T-Mount?

dantuyhoa · 10-10-2007, 10:13 PM

Originally posted by unkbar

I use the 800mm Solid CAT with my K10D.

The Pentax M42 screwmount and the T-mount are different. The M42 is 42mmX1mm and the T-mount is 42mmX0.75mm. That means one rotation of the thread moves the lens either .75 or 1 mm. They are NOT interchangable, you WILL ruin your lens if you try forcing it into the wrong adapter.

I was heartbroken to find that my 800mm Solid CAT runs into the flash housing on my K10D before it gets tight in the T-mount. Does your K100 have that problem, too? If I screw it about halfway into the T-mount, it seemed to focus to infinity okay, and it seemed pretty secure, so I'm planning to make a plastic disk to use as a spacer so I don't go scuffing the front of the flash housing everytime I use the lens. I'm not about to give up all that Perkin-Elmer goodness because of a mere mechanical mishap.

Can you share some shots taken with the 800 . Thanks .

dantuyhoa · 10-10-2007, 10:19 PM

Originally posted by Tom Lusk

Thanks for the input, everyone.

I'll give it a try.

And, yep! it is the Solid Cat! I was watching two of them.

The 450 went for $1295.00, but I got the mint 600 for just $395.00.

Now to see if this lens is as good as its reputation...

Tom

My T-mount has no brand name but made in Japan ( or so it says

) . Very good . The outer ring has 3 screws . Got it at local camera shop . 20 USD . Not cheap but but I got very good service from them .

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10-10-2007, 10:13 PM	#16
dantuyhoa Veteran Member Join Date: May 2007 Location: California Photos: Gallery Posts: 1,245	Originally posted by unkbar I use the 800mm Solid CAT with my K10D. The Pentax M42 screwmount and the T-mount are different. The M42 is 42mmX1mm and the T-mount is 42mmX0.75mm. That means one rotation of the thread moves the lens either .75 or 1 mm. They are NOT interchangable, you WILL ruin your lens if you try forcing it into the wrong adapter. I was heartbroken to find that my 800mm Solid CAT runs into the flash housing on my K10D before it gets tight in the T-mount. Does your K100 have that problem, too? If I screw it about halfway into the T-mount, it seemed to focus to infinity okay, and it seemed pretty secure, so I'm planning to make a plastic disk to use as a spacer so I don't go scuffing the front of the flash housing everytime I use the lens. I'm not about to give up all that Perkin-Elmer goodness because of a mere mechanical mishap. Can you share some shots taken with the 800 . Thanks .

10-10-2007, 10:19 PM	#17
dantuyhoa Veteran Member Join Date: May 2007 Location: California Photos: Gallery Posts: 1,245	Originally posted by Tom Lusk Thanks for the input, everyone. I'll give it a try. And, yep! it is the Solid Cat! I was watching two of them. The 450 went for $1295.00, but I got the mint 600 for just $395.00. Now to see if this lens is as good as its reputation... Tom My T-mount has no brand name but made in Japan ( or so it says ) . Very good . The outer ring has 3 screws . Got it at local camera shop . 20 USD . Not cheap but but I got very good service from them .