Archived posting to the Leica Users Group, 2006/06/11

[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]

Subject: [Leica] Just back from India, question about burning hole in shutter
From: philippe.orlent at pandora.be (Philippe Orlent)
Date: Sun Jun 11 09:12:35 2006
References: <000c01c68d41$73a9b410$c310822f@corp.nortel.com> <448C12F3.2000908@waltjohnson.com> <FBE07261-CFAE-460D-BF66-EA7B37E98013@pandora.be> <448C3D2F.30302@waltjohnson.com>

Weren't you saying then -contrary to me- that the smaller the lens  
opening was, the higher the risk?
If not, then I misinterpreted you from the start.


Op 11-jun-06, om 17:56 heeft Walt Johnson het volgende geschreven:

> It seems simple....light=heat....less light=less heat....f16 is  
> less light (heat) than f1.5...Voila..Elementary my Dear Philippe :-P
>
> Philippe Orlent wrote:
>
>> Damn Walt, you got me thinking and testing.
>> Took a Summarit and burned within 1 sec a hole in a newspaper page  
>> at  f 1.5.
>> The distance was about the one to focal plane.
>> Did it again at f 16. A smaller circle on the newspapern but no   
>> burning even at 10 secs.
>> I also think I know why. Do you?
>> ;-)
>>
>>
>> Op 11-jun-06, om 14:56 heeft Walt Johnson het volgende geschreven:
>>
>>> Vick
>>>
>>> Simply take the lens off and outside to find the solution to  
>>> your  question. Focus the sun on your arm  stopped down and wide  
>>> open and  prove to yourself which is more likely to burn the  
>>> shutter curtain.
>>>
>>> Walt
>>>
>>> Vick Ko wrote:
>>>
>>>> I am just back from a very interesting trip to Bangalore (too  
>>>> few  days, but
>>>> in a way, just enough days).  Interesting to see the thread on the
>>>> temples...hmm.
>>>>
>>>> I was visiting my workteam, and a bit of sightseeing.  The  
>>>> camera  on my trip
>>>> was a Leica CL.
>>>>
>>>> One question, on one day, my workteam took me out to  play  
>>>> cricket  and when
>>>> it was "team photo" time, one of the guys took our cameras  
>>>> (there  were 2 of
>>>> us), stood back and took our photos.  My camera was at f16, and  
>>>> I  noticed
>>>> that he put it face up on the ground.
>>>> I had thoughts of horror as I worried about the sun burning a  
>>>> hole  into the
>>>> shutter.  I did notice that he wound the film on, so I think at   
>>>> least there
>>>> was a chance of the sun, coming in at f16, hitting the meter.
>>>>
>>>> So my LUG questions:
>>>>
>>>> 1. can the sun at f16 burn a hole?  I'm not wanting to try the   
>>>> experiment
>>>>
>>>> 2.  can the sun at f16 hurt my CL meter?  It seems fine.  I   
>>>> suspect the sun
>>>> is not at its focal point for the meter face
>>>>
>>>> I did notice a discoloured patch that is off to the edge of the   
>>>> shutter, 1/4
>>>> of the way to the edge.  It doesn't look like the sun "melted"  
>>>> the  rubber
>>>> there, maybe it was there always.
>>>>
>>>> Thanks in advance.
>>>>
>>>> Regards,
>>>>
>>>> Vick Ko
>>>>
>>>> ------------------------------------------------------------------- 
>>>> -- ---
>>>>
>>>>
>>>> _______________________________________________
>>>> Leica Users Group.
>>>> See http://leica-users.org/mailman/listinfo/lug for more  
>>>> information
>>>>
>>>
>>> _______________________________________________
>>> Leica Users Group.
>>> See http://leica-users.org/mailman/listinfo/lug for more information
>>>
>>
>>
>> _______________________________________________
>> Leica Users Group.
>> See http://leica-users.org/mailman/listinfo/lug for more information
>>
>>
>
>
> _______________________________________________
> Leica Users Group.
> See http://leica-users.org/mailman/listinfo/lug for more information
>


Replies: Reply from walt at waltjohnson.com (Walt Johnson) ([Leica] Just back from India, question about burning hole in shutter)
In reply to: Message from vick.ko at sympatico.ca (Vick Ko) ([Leica] Just back from India, question about burning hole in shutter)
Message from walt at waltjohnson.com (Walt Johnson) ([Leica] Just back from India, question about burning hole in shutter)
Message from philippe.orlent at pandora.be (Philippe Orlent) ([Leica] Just back from India, question about burning hole in shutter)
Message from walt at waltjohnson.com (Walt Johnson) ([Leica] Just back from India, question about burning hole in shutter)