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jay
Joined: 09 Jan 2016
Posts: 1
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 Posted: Sat Jan 09, 2016 4:49 pm Post subject: Max non operating temperature limit for manual lens |
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jay wrote:
Hi All,
This is my first post, but I've been reading a lot in this forum and learnt a lot.
I recently purchased E-m10 and decided I'll buy manual lenses and possibly Lens turbo II. I'm planning to go around thrift shops and see if I can get any good ones. I'm looking for MD rokkor 50/1.4, Pentax M 50/2, SMC M28/2.8 and Vivitar 35/2.8.
I'm little bud bug phobic to be honest. I never bought anything used before and I'm concerned I may bring in the little buggers into my home accidentally. Even hough the lenses are not exactly beds where they live, I read that the bugs move around to nest in all nook and cranny.
I also read that the bugs and eggs destroy at 120F (40C). So, I'm planning to put them in an oven and heat them to 120F to destroy any bugs in there. I was wondering if anyone has any advise for me regarding heating the lens gradually and holding it at 120F for an hours and gradually cooling it down.
Am I concerned unnecessarily? Am I too paranoid? Do anyone have any similar experiences? Sorry for a paronoid post, being thinking for a long time to post this, but I just made up my mind to ask.
Thanks
Jay |
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Lloydy
Joined: 02 Sep 2009
Posts: 7785
Location: Ironbridge. UK.
Expire: 2022-01-01
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| Posted: Sat Jan 09, 2016 5:34 pm Post subject: |
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Lloydy wrote:
That's way too hot. The lenses will be wrecked.
And too be honest, I think the risk of bugs being imported inside a lens is no greater than bringing most other things into your home. I would keep the lenses in an airtight Tupperware container for a few days, that should kill any that might be there.
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DConvert
Joined: 12 Jun 2010
Posts: 902
Location: Essex UK
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| Posted: Sat Jan 09, 2016 6:11 pm Post subject: |
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DConvert wrote:
| Lloydy wrote: |
That's way too hot. The lenses will be wrecked.
And too be honest, I think the risk of bugs being imported inside a lens is no greater than bringing most other things into your home. I would keep the lenses in an airtight Tupperware container for a few days, that should kill any that might be there. |
40C isn't hot enough to kill many bugs, parts of Africa regularly reach such temperatures.
But I agree that there's no greater risk of bugs in lenses than on your shoes, trousers or just through an open window. |
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kansalliskala
Joined: 19 Jul 2007
Posts: 5028
Location: Southern Finland countryside
Expire: 2016-12-30
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| Posted: Sat Jan 09, 2016 6:45 pm Post subject: |
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kansalliskala wrote:
I don't think lenses are a big problem.
But I would avoid the leather cases anyways. 
_________________
MF: Kodak DCS SLR/c; Samsung NX10; OM-10; Canon T50
Zuiko 28/3.5, Distagon 35/2.8; Yashica ML 50/2;
Zuiko 50/1.4; S-M-C 120/2.8; Zuiko 135/3.5; 200/5;
Tamron AD1 135/2.8, Soligor 180/3.5; Tamron AD1 300/5.6
Tamron zooms: 01A, Z-210
Yashicaflex C; Київ 4 + Юпитер 8, 11; Polaroid 100; Olympus XA; Yashica T3
Museum stuff: Certo-Phot; Tele-Edixon 135; Polaris 90-190; Asahi Bellows; Ixus IIs
Projects: Agfa Isolette III (no shutter), Canon AE-1D (no sensor),
Nikon D80 (dead), The "Peace Camera"
AF: Canon, Tokina, Sigma Video: JVC GZ-MG275E |
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PhantomLord
Joined: 08 Apr 2013
Posts: 476
Location: Szczecin, Poland
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| Posted: Sat Jan 09, 2016 7:45 pm Post subject: |
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PhantomLord wrote:
Well, it's... interesting problem, that I have never thought off  .
However in my opinion going with temp. down is safer for the lens and actually may kill the bugs. Putting lens into a freezer with -10C, or even less, should kill the buggers and the lens will be all right. Just remember to let it warm gradually after taking lens out because all the grease inside could be completely frozen and trying to operate the lens could go wrong.
I'm not a bug expert so maybe some of the bugs may preserve in hibernation or something when put into the freezer, but I'm sure it's possible to kill living creatures by freezing it one or several times.
However, I agree with the guys above, that there is seriously little chance of lens being infected with bug or something.
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Mateusz
No good story ever starts with drinking tea.
Flickr: http://www.flickr.com/photos/mateuszmolik/sets/ |
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visualopsins
Joined: 05 Mar 2009
Posts: 10543
Location: California
Expire: 2025-04-11
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| Posted: Sat Jan 09, 2016 10:20 pm Post subject: |
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visualopsins wrote:
Try the bug collector's method of murder: https://en.wikipedia.org/wiki/Killing_jar
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Cameras: Sony ILCE-7RM2, Spotmatics II, F, and ESII, Nikon P4
Lenses:
M42 Asahi Optical Co., Takumar 1:4 f=35mm, 1:2 f=58mm (Sonnar), 1:2.4 f=58mm (Heliar), 1:2.2 f=55mm (Gaussian), 1:2.8 f=105mm (Model I), 1:2.8/105 (Model II), 1:5.6/200, Tele-Takumar 1:5.6/200, 1:6.3/300, Macro-Takumar 1:4/50, Auto-Takumar 1:2.3 f=35, 1:1.8 f=55mm, 1:2.2 f=55mm, Super-TAKUMAR 1:3.5/28 (fat), 1:2/35 (Fat), 1:1.4/50 (8-element), Super-Multi-Coated Fisheye-TAKUMAR 1:4/17, Super-Multi-Coated TAKUMAR 1:4.5/20, 1:3.5/24, 1:3.5/28, 1:2/35, 1:3.5/35, 1:1.8/85, 1:1.9/85 1:2.8/105, 1:3.5/135, 1:2.5/135 (II), 1:4/150, 1:4/200, 1:4/300, 1:4.5/500, Super-Multi-Coated Macro-TAKUMAR 1:4/50, 1:4/100, Super-Multi-Coated Bellows-TAKUMAR 1:4/100, SMC TAKUMAR 1:1.4/50, 1:1.8/55
M42 Carl Zeiss Jena Flektogon 2.4/35
Contax Carl Zeiss Vario-Sonnar T* 28-70mm F3.5-4.5
Pentax K-mount SMC PENTAX ZOOM 1:3.5 35~105mm, SMC PENTAX ZOOM 1:4 45~125mm
Nikon Micro-NIKKOR-P-C Auto 1:3.5 f=55mm, NIKKOR-P Auto 105mm f/2.5 Pre-AI (Sonnar), Micro-NIKKOR 105mm 1:4 AI, NIKKOR AI-S 35-135mm f/3,5-4,5
Tamron SP 17mm f/3.5 (51B), Tamron SP 17mm f/3.5 (51BB), SP 500mm f/8 (55BB), SP 70-210mm f/3.5 (19AH)
Vivitar 100mm 1:2.8 MC 1:1 Macro Telephoto (Kiron)
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Gardener
Joined: 22 Sep 2013
Posts: 950
Location: USA
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| Posted: Mon Jan 11, 2016 3:43 am Post subject: |
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Gardener wrote:
Are you too paranoid? Absolutely. Look, I've bought untold hundreds of used lenses. Not once have I seen anything to crawl out it. Now, rice and flour - that I watch like a hawk. Well, not after I got a separate fridge for grains  |
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guardian
Joined: 18 Mar 2009
Posts: 1749
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| Posted: Mon Jan 11, 2016 1:31 pm Post subject: |
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guardian wrote:
I'm very much in accord with the thinking of the OP regarding likelihood of discovering undesirable living entities within lenses having unknowable provenance.
I have yet, however, to experience any sort of fungus crawling out of my lenses. I wish it would; life would be easier if it did. |
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