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glasbak · 09-05-2009, 10:42 AM

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Originally posted by deadwolfbones

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.

ivoire · 09-05-2009, 10:43 AM

Originally posted by deadwolfbones

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?

Blue · 09-05-2009, 11:09 AM

Originally posted by ivoire

T-mount threads?

Aren't those 44mm threads on t-mounts?

deadwolfbones · 09-05-2009, 12:04 PM

Originally posted by glasbak

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?

ivoire · 09-05-2009, 12:09 PM

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)

glasbak · 09-05-2009, 12:20 PM

Originally posted by deadwolfbones

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.

Ben_Edict · 09-05-2009, 12:36 PM

Originally posted by deadwolfbones

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

Ben_Edict · 09-05-2009, 12:38 PM

Originally posted by Blue

Aren't those 44mm threads on t-mounts?

no, that was the TX-mount... (fortunately that vanished... some confusion less.)
Ben

stevebrot · 09-05-2009, 02:24 PM

Originally posted by dadipentak

No, wait--it's brass?!

Careful! Careful! Wrong pitch = permanent damage!!!

Steve

(T mount is also 42mm)

**monochrome** · 09-05-2009, 02:34 PM

I believe the lower, lighter gray "threads" are actually light baffles. There are no set screws around the outside edge of the mount.

**dadipentak** · 09-06-2009, 06:11 AM

In case you're wondering whether it's worth the trouble...

Blue · 09-06-2009, 08:57 AM

If that were an Ivory Bill, you would be The Man.

deadwolfbones · 09-06-2009, 09:09 AM

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.

Blue · 09-06-2009, 10:19 AM

Originally posted by deadwolfbones

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.

deadwolfbones · 09-06-2009, 12:06 PM

Got an estimate from Eric of roughly $60 to fix the internals. Sounds like a helluva deal to me.

09-06-2009, 06:11 AM	#101
dadipentak Site Supporter Join Date: Jul 2008 Location: Baltimore, Maryland Photos: Gallery Posts: 11,590	Motivation In case you're wondering whether it's worth the trouble... Attached Images

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09-05-2009, 10:42 AM	#91
glasbak Veteran Member Join Date: Apr 2009 Location: Netherlands Posts: 369	Staff note: This post may contain affiliate links, which means Pentax Forums may earn a small commission if a visitor clicks through and makes a purchase. If you would like to support the forum directly, you may also make a donation here. Originally posted by deadwolfbones 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
ivoire Veteran Member Join Date: Mar 2007 Photos: Gallery Posts: 3,381	Originally posted by deadwolfbones 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
Blue Moderator Site Supporter Join Date: Jun 2008 Location: Florida Hill Country Photos: Gallery \| Albums Posts: 17,377	Originally posted by ivoire T-mount threads? Aren't those 44mm threads on t-mounts?

09-05-2009, 12:04 PM	#94
deadwolfbones Veteran Member Join Date: Sep 2007 Location: Santa Fe, NM Posts: 7,451 Original Poster	Originally posted by glasbak 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
ivoire Veteran Member Join Date: Mar 2007 Photos: Gallery Posts: 3,381	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
glasbak Veteran Member Join Date: Apr 2009 Location: Netherlands Posts: 369	Originally posted by deadwolfbones 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
Ben_Edict Veteran Member Join Date: Jul 2007 Location: SouthWest "Regio" Photos: Albums Posts: 3,309	Originally posted by deadwolfbones 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
Ben_Edict Veteran Member Join Date: Jul 2007 Location: SouthWest "Regio" Photos: Albums Posts: 3,309	Originally posted by Blue 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
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	Originally posted by dadipentak No, wait--it's brass?! Careful! Careful! Wrong pitch = permanent damage!!! Steve (T mount is also 42mm)

09-06-2009, 08:57 AM	#102
Blue Moderator Site Supporter Join Date: Jun 2008 Location: Florida Hill Country Photos: Gallery \| Albums Posts: 17,377	If that were an Ivory Bill, you would be The Man.

09-06-2009, 09:09 AM	#103
deadwolfbones Veteran Member Join Date: Sep 2007 Location: Santa Fe, NM Posts: 7,451 Original Poster	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
Blue Moderator Site Supporter Join Date: Jun 2008 Location: Florida Hill Country Photos: Gallery \| Albums Posts: 17,377	Originally posted by deadwolfbones 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
deadwolfbones Veteran Member Join Date: Sep 2007 Location: Santa Fe, NM Posts: 7,451 Original Poster	Got an estimate from Eric of roughly $60 to fix the internals. Sounds like a helluva deal to me.

S-M-C Takumar 1000mm f/8

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