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02-26-2013, 04:05 PM   #1
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Flexar 400mm f6.3

Morning all,

I recently picked up an old Flexar 400mm 6.3. I'm assuming its just a generic lens of some description?



Anyway; the mount point is this:



It seems removable with the three little screws; but is this some kind of generic mount piece? Can I get a K-mount version to replace it?

Cheers,
Lurch

02-26-2013, 04:13 PM   #2
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T-mount - Wikipedia, the free encyclopedia

You will need a T-ring adapter to attach it to the camera. For example...

General Brand T-Mount SLR Camera Adapter for Pentax K ATPK B&H

You should be able to get one cheaper locally.
02-26-2013, 04:15 PM   #3
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*Ding* - thanks mate.
I thought that was the case, but I got confused between a t-mount and an adaptall?
02-26-2013, 04:19 PM   #4
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QuoteOriginally posted by Lurch Quote
*Ding* - thanks mate.
I thought that was the case, but I got confused between a t-mount and an adaptall?
Adaptall is a later mount that allowed for automated aperture.

Matt's Classic Cameras: Tamron Adaptall-2 System

The other systems were Soligor's T4 mount which evolved into the Vivitar TX mount. Sigma had the YS mount.

02-26-2013, 04:22 PM   #5
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Ahh - gotchya.

BTW; is there any real benefit to replacing the T-Mount as opposed to just using a M42/K adapter on teh existing T-Mount?
02-26-2013, 04:29 PM   #6
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QuoteOriginally posted by Lurch Quote
Ahh - gotchya.

BTW; is there any real benefit to replacing the T-Mount as opposed to just using a M42/K adapter on teh existing T-Mount?
No, just get an adapter. That's what you're supposed to do -- there is no such thing as "t-mount camera".

They're cheap. This one is good:

T2 T Mount T Ring Adapter for Pentax K PK K 7 K x K20D | eBay

The thing that is removable probably *is* an adapter -- m42 I suspect. Underneath it are the t-mount screws (which are also 42mm, but different pitch).
02-26-2013, 04:34 PM   #7
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Ahh - ok; let me re-phrase that..
I figure I can either:
Get a whole new T-Mount > PK Adapter or
Just get a M42>PK adapter to screw onto the existing T-Mount > M42 adapter.
02-26-2013, 05:00 PM   #8
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QuoteOriginally posted by Lurch Quote
Ahh - ok; let me re-phrase that..
I figure I can either:
Get a whole new T-Mount > PK Adapter or
Just get a M42>PK adapter to screw onto the existing T-Mount > M42 adapter.
There are 2 parts to the T-mount. The first is the T-mount adapter that is already on the lens. That is a 42mm x .75 mm thread pitch. (M42 is 42mm x 1mm). The second part is the T-ring adapter. That is the part that mounts the lens to the camera. What you need is the T->PK ring.

02-26-2013, 05:05 PM   #9
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QuoteOriginally posted by Lurch Quote
Ahh - ok; let me re-phrase that..
I figure I can either:
Get a whole new T-Mount > PK Adapter or
Just get a M42>PK adapter to screw onto the existing T-Mount > M42 adapter.
One adapter or another, yes. Don't spend too much -- that lens probably isn't worth it. There are a million of those generic t-mount 400/6.3s out there and most of them are relatively crappy. Expect heavy lateral CA on the edges -- this is a lens that actually becomes sharper in post-processing if you have Lightroom 4 or similar because it will rescale the misaligned colors. You can get a decent image of it (at least in the center) if you stop down to f11 and use a tripod.
02-26-2013, 05:11 PM   #10
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As Boriscleto says, the thread pitch is different, You will be able to screw the M42 adapter on the T2 mount about 1 turn before it stops, if you try forcing them together, you'll ruin one or both parts, rendering your lens useless. Safest to get a T-K ring.
02-26-2013, 05:29 PM   #11
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Hmm...
This lense only seems to have one 'bit'



And the screw size is definitely M42
02-26-2013, 05:36 PM   #12
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I think you've left part of the adapter on -- t-mount adapters are often built like that with an inner ring that comes out. You should be able to unscrew the remaining ring...
02-26-2013, 05:46 PM   #13
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Ah-HAH!!



Thanks guys!
02-26-2013, 05:54 PM   #14
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Yeah, so you could have just unscrewed it I guess (sometimes they are locked down though). So that ring goes back in the adapter -- not sure why they make them like that...
02-26-2013, 05:56 PM   #15
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So its the bit on the far right I want to replace with a K version?
I cant help but think that with this lens meaning to sit on a tripod, just putting a simply M42>K adapter would have the strength.
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