared around 16mm.
Neil
farm3.static.flickr.com/2292/2435008605_0f156ab1c9_o.jpg
farm4.static.flickr.com/3253/2435825724_4b7556e3c9_o.jpg
farm3.static.flickr.com/2067/2435825792_cd74722a75_o.jpg
Posted 3 months ago.
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