![]() ![]() But relative to full frame, the finders are already smaller. This is how it was always done with 35mm full frame models. All these cameras show a nominal 95% of the image area, and the magnification is expressed in terms of a 50mm lens. By making the path to the live view CCD folded, Sony has retained a normal looking external style.Īfter all, what is 0.74X? Canon’s EOS 450D is 0.87X but has a 1.6X sensor in place of 1.5X, which means it’s the same as 0.81X in Sony terms (actually, a smaller finder than the Alpha 200, though the specifications would imply it is larger – not many reviewers bother to consider that the Canon uses a smaller image area). They also want a small camera, without too much evidence of functional parts interfering with overall portability and neat style. They expect to find a DSLR able to do the same. All come from a background experience where the live view composition on a screen is the only thing they know. They have already stated they want to capture the digicam upgrading market, younger users and female users. ![]() With a larger ocular, a more distant eyepoint could be been maintained without loss of magnification, which depends mainly on the eyepiece design not the prism itself.Įxternal dimensions are important to Sony. I think that a direct path using an extended eyepiece, taking your eye further from the camera back as in the Nikon D3, could have been possible. Placing the CCD at a right angle like this, rather than in a large eyepiece surround, has forced a reduction in viewfinder magnification to 0.74X in place of the 0.83X of the Alpha 200. The system is just like having a built-in Zigview with a rather better screen. If it does become misaligned due to shock or wear, the live view image might be slightly defocused or wrongly centered, but again, this would have no impact on autofocus or image quality. All it will affect will be fine adjustment of the viewfinder dioptre control. The part of the porroprism which moves, at the front, is exactly the same as a normal prism face when in its optical viewing position.Īlthough this is a moving part and subject to alignment and collimation during assembly, any error in position will have no effect at all on image quality. The CCD is equipped with a lens of its own, as well as the 45 degree prism for reflecting the light to keep the optical path long enough. The Sony PR diagram does not tell the full story. I’ll explain here exactly what the implications are, and why a future model – let’s call it the A500 – offering the 14.2 megapixel sensor without the live view may be worth waiting for. NOT everyone will want the live view offered by the A300 and A350 – it does turn out to be more or less as we suggested, a secondary optical path adjacent to the eyepiece inside the prism housing. ![]()
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