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03-05-2011, 12:38 AM   #1
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Numbers stamped on the Takumar lenses

Hi newbee here. please could someone inform me what the no means which is stamped on the rear of the am lever on the taks.
Thanks

03-05-2011, 01:26 AM   #2
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They're aperture numbers: http://en.wikipedia.org/wiki/Aperture

A smaller number means that there's a bigger hole and thus more light passes through the lens. Larger numbers mean the opposite.

Then the number is small, the depth of field is small as well- i.e. not as much is sharp beyond the focal point as at larger apertures, and vice-versa for large numbers.

Here's an article with more on DOF and aperture use: https://www.pentaxforums.com/forums/photography-articles/126203-stops-shutter...nsitivity.html

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03-05-2011, 01:45 AM   #3
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Hi yes i understand those numbers but on the back of the auto and manual lever on the 50-55 taks is a no that is stamped that's the one i would like to know what it means
03-05-2011, 02:00 AM   #4
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Are you talking about a serial number?
Give a few examples and that may help people help you.

03-05-2011, 02:22 AM   #5
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Okay sorry the serial no on the am lever not the serial on the front of the lens. ill post a pic when i get home for clarification thanks.
03-05-2011, 02:25 AM   #6
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The number on the auto/manual switch is the part number. Sometimes there will be two or three generations of a Takumar lens and the part number will change with each generation. With other lenses the part number remains the same through the entire production run. As an example, my SMC 135 f/3.5 is designated 43542, with a serial number in the 5.9 million range.
03-05-2011, 05:43 AM   #7
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Yip that's the one thanks Steinback.
Has any one used the chipped adapters on the mf taks and how do you find them to work.
03-05-2011, 05:50 AM   #8
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Sorry, but what's a chipped adapter ?

03-05-2011, 07:10 AM   #9
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Its a m42-manual focus adapter with focus confirmation for use on theTakumar lenses
03-05-2011, 08:17 AM   #10
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QuoteOriginally posted by mcgphoto Quote
Has any one used the chipped adapters on the mf taks and how do you find them to work.
Never seen one - but since most (if not all) of the Pentax DSLRs have focus confirmation in the viewfinder why would one be necessary??
03-05-2011, 08:40 AM   #11
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"Chipped Adapter" that's a new one to me. Focus confirmation does not require a chip to function. All that is necessary is the proper pin to be grounded. Some M42 lenses are large enough to ground the pin themselves. A Super Tak 50 is not wide enough. In this case you need to ground the pin with some foil tape.

Not all Taks have a number on the A/M switch. I have an 8-element Super Tak that does not. A 7-element Super Tak that does. An Auto-Tak 55 that doesn't and a SMC Tak 55 that does.
03-05-2011, 11:33 AM   #12
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Okay its the m42 adapter one uses on m/f lenses for eg a canon 40d it fools the camera into thinking there's a normal lens on and your focus light will come on instead of trying to get manual focus through your eye piece.
03-05-2011, 11:43 AM   #13
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QuoteOriginally posted by mcgphoto Quote
Okay its the m42 adapter one uses on m/f lenses for eg a canon 40d it fools the camera into thinking there's a normal lens on and your focus light will come on instead of trying to get manual focus through your eye piece.
Ah, you didn't specify that you were one of those who drive up the prices of our Taks
03-05-2011, 12:15 PM   #14
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What you mean over here they range from 10 pounds for a 55 1.8 in good condition to a 200 f4 for 40-50 pounds just have to look.
I bought my spotmatic with a super tak 50 1.4 for 50 pounds in excellent condition.
03-05-2011, 12:27 PM   #15
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QuoteOriginally posted by mcgphoto Quote
Okay its the m42 adapter one uses on m/f lenses for eg a canon 40d it fools the camera into thinking there's a normal lens on and your focus light will come on instead of trying to get manual focus through your eye piece.
Be pretty tough using that Canon adapter on a Pentax DSLR.
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