From: Carl Lee (email suppressed)
Date: Wed Aug 18 2010 - 11:25:56 PDT
I'm curious -- why would the 38mm on the Elmo be wider than the ISCO
35-65mm if it's zoomed out all the way?
Carl
David Tetzlaff wrote:
> On Aug 18, 2010, at 7:31 AM, Christopher Harris wrote:
>
>> Thanks Alain, I think you pretty much diagnosed the problem.
>
> It's not a problem. A 50mm is too long to get a decent image size in
> most classrooms and small auditoriums. Wider lenses for Elmo and Eiki
> are rare and expensive. You should be happy happy happy to have the 38mm.
>
> Still, there shouldn't be a dramatic difference between the brightness
> of the 38mm on the Elmo and the Eiki/ISCO zoomed out to the same image
> size. (You're also lucky to have that ISCO for your Eiki. Nice and
> bright compared to other options..._
>
> Are you sure the projectors both have 200W lamps?
>
> Does switching the lamps between the projectors make a difference?
> (It's possible the Elmo lamp could be weak, or something could be off
> with its DC power supply.)
>
> In any event, the 200W lamps for Eiki/Elmo are EJL, and you should
> lamp both of them up to a 250W ELC, which is the proper lamp anyway.
> Noticably brighter.
>
> (There are oddball low-end Eikis with 300W AC lamps, but those are
> dimmer than even the 200W DC ones, so I doubt you have one of those. I
> forget the model number difference, but you can recognize the AC lamp
> ones because they don't have a brightness switch inside the lamp housing.)
>
>
>>
>> CH
>>
>> ------------------------------------------------------------------------
>> Date: Tue, 17 Aug 2010 21:39:16 -0700
>> From: email suppressed>
>> To: email suppressed
>> <mailto:email suppressed>
>> Subject: Re: [Frameworks] projector question
>>
>>
>>
>> On Tue, Aug 17, 2010 at 8:54 PM, Christopher
>> Harris <email suppressed>> wrote:
>>
>> Hello all,
>>
>> I very recently bought an Elmo 16 CL DELUXE projector with a 38mm
>> lens and I noticed that compared to the Eiki owned by the
>> university where I teach the throw is much wider than the Eiki
>> with the ISCO 35-65 16MM zoom lens. Both projectors have 200W
>> bulbs so I suppose that the difference in brightness comes down
>> to the difference between the same lamp focused to a spotlight
>> versus flooded. Even with the Elmo switched to "high" brightness
>> its much dimmer than the Eiki.
>>
>> Any opinions? On or off list is fine by me.
>>
>>
>>
>>
>> The ISCO 35-65 is f1.3 while the Elmo 38mm (I believe) is f1.5. If
>> the image is wider on the Elmo and with the slight difference in
>> speed, you'll see a difference in brightness.
>>
>> Alain
>>
>>
>>
>>
>>
>>
>> _______________________________________________
>> FrameWorks mailing list
>> email suppressed
>> <mailto:email suppressed>
>> http://mailman-mail5.webfaction.com/listinfo/frameworks
>>
>>
>>
>>
>> --
>> 40 FRAMES
>> Alain LeTourneau
>> Pam Minty
>>
>> 40 FRAMES
>> Attention: Pam Minty
>> PO Box 15207
>> Portland, OR 97293
>> USA
>>
>> +1 503 231 6548
>> 40frames.org <http://40frames.org>
>> 16mmdirectory.org <http://16mmdirectory.org>
>>
>> _______________________________________________ FrameWorks mailing
>> list email suppressed
>> <mailto:email suppressed
>> _______________________________________________
>> FrameWorks mailing list
>> email suppressed>
>> http://mailman-mail5.webfaction.com/listinfo/frameworks
>
> ------------------------------------------------------------------------
>
> _______________________________________________
> FrameWorks mailing list
> email suppressed
> http://mailman-mail5.webfaction.com/listinfo/frameworks
>
_______________________________________________
FrameWorks mailing list
email suppressed
http://mailman-mail5.webfaction.com/listinfo/frameworks