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can you use the lcd as the view source?
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Sandman
Forum Pro
no
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Shoot more, ***** less!
galleries at: http://www.pbase.com/sandman3
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Ribber
Leading Member
No live preview on the LCD with the 400D. Time to get used to the old-fashioned way of taking photos (viewfinder to the eye) 
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hopkinsg
Forum Enthusiast
No. With an SLR (Single lens reflex) camera, their is a mirror that reflects the image from the lens up into the viewfinder. The sensor does not see the image until you go to take the pic. The mirror then flips out of the way and the light then hits the image sensor itself to be recorded, and the mirror flips back down. "normal" / P&S cameras do not work like this. Their image is constantly being recorded by the sensor and do not work the same way.
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Gary H
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hopkinsg
Forum Enthusiast
No problem! This is also my first SLR, so I am in the learning process as well.
Gary H
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Gary H
Marshallj25
Active member
Actually, it depends on what SLR we're talking about. There is nothing inherent in the design of a SLR that prevents this, and in fact some do let you preview using the LCD.
As for the mirror, a camera maker could easily allow the camera to flip the mirror out of the way and use the main imaging chip to give realtime feedback to the LCD.
There is only one model doing that, AFAIK; and that doesnt seem to be doing well in the market for whatever reasons
The bigger problem is the sensor itself. Todays SLR sensors arent good enough to provide continuous capture and feedback without overheating and causing either noise due to this or maybe simply dying out. P&S sensors being small enough can take the load by virtue of their size and also by sacrificing quality (remember most of them produce quite bad results at higher ISO where heating effect is more prominent and are clipped for high ISO usage)
The same reason forbids SLR sensors being used for shooting video clips
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Doug Pardee
Veteran Member
That depends on how you count.
There is one currently-available basic live preview DSLR design. That design is used with some variations under three labels:
Olympus E-330
Panasonic Lumix DMC-L1
Leica DIGILUX 3 (not yet available?)
There are at least three past DSLR models with live preview:
Olympus E-10 (fixed-lens SLR with pellicle mirror, 2000)
Olympus E-20 (fixed-lens SLR with pellicle mirror, 2001)
Canon EOS 20Da (special modification for astrophotography, 2005)
And a number of Canon film SLRs:
Canon Pellix (pellicle mirror, 1965)
Canon Pellix QL (pellicle mirror, 1966)
Canon F-1 High-Speed Motor Drive Camera (pellicle mirror, 1972)
Canon New F-1 High-Speed Motor Drive Camera (pellicle mirror, 1984)
Canon EOS RT (pellicle mirror, 1989)
Canon EOS-1N RS (pellicle mirror, 1995)
Why film camera needs live preview??? Sounds like nonsense to me but I may be mistaken.
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imbsysop
Veteran Member
Which in turn would turn your precious CMOS sensor to ashes in no time ..
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It wasn't for live preview in the film cameras, but for the possibility of higher-speed shooting (or just non-interrupted viewing, in the case of the Pellix models). It cut out the viewfinder blackout as the mirror raised and then returned - and it's reasonable to assume that back in the sixties, at least, the mechanical processes governing the mirror lift might have been a shade slower than what's possible today, so it would have been seen as beneficial. The pellicle mirror was fragile though, and diverted quite a bit of light from the viewfinder image (and some from the actual exposure too).
strikeback03
Veteran Member
IIRC the 20Da only recommends using live preview in very low light situations. Did Canon alter the sensor any to accomodate the live view?
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why would a digital camera need a live preveiw? a camera is a camera. what's the difference? if you ask me, a digital SLR with a live viewfinder is just as much nonsense as a film SLR with a live viewfinder
ZeroTX
Leading Member
Not really, because a good live viewfinder gives you an exposure preview. Thus, if you are in full manual mode, you can actually make adjustments and physically see before-hand what affect this will have on the final result, before ever clicking the shutter. This is exactly how I used manual settings on my Konica Minolta DiMage A200. Especially useful for night shots to get an idea of what the results will be (e.g. look like night or simulated daylight, etc).
Also, when you half-press, the exposure is set... if the viewfinder is dark, you know you didn't expose correctly... release, and re-do it. No guesswork as to what the meter used to do the exposure.. it's right there in the EVF before you ever click the shutter.
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Doug Pardee
Veteran Member
That was poorly worded on my part. I was in a hurry and didn't recheck what I'd written. I had ripped out some unfinished stuff about the history and the various techniques used (second sensor, opening the mirror, and pellicle mirrors), and neglected to update everything for continuity.
Those film SLRs obviously didn't have live preview, but neither did they have to wait for mirrors to move in order to take a picture, and the viewfinders didn't black out when shooting. The pellicle mirror technology used in them was later used by Olympus in the E-10 and E-20 DSLRs.
None of these cameras—film or digital—has been a big seller (the Canon F-1 High Speed film cameras and the 20Da were designed as specialty items anyway). It would seem that the drawbacks involved have limited their acceptance.
modehead
Forum Enthusiast
At the end of the day its a proper camera.....not a P&S toy.
No live preview is fine by me. It means I wont be the one stood with my arms outstretched gazing into a little screen, then waiting an age for shutter lag....
No live preview is fine by me. It means I wont be the one stood with my arms outstretched gazing into a little screen, then waiting an age for shutter lag....
strikeback03
Veteran Member
that the question arose because obviously the film cameras were not exposing the film constantly the way a P&S exposes it's sensor, and even if it was it is of no use to the photographer, since they cannot see the result of the film.I was not aware that by live preview he meant that they maintained the viewfinder view while also exposing the film.
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