Archived posting to the Leica Users Group, 2009/04/16

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Subject: [Leica] 28 Summicron and IR hotspot... on film
From: s.dimitrov at charter.net (Slobodan Dimitrov)
Date: Thu, 16 Apr 2009 08:32:36 -0700
References: <ee8fa51c0904160426v421eed02n36059619e73af28d@mail.gmail.com> <8f5413a60904160641m48b14d01k3814186648149351@mail.gmail.com> <DEF791BD-2728-4FB4-BD33-641E58B9849F@charter.net> <8f5413a60904160734q6ab4ad61h573813a1c3fda405@mail.gmail.com> <p06230908c60cfaecab90@[10.0.1.199]>

Most of us were shooting HIE with red filters. Which might of  
accounted for the hot spot. I did know someone who used to shot party  
scenes with the IR filter over the flash, and tape all around for  
light bleeds. Interesting stuff.
S.d.


On Apr 16, 2009, at 8:16 AM, Henning Wulff wrote:

> I've heard about it, but never experienced it myself. I've shot a  
> lot of HIE in M4's; in fact for many years I had one dedicated to  
> it. I once tried leaving an M4 with a Summicron wide open and no  
> filter pointed at the sky for a day. No fog.
>
> I have however experienced hot spots with some lenses.
>
> As for SLR's being popular for HIE, they're certainly exceedingly  
> clumsy, what with having to take off and re-install the filter for  
> every shot since you can't see or focus through them. Rangefinders  
> have always bee the better option.
>
>
>> Are you implying that it occurs before the exposure through the
>> shutter curtain? That's news to me...
>>
>> On Thu, Apr 16, 2009 at 10:20 AM, Slobodan Dimitrov
>> <s.dimitrov at charter.net> wrote:
>>>  It's prevalent to rangefinders, as they have no mirror to act as  
>>> a baffle.
>>>  That off course excludes the Nikon SP, of which the latter run  
>>> used a metal
>>>  shutter.
>>>  It's one reason why usage of HEI took off when the SLR came into  
>>> use. The
>>>  japanese SLRs that is.
>>>  A friend, back in the early 70's, converted an M4 to a metal  
>>> shutter curtain
>>>  for that very reason.
>>>  It wasn't cheap, even by the neolithic economics of that era.
>>>  S.d.
>>>
>>>
>>>  On Apr 16, 2009, at 6:41 AM, Tim Gray wrote:
>>>
>>>>  Well I've heard lots about hotspots on digital cameras but  
>>>> never on
>>>>  film.  Which was why I asked.
>>>>
>>>>  If you don't want that HIE, I might be interested :D
>>>>
>>>>  On Thu, Apr 16, 2009 at 7:26 AM, Marty Deveney  
>>>> <benedenia at gmail.com>
>>>>  wrote:
>>>>>
>>>>>  There is some useful anecdotal info from the M8 here:
>>>>>
>>>>> http://forum.getdpi.com/forum/showthread.php? 
>>>>> s=26793094e0d9c5042ed22f16ba1a86a8&t=257which
>>>>>  will apply equally to HIE or other very IR sensitive films.
>>>>>
>>>>>  I have used a lot of HIE in the past and still have a brick  
>>>>> frozen, but I
>>>>>  think I'll need to use it soon.
>>>>>
>>>>>  Marty
>
> -- 
>
>    *            Henning J. Wulff
>   /|\      Wulff Photography & Design
>  /###\   mailto:henningw at archiphoto.com
>  |[ ]|     http://www.archiphoto.com
>
> _______________________________________________
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In reply to: Message from benedenia at gmail.com (Marty Deveney) ([Leica] 28 Summicron and IR hotspot... on film)
Message from tgray at 125px.com (Tim Gray) ([Leica] 28 Summicron and IR hotspot... on film)
Message from s.dimitrov at charter.net (Slobodan Dimitrov) ([Leica] 28 Summicron and IR hotspot... on film)
Message from tgray at 125px.com (Tim Gray) ([Leica] 28 Summicron and IR hotspot... on film)
Message from henningw at archiphoto.com (Henning Wulff) ([Leica] 28 Summicron and IR hotspot... on film)