Extensions

ctt · 06-14-2009, 02:23 PM

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!

geauxpez · 06-14-2009, 04:21 PM

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

ctt · 06-14-2009, 04:37 PM

Hi!

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

Tks!!!!

alohadave · 06-14-2009, 05:13 PM

Originally posted by ctt

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.

ctt · 06-14-2009, 05:36 PM

And what does the "42" stand for?

alohadave · 06-14-2009, 10:55 PM

Originally posted by ctt

And what does the "42" stand for?

42 mm thread.

M42 lens mount - Wikipedia, the free encyclopedia

ctt · 06-15-2009, 04:42 AM

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.)

alohadave · 06-15-2009, 06:53 AM

Originally posted by ctt

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.

06-14-2009, 02:23 PM	#1
ctt Senior Member Join Date: Jun 2007 Location: Tennessee Posts: 237	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!

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06-14-2009, 04:21 PM	#2
geauxpez Veteran Member Join Date: Jul 2008 Location: Atlanta Photos: Gallery Posts: 1,196	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 Senior Member Join Date: Jun 2007 Location: Tennessee Posts: 237 Original Poster	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
alohadave Veteran Member Join Date: Jan 2008 Location: Quincy, MA Photos: Gallery \| Albums Posts: 2,024	Originally posted by ctt 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 Senior Member Join Date: Jun 2007 Location: Tennessee Posts: 237 Original Poster	And what does the "42" stand for?

06-14-2009, 10:55 PM	#6
alohadave Veteran Member Join Date: Jan 2008 Location: Quincy, MA Photos: Gallery \| Albums Posts: 2,024	Originally posted by ctt 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 Senior Member Join Date: Jun 2007 Location: Tennessee Posts: 237 Original Poster	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
alohadave Veteran Member Join Date: Jan 2008 Location: Quincy, MA Photos: Gallery \| Albums Posts: 2,024	Originally posted by ctt 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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