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200mm APO HS filter issue

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awa54 View Drop Down
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Joined: 03 November 2008
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Post Options Post Options   Quote awa54 Quote  Post ReplyReply Direct Link To This Post Posted: 21 September 2018 at 18:14
That is what I'm hoping the case is! I would guess that if it had been this way on the assembly line it wouldn't have passed QC, but it could certainly be a hybrid of two damaged lenses or the like, which could easily explain things.
a900, a700 and plenty of glass ;)
 



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awa54 View Drop Down
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Post Options Post Options   Quote awa54 Quote  Post ReplyReply Direct Link To This Post Posted: 27 September 2018 at 13:27
I'm taking advantage of my brother's 3D printer and making an adapter shim to allow the glass from a Hoya UV filter to fit the frame of the old Tiffen filter. It will give the glass an extra 1mm of clearance past the top of the filter threads... The Tiffen filter frame already works fine as a spacer for a separate UV filter, but this will be cleaner looking and save some overall length in my camera pack.
a900, a700 and plenty of glass ;)
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awa54 View Drop Down
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Post Options Post Options   Quote awa54 Quote  Post ReplyReply Direct Link To This Post Posted: 29 October 2018 at 05:34
...bushing to fit the glass from a Hoya UV0 to the frame from an uncoated Tiffen, check. Result: meh.

The Tiffen frame has a tiny step where the glass seats, which makes the bushing fit poorly, so rather than re-design the shim, I just used the low-profile ring from the cannibalized UV0 as the spacer for my original UVC, it saved about 2.5mm compared to the monster Tiffen filter frame and the coatings on the UVC seem to be better than on the old production UV0.

Bottom line, the filter now clears the front element and the lens still makes fantastic images, so I'm set! OCD issues have been banished by the continuing excellence of the results from this quirky old lens.
a900, a700 and plenty of glass ;)
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awa54 View Drop Down
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Post Options Post Options   Quote awa54 Quote  Post ReplyReply Direct Link To This Post Posted: 10 August 2019 at 05:04
UPDATE

Never assume that a lens came to you un-tampered with...

It turns out that some previous owner or service person had threaded the front shroud (contains the focus ring cover and hood) back away from the hard stop it hits when threaded all the way forward, they then locked it in the wrong position with the tiny set screw.

I was messing around with this part of the lens, trying to figure out if it would be practical to replace the missing friction ring that prevents the hood from flopping around when not engaged, when I realized that the correct position for that assembly was fully forward. Eureka, slim filter now clears the front element by several millimeters!

a900, a700 and plenty of glass ;)
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sybersitizen View Drop Down
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Post Options Post Options   Quote sybersitizen Quote  Post ReplyReply Direct Link To This Post Posted: 10 August 2019 at 05:38
I see. Then I was right way back when I said Apparently there's something weird about yours.
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