[Frameworks] projector question

Tue Oct 12 17:23:52 CDT 2010

Hi Carl,
If after all of this time you are still curious the answer is simple: the 38mm on the Elmo is NOT wider than the ISCO when it is zoomed all of the way out.  I just thought it was and I also couldn't understand why this would be the case.  As it turned out, I was informed later that the Eiki with the ISCO lens was actually broken and now that it is fixed the lens zooms correctly thus solving the mystery for me.
CH

> Date: Wed, 18 Aug 2010 14:25:56 -0400
> From: carljlee at yahoo.com
> To: frameworks at jonasmekasfilms.com
> Subject: Re: [Frameworks] projector question
> 
> 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: info at 40frames.org <mailto:info at 40frames.org>
> >> To: frameworks at jonasmekasfilms.com 
> >> <mailto:frameworks at jonasmekasfilms.com>
> >> Subject: Re: [Frameworks] projector question
> >>
> >>
> >>
> >> On Tue, Aug 17, 2010 at 8:54 PM, Christopher 
> >> Harris <charris91 at hotmail.com <mailto:charris91 at hotmail.com>> 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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> >>
> >>
> >>
> >>
> >> -- 
> >> 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>
> >>
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