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Anonymous
Unresponsive aperture ring on rokinon 8mm 2016-07-29 02:05:17 Post No. 2891824
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Unresponsive aperture ring on rokinon 8mm 2016-07-29 02:05:17 Post No. 2891824
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Taking apart my rokinon 8mm to see why the aperture ring is not responsive. Clearly something is not catching just not quite sure what's not catching. Could someone help?
[EXIF data available. Click here to show/hide.]
Camera-Specific Properties: Equipment Make Apple Camera Model iPhone 6s Plus Camera Software 9.3.2 Sensing Method One-Chip Color Area Focal Length (35mm Equiv) 29 mm Image-Specific Properties: Image Orientation Top, Left-Hand Horizontal Resolution 72 dpi Vertical Resolution 72 dpi Image Created 2016:07:28 22:03:08 Exposure Time 1/4 sec F-Number f/2.2 Exposure Program Normal Program ISO Speed Rating 125 Lens Aperture f/2.2 Brightness -1.4 EV Exposure Bias 0 EV Metering Mode Spot Flash No Flash, Compulsory Focal Length 4.15 mm Color Space Information sRGB Image Width 4032 Image Height 3024 Exposure Mode Auto White Balance Auto Scene Capture Type Standard
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Well it looks like the whole back of the lens fell off.
Theres your problem. Next.
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448KB, 2048x1172px
Welcome to /p/
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It's kinda impossible to tell what's wrong by looking at the photo, unless somebody happens to know this lens really well. I bet I could troubleshoot it if I actually had the lens in hand, but I don't see anything obvious from here.
The best advice I can give is to find the lever or whatever that most directly controls the aperture, and then work your way "out" from there, and see if you can find the pin, lever, or whatever that should be pushing the other components but isn't.
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>>2891837
yea i realized it was kind of a long shot posting for help, but every video i've watched so far hasn't helped. I believe the C frame piece on the top of lens is whats not connecting to some piece
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>>2891824
Oil on the blades?
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>>2891824
Can you open and close the aperture manually or are the blades stuck?
What's that little silver pin?
The part of the yellow ring curving inwards looks like what's usually supposed to pass the chosen aperture when you turn the ring to the aperture mechanism by pushing something down.
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Is it plastic or metal inside?
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>>2891824
is that spring still in tension?
seems to be ok, judging by this vid.
https://www.youtube.com/watch?v=X7_zN9C5QKE
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>>2892132
unless by "unresponsive" you mean "not clicking" then you're missing the small bearing and the spring :D
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>>2891824
check the aperture ring.
Thread posts: 11
Thread images: 2
Thread images: 2