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06-14-2009, 02:23 PM   #1
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Extensions

Hello:

Need advice on Extension tube sets. The prices on Ebay are all over the board, and I can't figure out what makes the differences. Anyone help?

Also, I see several ads for "42 mount", is this talking about the filter size? I'm waiting to use th extensions with my Pentax 100mm macro lens.

Any advice would be appreciated!

Tks!

06-14-2009, 04:21 PM   #2
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M42 mount refers to just that -- the camera mount. That is for screwmount cameras such as the Spotmatic series. More mordern Pentax cameras are K-mount and variations of K-mount. To use an M42 mount extension, you would have to get an adapter for the camera end ($30+ for a good one) and use screwmount lenses. If you have K-mount lenses, look for one of those. What camera are you shooting?

Good luck!

Adam
06-14-2009, 04:37 PM   #3
ctt
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Hi!

I have a K-10D, so I'm assuming that means I have a "K-mount'?

Tks!!!!
06-14-2009, 05:13 PM   #4
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QuoteOriginally posted by ctt Quote
Hi!

I have a K-10D, so I'm assuming that means I have a "K-mount'?

Tks!!!!
That is correct. You can buy an M42-K mount adapter if you want to use an M42 extension tube.

06-14-2009, 05:36 PM   #5
ctt
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And what does the "42" stand for?
06-14-2009, 10:55 PM   #6
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QuoteOriginally posted by ctt Quote
And what does the "42" stand for?
42 mm thread.

M42 lens mount - Wikipedia, the free encyclopedia
06-15-2009, 04:42 AM   #7
ctt
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So, if my macro is 49mm filter size, the 42mm wouldn't work, right?

Also, do you know why the prices for the extensions on Ebay are all over the board? (Within the same description of K-mount.)
06-15-2009, 06:53 AM   #8
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QuoteOriginally posted by ctt Quote
So, if my macro is 49mm filter size, the 42mm wouldn't work, right?

Also, do you know why the prices for the extensions on Ebay are all over the board? (Within the same description of K-mount.)
You are getting two different things confused. M42 refers to how the lens mounts to the camera. It is on the rear of the lens.

The filter thread size has nothing to do with that. It's a function of the physical size of the front of the lens.

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