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E-330 LiveView Modes (A and B) and *ist DL2 Digital Preview
I have some interesting thought on the innovative (and costy) design of
the Oly E-330 LiveView function and its two modes, LV A and B, also on the somehow innovative but without cost implication "Digital Preview" mode of the Pentax *ist DL2 (Pentax's engineers are clever to make stuff out of nothing (no cost implication) and I bet their financial controllers don't let them to spend more money..) 1. LiveView Mode A (i) Working Principle: Oly installed a 1/2.5" CCD in the viewfinder. LV Mode A use this CCD to capture the realtime image for framing. As the finder of the E-330's finder is only of 95% in frame coverage, the LV mode cannot exceed this coverage. In practice, it is smaller owing to it is impossible to align exactly for the component, thus the coverage is only 92%. (ii) Pros and Cons The pro is the image is the DSLR now can be operated as a prosumer DC but he cons as said including the smaller coverage plus the difficulty to capture liveview image in low light, owing to that much of the incoming light have gone to the AF mirror sub-path and then to the optical finder, especially consider that the Oly 4-3 system is of a 2X factor which have already gathered less light physically. (iii) My suggestion for possible engineering improvement in the design - The Oly engineer should use a 1/1.8" CCD to capture the LV image if possible - The viewfinder optics should be made to have larger coverage, say, 100%, thus the LV mode A image can be of 95%, for example. - Prisms should be used instead of mirrors as far as possible to minimize the loss of light for the complicated light pathS in the design of the E-330, i.e. to minimize/decrease the number of mirrors as far as possible. 2. Live View Mode B: (i) WOrking Principle To use the Live MOS 7.5M Panasonic imager to capture the image. The main mirror is locked up and the shutter is opened before LV mode B is entered. (ii) Pros and Cons Full frame coverage but AF is not working anymore. On the other hand, it is now without low light viewing difficulty because of the CMOS sensor receive ALL the light. However, ar killing disadvantage is that there is a shooting delay as the camera need to restore the standby status by lower the mirror, close the shutter, reset the CCD before the actual shot can be taken. (iii) My suggestion on the possibl engineering design improvement: The delay is owing to hardware limitation, main for the re-initialise lead/lag time for the Panasonic Live MOS imager, from the LV mode back to the Capture mode. Thus there is not much to do for the delay except Panasonic can improve the re-initialisation time. But for the AF problem. I have a simple thought: Why not incorporated the Contrast Detection AF of P&S DC into the camera after entering LiveView Mode B? I think it is very simple to do so.. 3. Digital Preview of the Pentax *ist DL2 (i) WOrking Principle: The camera just take the shoot, store the picture in the memory and let the user to "preview" the final shot (on pic composition, WB, focus, exposure etc.) (ii) Pros and Cons Pros is this feature is handy and useful and do not need to waste card space plus no need to delete images which are not needed. Also, it is somehow can be used as an aid for shooting when the user cannot view thro the optical finder - He just need to pull the preview finder to "take" the picture. But this is not LiveView afterall. (iii) Any possible improvement, then? Pentax should incorporate the LiveView mode B function as Oly does. But AFAIK, the Sony/Sanyo CCD it uses does not have this feature. Well, it's time for Pentax to find Panasonic then.. OR, Pentax should ask Samsung to clone the Pana design! LOL.. Also, PEntax only let the user to choose between optical DoF preview OR just Digital Preview in a custome function. Again, why not have the *choice* on BOTH? What is the conflict between the Optical DoF Preview against the Digital Preview? None, indeed. --- Well, I think I might have made a somehow lengthy technical talk here. But I think it would be interesting to see that some days later we can have better DSLRs with better LiveView and Digital Preview functions! My two cents, anyway.. RiceHigh http://www.geocities.com/ricehigh |
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