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09-05-2009, 10:42 AM   #91
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QuoteOriginally posted by deadwolfbones Quote
Waaaaait... just had another look, and I think it may actually be a M42 screw that the Nikon mount is screwed into (based on nothing more scientific than holding the base of my J-9 up to the Nikon mount and noting that it very nearly but not quite fits inside).
That is the T2 thread (42x0.75), its NOT M42 (42x1), just buy a K mount T2 adapter.

09-05-2009, 10:43 AM   #92
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QuoteOriginally posted by deadwolfbones Quote
Waaaaait... just had another look, and I think it may actually be a M42 screw that the Nikon mount is screwed into (based on nothing more scientific than holding the base of my J-9 up to the Nikon mount and noting that it very nearly but not quite fits inside).
T-mount threads?
09-05-2009, 11:09 AM   #93
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QuoteOriginally posted by ivoire Quote
T-mount threads?
Aren't those 44mm threads on t-mounts?
09-05-2009, 12:04 PM   #94
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QuoteOriginally posted by glasbak Quote
That is the T2 thread (42x0.75), its NOT M42 (42x1), just buy a K mount T2 adapter.
Well, I can't get the F-mount unscrewed from it, so I'd need a T2 mount and then a T2->K-mount adapter, right?

09-05-2009, 12:09 PM   #95
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Look at this and see if it looks like it will work: T mount Adapter for PENTAX K mount cameras

T mount Adapter for PENTAX K mount cameras - eBay (item 270450887548 end time Oct-01-09 22:48:44 PDT)
09-05-2009, 12:20 PM   #96
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QuoteOriginally posted by deadwolfbones Quote
Well, I can't get the F-mount unscrewed from it, so I'd need a T2 mount and then a T2->K-mount adapter, right?
As I mentioned before, a T2 adapter is made up of 2 parts.
If you buy a K-mount (or whatever mount) T2 adapter you get the 2 parts.
The front of a T2 adapter has 42x0.75 thread, the back the K (or whatever) mount.
If you cannot unscrew the F mount T2 adapter, you can take the T2 adapter apart, unscrew the 3 small screws in the F-mount.
Then you must find a K mount T2 adapter which fits perfect over the dovetail ring.
unfortunately not all T2 adapters have the same diameter dovetail ring, so best go to a bigger photo shop, they usually have a drawer of rings, and buy the K mount T2 adapter that fits.
09-05-2009, 12:36 PM   #97
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QuoteOriginally posted by deadwolfbones Quote
Well, I can't get the F-mount unscrewed from it, so I'd need a T2 mount and then a T2->K-mount adapter, right?
Basically yes. But if the Nikon-T2-adapter is stuck, you can simply unscrew the three set screws, take off the bayonett ring and replace it with the same part from the K-T2-adapter.

Ben
09-05-2009, 12:38 PM   #98
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QuoteOriginally posted by Blue Quote
Aren't those 44mm threads on t-mounts?
no, that was the TX-mount... (fortunately that vanished... some confusion less.)
Ben

09-05-2009, 02:24 PM   #99
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QuoteOriginally posted by dadipentak Quote
No, wait--it's brass?!
Careful! Careful! Wrong pitch = permanent damage!!!

Steve

(T mount is also 42mm)
09-05-2009, 02:34 PM   #100
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Quick and dirty hand-held T-Mount example

I believe the lower, lighter gray "threads" are actually light baffles. There are no set screws around the outside edge of the mount.
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Last edited by monochrome; 09-06-2009 at 05:55 PM.
09-06-2009, 06:11 AM   #101
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Motivation

In case you're wondering whether it's worth the trouble...
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09-06-2009, 08:57 AM   #102
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If that were an Ivory Bill, you would be The Man.
09-06-2009, 09:09 AM   #103
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Now that we've basically figured out the mount, I'm in conversation with Eric over whether it's worth it to fix the internals.
09-06-2009, 10:19 AM   #104
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QuoteOriginally posted by deadwolfbones Quote
Now that we've basically figured out the mount, I'm in conversation with Eric over whether it's worth it to fix the internals.
With the price you paid for it, It will likely be worth the cost to fix it. Granted, that thing isn't cheap to ship, but Eric will likely give you an estimate for no charge. Look at it in the context of a new FA 600mm f4 costing $10K.
09-06-2009, 12:06 PM   #105
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Got an estimate from Eric of roughly $60 to fix the internals. Sounds like a helluva deal to me.
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