I have a page on PBase with test images from my new Sony Alpha 900 DSLR. I try to produce these images with some care (pronounce as tripod and mirror lock up). The pictures are converted with LR 2.1 and posted as full resolution JPEG (95%). I'm just posting the results that I find interesting but feel free to ask for any specific information and I'll try to oblige if I can.http://www.pbase.com/ekr/a900_test
Findings this far (subject to revision):
1) Camera is OK, but I miss an L plate. RRS has now an L-plate, I have it on preorder (2008-12-14)
2) A2 prints from A900 are in the same league as from A700. On screen sharpness from A900 is significantly better than A700, but A700 seems good enough for A2. There is a visible advantage to A900 on A2 prints, but not a lot.
Preliminary lens evaluations:Updated 2008-12-21 with some observations on SAL 24-70/2.8 ZA, Minolta 80-200/2.8 APO, KM 28-75/2.8 and Minolta 50/1.4.SAL 24-70/2.8 ZA
I start to understand while Michael Reichmann likes this lens!
The bad news is that the lens is not really sharp in the extreme corners at 24 and 70 mm below f/11. The good news is that what is not in the extreme corners is spectacularly good.
Test images: http://www.pbase.com/ekr/2470za_test1
Minolta 80-200/2.8 APO
The lens I have is the original black version. Observations:
At 200 mm there is a lot of lateral chromatic aberration. It can be eliminated by and large with a chromatic aberration preset in lightroom. Once properly processed the image is very sharp. At 90 mm I didn't see any sign of lateral CA.KM 28-75/2.8
A series of test images will be posted later today on PBase. No other comments right now.Minolta 50/1.4
Not overly impressed by this lens. More useful as a portrait lens on the A700 (APS-C) than on full format, because of very soft corners.
A series of test images will be posted later today on PBase.
I have a few test shots with KM 28-75/2.8 and Minolta 20/2.8 this far, i don't have a complete evaluation yet. Primary findings are:
Very sharp across the field at 50 and 75 mm at f/2.8. Possibly some softness along the extreme edges (to be invistigated) at 75 mm.
I have an Sony SAL 24-70/2.8 ZA on order, scheduled delivery is end of Feb. 2008 (ouch). The 28-75/2.8 is a fine lens but will probably replaced by the 24-70/2.8.
Very sharp across the field at f/8.0. Quite soft and serious vignetting at f/2.8.I would say that this lens is a great positive surprise!
My past experience with the same lens in the "film days" was not so overhelming, and I also think that the original Photodo tests were not that impressive (Grade 3.5).
I checked back on the Photodo site for the MTFs ( http://old.photodo.com/nav/prodindex.html
) and they are quite interesting. At aperture f/8 sagittal MTF is very high except extreme corners. Tangential MTF is less impressive.
Minolta 100/2.8 Macro (original version with metal focusing ring)
Sharp at center from f/5.6 to f/11, nominal. Not tested beyond f/11. Possible issues with not entirely flat test target possibly not perpendicular to camera.
Images uploaded to: http://www.pbase.com/ekr/km_10028_macro
For latter evaluation:
80-200/2.8 APO (Minolta black)
400/4.5 APO (Minolta)