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PostPosted: Sat Sep 13, 2008 6:59 pm 
From PhotoClubAlpha article...
A good transcription of the announce.

The a900 OVF maybe is the best OVF ever made for a SLR and DSLR. Just has 0.02X less of different than 1Ds MIII.

"About our determination towards realising the highest performance viewfinder and how it was achieved: In the development of the Alpha 900 viewfinder our target was to achieve the best performance optical viewfinder. Our goal was to have the best performance viewfinder - to exceed the Dynax 9 which is considered to be the best viewfinder within over 20 years history of the Alpha mount SLR camera system - which started from Minolta 7000, the world’s first autofocus SLR.

We aimed for a viewfinder which exceeds all of the - professional - others currently in the market. To create the best performance viewfinder we realise these three points.

First - how to make framing accuracy. Framing performance is the most important function of a viewfinder. By adding an adjustment mechanism in the finder frame and adjusting the comparative position with image sensor in every single unit at the manufacturing line in the factory, precise 100 percent coverage was enabled.

Secondly - top class wide view. By designing an optimal shaped pentaprism from huge optical engineering data accumulation, and by using a high-power condenser lens (which uses high index glass), we succeeded to enlarge the magnification ratio and the view angle. By this we achieved top class wide viewing angle, and that’s including full-frame professional models.

The third point to achieve the best performance viewfinder is highest optical performance. By utilising a high power condenser lens, it firstly eliminates distortion and minimises aberration which affects sharpness in eyepiece lens optics. The distortion caused here is corrected perfectly with the high-powered condenser lens, thus achieving best optical performance.

Note: the condensor lens is sited immediately above the focus screen, between the screen and the prism. This was shown on another presentation slide.

The distortion is reduced to less than 20% of Dynax 9, which is virtually zero level. Also for comatic* aberration it is reduced to half from Dynax 9 which already had very low level. This means we have achieved a viewfinder with no distortion in the entire field. Even for optical brightness this tests better in comparison with Alpha 700, it shows with AR**-coating on every optical surface beyond viewfinder screen. It achieves extraordinary brightness compared with other top end models in the market.

*this is correctly transcribed and was shown on the screen - the aberration of coma
**anti-reflection

Alpha 900’s viewfinder with perfect framing capability, wide view, no distortion in the entire field and with extraordinarily bright optical performance – we are confident that amongst our own and other brand model ranges this is the ultimate viewfinder.

Apart from what I mentioned there are other integrated functions of the light-weight 850g Alpha 900, in spite of its high performance and the newly developed intelligent preview. Alpha 900 is deserved of the top passion of our engineers, including me, to develop Sony’s flagship model. I strongly appreciate your keen attention in the following workshops during the course of the day! Thank you very much for your attention."


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PostPosted: Sun Sep 14, 2008 1:12 pm 
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Sounds very promising Alex, thanks for sharing!
However, I'd like to get opinions from people who don't work for Sony. Let's hope Sony sends an A900 to Gordon soon...

- Bjorn -

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Last edited by Bjorn van Sinttruije on Sun Sep 14, 2008 1:32 pm, edited 1 time in total.

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PostPosted: Sun Sep 14, 2008 1:23 pm 
Bjorn van Sinttruije wrote:
Sounds very promising Alex, thanks for sharing!
However, I'd like to get opinions for people who don't work for Sony. Let's hope Sony sends an A900 to Gordon soon...

- Bjorn -


lol.


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PostPosted: Sun Sep 14, 2008 1:33 pm 
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For => From

:D

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Leica M9-P (my article on Camera Labs) | Leica D-Lux 5 | 50mm Summilux


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