[Leica] Quiz time....

[douglas.sharp at gmx.de (Douglas Sharp)]

B.D.
1) how come a round hole in a lens make a rectangular image on film
2) why isn't the image a lot brighter in the centre
3) why light regulation - what are the differences caused by aperture and 
shutter speed  variations, each alone or in combination
4) why do we use a lens or lenses when a simple pinhole will produce an image
5) if light is made up of different colours, each with a different 
wavelength,
how do we get them to converge at the same point
6) why is the effect of camera shake or vibration more critical for longer 
focal 
lengths
7) which way up and which way round is the image on film, and why.

regards
Douglas



B. D. Colen wrote:
> Okay, gang, let's give a quiz....
> The new semester starts for me tomorrow at 7 p.m., and I am planning to
> give a short, simple quiz - multiple choice - to get a sense of what my
> students do and don't know about the basics of photography - mechanics,
> not history or aesthetics.
> 
> I don't care if they've ever shot film, know anything about processing
> or printing. What I want to know is what they know about using a camera
> - digital or film.
> 
> I have plenty of questions, but I wonder what any of you would ask...
> 
> Thanks -
> B. D.
> 
> P.S. I don't care if they know which version of the pre-asph 50
> Summicron is considered the best by Erwin Puts, nor do I care, or could
> I ask, if they know what a NOOKY is...:-)
> 
> -----Original Message-----
> From: lug-bounces+bdcolen=earthlink.net@leica-users.org
> [mailto:lug-bounces+bdcolen=earthlink.net@leica-users.org] On Behalf Of
> Aaron Sandler
> Sent: Wednesday, February 02, 2005 2:59 PM
> To: Leica Users Group
> Subject: RE: CC filters (was: Re: [Leica] Re: LUG Digest, Vol 29, Issue
> 124)
> 
> 
> BD, you've reminded me of something I've been wondering:
> 
> Why do folks equate filters on a film camera to in-camera processing in
> a 
> digital camera?
> 
> It seems to me that with digital:
> Light enters lens, hits sensor, software in the camera corrects color
> 
> How is that different from:
> Light enters lens, hits film, film is scanned, software in computer (eg,
> 
> PS) corrects color
> 
> If a filter would help in the pre-light-hits-film phase, why wouldn't it
> 
> help in the pre-light-hits-sensor phase?
> 
> Inquiring minds want to know.
> 
> -Aaron
> 
> 
>>There are definitely times when PS offers the best, if not the only 
>>option for color correction. But keep in mind that making changes in 
>>Photoshop is rarely 'cost free,' in terms of the digital file. So if 
>>you can make the adjustments in camera if shooting digital, or with 
>>filters if shooting film, you're probably better off than routinely 
>>depending upon Photoshop.
> 
> 
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