Archived posting to the Leica Users Group, 2009/04/15

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Subject: [Leica] 28 Summicron and IR hotspot... on film
From: tgray at 125px.com (Tim Gray)
Date: Wed, 15 Apr 2009 18:00:22 -0400
References: <8f5413a60904150646i1450cd36ne150958ccf03f8c9@mail.gmail.com> <A44964CD-81D7-490F-861A-927B4BE40D99@verizon.net> <D7ECA676-6A7A-41F2-A07B-CC7257935EBB@charter.net>

Hmm.  That's interesting.  I've seen very little about hotspots on IR
film, but I guess it does happen.  Oh well.  Time to look for a 39mm
IR filter - I'll just shoot with the CV 28/3.5, which had better NOT
have a hotspot :)

Not that it's that interesting to most since they no long make HIE,
but I'll going to run a test soon with the lenses I have to see which
leave a hotspot on film, at what apertures.  I'll also try to get a
handle on the focus shift...

On Wed, Apr 15, 2009 at 4:54 PM, Slobodan Dimitrov
<s.dimitrov at charter.net> wrote:
> I've also had a hot spot with a 35mm.
> S.d.
>
> On Apr 15, 2009, at 1:29 PM, Leonard Taupier wrote:
>
>> Tim,
>>
>> The 28mm Summicron is known to give hotspots when shooting IR, film or
>> digital.
>>
>> Len
>>
>>
>> On Apr 15, 2009, at 9:46 AM, Tim Gray wrote:
>>
>>> So I shot some HIE the other week, and to my surprise, a lot of the
>>> frames have an IR hotspot in the middle of the frame. I've heard this
>>> happens with digital and some lenses, but had never heard of it
>>> happening with film. ?I was using my 28 Summicron with an R72 filter.
>>> ?Anybody else have this occur while shooting film?
>>>
>>> _______________________________________________
>>> Leica Users Group.
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>>
>>
>> _______________________________________________
>> Leica Users Group.
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>
>
> _______________________________________________
> Leica Users Group.
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>


Replies: Reply from imagist3 at mac.com (George Lottermoser) ([Leica] 28 Summicron and IR hotspot... on film)
In reply to: Message from tgray at protozoic.com (Tim Gray) ([Leica] 28 Summicron and IR hotspot... on film)
Message from len-001 at verizon.net (Leonard Taupier) ([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)