14 hours ago
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Re: The reason for that...
In reply to cyainparadise,
5 months ago
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cyainparadise wrote:
Steve West wrote:
The clearance in the diagrams is suspect. I recall flipping it out on the A77 and noticing that the lens mount doesn't let the mirror flip completely out of the light beam. Seems you would have to change the lens mount internal structural flange to do this.
The reason "that the lens mount doesn't let the mirror flip completely out of the light beam" in the current DSLT bodies, is due to the fact that the mirror in them is not mounted at 45 degrees, unlike the flipping mirror in a traditional SLR using an OVF. The focusing sensor in a DSLT is further forward in the body which necessitates the need for a longer mirror.
True, the SLT mirror isn't mounted at a 45-degree angle -- it's mounted a bit more vertical than that, to divert light to the forward-mounted AF module. But that actually makes the mirror shorter, not longer (than it would have to be if mounted at 45 degrees).
The reason the SLT mirror assembly is bigger than a traditional SLR mirror is -- as the first poster who replied to you stated -- the presence of the external frame that holds this very thin mirror in place. And, of course, the fact that the mirror itself has to cover more area than an SLR mirror, to accommodate the movement of the image sensor when the in-body image stabilization is in use.
Greg
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