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Old Nov 2, 2003, 10:46 PM   #1
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Default What is Digital SLR?

What is Digital SLR? What features which make it one?
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Old Nov 2, 2003, 10:56 PM   #2
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Remember those big single lens reflex cameras you see professionals use? They're always bending their bodies to get a shot by looking directly through the lense with one eye squinting shut and one eye open composing the shot. DSLR's are the digital equivilant. You can't compose with the LCD screen, you have to look through the viewfinder which looks through the lens. There's a lot more to say but maybe this is what you were looking for.
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Old Nov 3, 2003, 12:02 AM   #3
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Can I say that digicam which uses TTL is Digital SLR?
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Old Nov 3, 2003, 12:32 AM   #4
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NO!!!

TTL just means Through The Lens, and it can refer to the flash or the viewfinder. In the case of most consumer digicams with TTL viewfinders, they use an EVF or Electronic ViewFinder.

To be a true dSLR it has to have exchangeable lenses, an optical TTL viewfinder, just like a film SLR camera.

This is a dSLR:
http://www.steves-digicams.com/2003_reviews/e1.html

This only looks like a dSLR, but has an EVF:
http://www.steves-digicams.com/2003_reviews/a1.html
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Old Nov 3, 2003, 7:10 AM   #5
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Quote:
Originally Posted by Mike_PEAT
To be a true dSLR it has to have exchangeable lenses, an optical TTL viewfinder, just like a film SLR camera.
Doesn't it need a rotating mirror as well? The "R" stands for "Reflex". Or are ALL cameras with exchangeable lenses SLRs?
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Old Nov 3, 2003, 7:40 AM   #6
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That's a good point I should have mentioned...check out this page on the subject:
http://entertainment.howstuffworks.com/camera7.htm

In the first diagram on that page you can see that the mirror would have to flip up to expose the film.

Some dSLRs and modern SLRs use a beam splitter instead to direct the image to multiple places (viewfinder and CCD) at once, so these don't use a flip-up mirror. Check out this picture of a cutaway Olympus E-10 which points out the beam splitter:
http://www.imaging-resource.com/PRODS/E10/ZCUTAWAY1.JPG

BTW, with cameras that use a beam splitter if you use a polarizer you HAVE to use a circular polarizer (linear polarizers don't work with them properly).
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Old Nov 3, 2003, 7:57 AM   #7
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Quote:
Doesn't it need a rotating mirror as well? The "R" stands for "Reflex". Or are ALL cameras with exchangeable lenses SLRs?
The Canon EOS 630'RT' - RT is for Real Time and has a fixed semi transparent pellicule mirror. This camera did not blackout the optical viewfinder when you shoot and also quicker between shots since there was no reflex action!
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Old Nov 3, 2003, 8:13 AM   #8
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No *mechanical* reflex action...it still a reflex action according to the dictionary:

"Bent, turned, or thrown back; reflected."
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Old Nov 3, 2003, 9:30 AM   #9
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OK...

Single Lens as in one lens not two (or more) as in Range Finder cameras... Remember Contax, Hasselbald, Leica or Mamya still make interchangeable lenses Range Finder cameras?

As to the Reflex where does it says it has to be 'optical'? So technically an EVF based camera can loosely defined as "semi-SLR", theses cameras just bend the light by electronic means (not only it's lighter, but integrate more features in them as well)! :lol: :lol: :lol:
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Old Nov 3, 2003, 11:50 AM   #10
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This reminds me of a thread in another part of this forum. Ah, here it is:
http://www.stevesforums.com/phpBB2/v...&highlight=zlr

I don't believe that technically a "SLR" (be it with a D or not) has to have interchangeable lenses. The vast majority do (if not all, but "all" is a strong word), but technically I don't see why you couldn't make a camera that fit the definition of "single lens reflex" where the lens was fixed.

In that thread someone used the term "ZLR", which they defined as:
"noninterchangable zoom reflex"

Sounds a bit like marketing speak to me.... A good definiton of SLR for the vast majority of people would be:
A camera where you look though an eye piece, and you see out the lens and the lenses are replaceable.

It might not technically be correct, but as a generalization it's easily good enough.

Eric
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