From: David Tetzlaff (email suppressed)
Date: Wed Aug 18 2010 - 07:07:49 PDT
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
> 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
>
>
>
>
>
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> Alain LeTourneau
> Pam Minty
>
> 40 FRAMES
> Attention: Pam Minty
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