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Martin Snajdr · 07-05-2013, 02:34 PM

Hello all,

are all the standart 105mm Takumars for 6x7 radioactive? In this post on Camerapedia there is listed only the Super Takumar 105mm (the first version of this lens). I have the SMC Takumar and my lens serial number is 8514138, so I assume it is a later one (maybe I'm wrong).

I ask because I was joking about the lens radioactivity and since then, my mother have forced me to get rid of it. She says she doesn't want something like that in our house. Well I hope you are not rolling on the floor laughing right now.

Thanks!

Adam · 07-05-2013, 02:37 PM

Originally posted by Martin Snajdr

Well I hope you are not rolling on the floor laughing right now

Bananas are radioactive too

Seriously though, unless you hug the lens every day while your sleep, it's not going to hurt anyone or anything.

Reliant K1000 · 07-05-2013, 02:52 PM - **1 Like**

You'll get worse radioactivity from your smoke alarm. And you're supposed to have one on each floor!

Heck - the Sun is radioactive...better keep indoors. Wait - there's that lens and that smoke alarm...

carrrlangas · 07-05-2013, 03:37 PM

Originally posted by Adam

unless you hug the lens every day while your sleep,

hahahahsdagkzdriv kz!!

tclausen · 07-05-2013, 03:43 PM

Originally posted by Adam

Bananas are radioactive too

Seriously though, unless you hug the lens every day while your sleep, it's not going to hurt anyone or anything.

Wait, you mean to tell me that you /don't/, Adam?

(I'll let it slide that apparently you sleep during the /day/ ...)

desertscape · 07-05-2013, 05:02 PM

I believe it was only the 105 Super-Takumar that used Thorium glass and not the Takumars that followed. Designers wanted to use glass made with high atomic number elements for their high refractive index benefits.

**stevebrot** · 07-05-2013, 05:16 PM

Originally posted by Adam

Bananas are radioactive too

...as are people. The average person has about 350x the radioactivity of the average banana.

Banana equivalent dose - Wikipedia, the free encyclopedia

**THoog** · 07-05-2013, 07:14 PM

So Spider-Man is actually a banana spider that was bitten by a radioactive human?

Wait... what kind of lenses did Peter Parker use?

Silent Street · 07-05-2013, 07:43 PM

Ever had an x-ray? Or MRI? Or a CT scan? Any one of those will deliver much more radiation to you than a Takumar lens ever will. So too, a microwave oven 5 second after stopping. Thorium in lenses is becoming a nauseating serial offender in internet threads. Love the lens for its novelty value rather than the perceived hazard is presents to life.

Martin Snajdr · 07-05-2013, 11:37 PM - **2 Likes**

Originally posted by desertscape

I believe it was only the 105 Super-Takumar that used Thorium glass and not the Takumars that followed. Designers wanted to use glass made with high atomic number elements for their high refractive index benefits.

Thank you for answering my question and not making fun of me

!

07-05-2013, 02:34 PM	#1
Martin Snajdr New Member Join Date: Jul 2013 Posts: 5	SMC Takumar 105mm f2.4 radioactivity Hello all, are all the standart 105mm Takumars for 6x7 radioactive? In this post on Camerapedia there is listed only the Super Takumar 105mm (the first version of this lens). I have the SMC Takumar and my lens serial number is 8514138, so I assume it is a later one (maybe I'm wrong). I ask because I was joking about the lens radioactivity and since then, my mother have forced me to get rid of it. She says she doesn't want something like that in our house. Well I hope you are not rolling on the floor laughing right now. Thanks!

07-05-2013, 02:37 PM	#2
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,430	Originally posted by Martin Snajdr Well I hope you are not rolling on the floor laughing right now Bananas are radioactive too Seriously though, unless you hug the lens every day while your sleep, it's not going to hurt anyone or anything. Adam PentaxForums.com Webmaster (Site Usage Guide \| Site Help \| My Photography) PentaxForums.com server and development costs are user-supported. You can help cover these costs by donating. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, KEH, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

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07-05-2013, 02:52 PM - 1 Like	#3
Reliant K1000 Senior Member Join Date: Nov 2012 Location: BC - On the 49th parallel Photos: Gallery \| Albums Posts: 235	You'll get worse radioactivity from your smoke alarm. And you're supposed to have one on each floor! Heck - the Sun is radioactive...better keep indoors. Wait - there's that lens and that smoke alarm...

07-05-2013, 03:37 PM	#4
carrrlangas Veteran Member Join Date: Mar 2012 Location: Joensuu (Finland) Photos: Gallery Posts: 1,761	Originally posted by Adam unless you hug the lens every day while your sleep, hahahahsdagkzdriv kz!!

07-05-2013, 03:43 PM	#5
tclausen Veteran Member Join Date: May 2012 Posts: 1,397	Originally posted by Adam Bananas are radioactive too Seriously though, unless you hug the lens every day while your sleep, it's not going to hurt anyone or anything. Wait, you mean to tell me that you /don't/, Adam? (I'll let it slide that apparently you sleep during the /day/ ...)

07-05-2013, 05:02 PM	#6
desertscape Pentaxian Join Date: Feb 2009 Location: Arizona Posts: 1,271	I believe it was only the 105 Super-Takumar that used Thorium glass and not the Takumars that followed. Designers wanted to use glass made with high atomic number elements for their high refractive index benefits.

07-05-2013, 05:16 PM	#7
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	Originally posted by Adam Bananas are radioactive too ...as are people. The average person has about 350x the radioactivity of the average banana. Banana equivalent dose - Wikipedia, the free encyclopedia

07-05-2013, 07:14 PM	#8
THoog Loyal Site Supporter Join Date: Aug 2012 Location: North Carolina Photos: Gallery \| Albums Posts: 3,684	So Spider-Man is actually a banana spider that was bitten by a radioactive human? Wait... what kind of lenses did Peter Parker use?

07-05-2013, 07:43 PM	#9
Silent Street Veteran Member Join Date: Nov 2011 Location: Castlemaine, Victoria, AUS Photos: Albums Posts: 1,128	Ever had an x-ray? Or MRI? Or a CT scan? Any one of those will deliver much more radiation to you than a Takumar lens ever will. So too, a microwave oven 5 second after stopping. Thorium in lenses is becoming a nauseating serial offender in internet threads. Love the lens for its novelty value rather than the perceived hazard is presents to life.

07-05-2013, 11:37 PM - 2 Likes	#10
Martin Snajdr New Member Join Date: Jul 2013 Posts: 5 Original Poster	Originally posted by desertscape I believe it was only the 105 Super-Takumar that used Thorium glass and not the Takumars that followed. Designers wanted to use glass made with high atomic number elements for their high refractive index benefits. Thank you for answering my question and not making fun of me !

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SMC Takumar 105mm f2.4 radioactivity

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