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Old Mar 13, 2011, 7:22 PM   #1
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Default Sony A900

How many A900 users out there?
Recently obtained one at a very good price and have been playing with it.
I may need one more lens for this megipixel monster.
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Old Mar 13, 2011, 8:20 PM   #2
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Your Sony 70-400 'G' and Tamron 28-75/2.8 should do well on your A900.
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Old Mar 13, 2011, 10:14 PM   #3
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Your Sony 70-400 'G' and Tamron 28-75/2.8 should do well on your A900.
They do indeed. They both produce some "WOW" shots on the FF camera.
I would love to find something similar to my A700/SAL18-250 combo for a walk around setup.
Thinking of the Sony 70-300mm G but wider, shorter, and lighter would be nice.

I have tried the 18-250mmDT lens on the A900 and it sets the camera automatically to a crop sensor size at approx. 12mp.
Some of these actually don't look to bad and I have the crop factor back to gives me 27-375mm range.
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Old Mar 13, 2011, 10:42 PM   #4
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Congrats on the A900. The only Sony dSLR model I own is the A700. But, I have used the full frame cameras with most of my lenses.

One thing you'll probably notice is that the A900 is less demanding on the lens quality needed for best results (as compared to your A700). Lenses that tend to be "so so" on the A700 really shine on the full frame cameras.

Focus accuracy is also very good (an understatement from what I've seen with them, probably because a lot of lenses are "tuned" for 35mm cameras). But, I would suggest upgrading it to the latest V2 firmware for better AF speed (as your A900 will probably feel a bit "sluggish" compared to your A700 without it if you're shooting in demanding conditions). Get it here:

http://support.sony-europe.com/dime/...AC&m=DSLR-A900
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Old Mar 14, 2011, 12:08 AM   #5
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Congrats on the A900. The only Sony dSLR model I own is the A700. But, I have used the full frame cameras with most of my lenses.

One thing you'll probably notice is that the A900 is less demanding on the lens quality needed for best results (as compared to your A700). Lenses that tend to be "so so" on the A700 really shine on the full frame cameras.

Focus accuracy is also very good (an understatement from what I've seen with them, probably because a lot of lenses are "tuned" for 35mm cameras). But, I would suggest upgrading it to the latest V2 firmware for better AF speed (as your A900 will probably feel a bit "sluggish" compared to your A700 without it if you're shooting in demanding conditions). Get it here:

http://support.sony-europe.com/dime/...AC&m=DSLR-A900
One of the first things I did was update the firmware based on articles I was following prior to purchase, so didn't get a chance to really compare the two versions.
I agree thus far with quality requirements. Seems as though every lens I have tried thus far produces some very nice results.The huge view finder and 25 mp to play with allows folks like me with somewhat limited talent to get some really nice pictures and it is very user friendly just like the A700.
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Old Mar 14, 2011, 6:23 AM   #6
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Quote:
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One thing you'll probably notice is that the A900 is less demanding on the lens quality needed for best results (as compared to your A700). Lenses that tend to be "so so" on the A700 really shine on the full frame cameras.
The A900 has a 24MP image sensor, which is a tremendous advantage.

It also has a 'Full Frame' image sensor, which is a handicap. It captures the portion of the image circle where most of the flaws appear, the portion of the image circle that is cropped off by an APS-C image sensor. An excellent lens will be excellent on an A900, but a lens that's not so good on an A700 will will be worse on an A900 for two reasons:
  1. That portion of the image circle that contains more flaws will be captured as part of the image, and
  2. The flaws will be preserved and presented at high resolution.
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Old Mar 14, 2011, 12:24 PM   #7
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Thanks for the replies and information.

Various reviews and even Sony say that the SAL18-250mm DT lens won't work on the FF A900.

I tried it and see no issues. It sets the camera to APS-C and I get the increased size to 27-375mm and reduces the mp to 12.
What am I missing here???

Also with the 70-400mm installed and setting the camera to APS-C I get 105-600mm and 12mp like I have on the A700.
Is this a bad thing?

Still kind of green on all of this stuff.

Thanks.
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Old Mar 14, 2011, 2:13 PM   #8
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Any DT (or DC or Di II lens) will work on the A900 (& A850), but if the camera identifies the lens as an APS-C lens, it will automatically switch to APS-C mode.

But while your A700 will record an image with a resolution of 4272 x 2848 pixels (12MP), the A900 (& A850), in APS-C Mode, will record an image with a resolution of only 3984 x 2656 (10.5MP). So an APS-C lens on an A900 will record a lower resolution image than the same lens on an A700.
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Old Mar 14, 2011, 3:18 PM   #9
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Any DT (or DC or Di II lens) will work on the A900 (& A850), but if the camera identifies the lens as an APS-C lens, it will automatically switch to APS-C mode.

But while your A700 will record an image with a resolution of 4272 x 2848 pixels (12MP), the A900 (& A850), in APS-C Mode, will record an image with a resolution of only 3984 x 2656 (10.5MP). So an APS-C lens on an A900 will record a lower resolution image than the same lens on an A700.
Thanks so much TCav, exactly the answer I needed and clarifies the lens issue.
You just ended my quest for the Sony 70-300G as a walk around lens.
It seems the 18-250 will serve my purposes well for a casual walk around without having to spend another bundle of cash.
I only print 4x6 and 8x10 photos so the 11.5 mp should be fine if I want to print one and for a special purpose photo (larger) I can use the 28-75 or 70-400.
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Old Mar 14, 2011, 5:09 PM   #10
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If you're going to stick with the 18-250, stick with the A700. It will give you the same angle of view, better resolution, and it's smaller and lighter.
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