[rollei_list] Re: slide shows alive and well in Europe
- From: Laurence Cuffe <cuffe@xxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Fri, 06 Oct 2006 16:55:31 -0400
On Friday, October 06, 2006, at 03:48PM, Eric Goldstein <egoldste@xxxxxxxxx>
wrote:
>If you think about it, any enlarging lens that is long enough to give
>you the magnification you need will certainly cover...
>
>Eric Goldstein
Getting the coverage wouldn't be a problem, getting the speed/brightness
probably would be. Most long focal length enlarging or process lenses I've
found all have quite small F stops. When I get back to Ireland I should try out
my aero Ektar on the magic lantern and see how it does.
I'm not that convinced by digital/powerpoint. I remember one talk I gave where
I had a load of beautiful electron micrographs which I scanned and the put in a
powerpoint presentation. After putting about five of them up on the screen in
the talk, I apologized to my audience and skipped the rest, the displayed
quality was just so poor.
I ended up passing around the 8x10 prints I'd made to scan the images from,
which worked out o.k. Admittedly, part of the problem is cultural, we expect
the lights to be very dim for a slide presentation while for power point
presentations the expectation seems to be for much higher ambient light levels.
Thanks for the suggestions,
All the best
Larry
>
>On 10/6/06, David Dodge <dannysoar@xxxxxxx> wrote:
>> I'd have thought that the important number would be the coverage. I
>> can't imagine that 6x9 enlarging lenses are hard to find. I have a
>> friend who regularly enlarges 5x7's on an old 8x10 Saltzman (sp?)
>> enlarger.
>> David
>>
>>
>> Eric Goldstein wrote:
>>
>> > You could use an enlarging lens if you could find one long enough. You
>> > need a lot of magnification in projection. Typical speed of a
>> > projection lens if f/2.8 - f/3.5 (for zooms), which is in the ballpark
>> > for enlarging lenses. Getting a pright projected image from a
>> > transparency is always a challange.
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