Author Topic: A900 - Lens IQ Sample Images and Discussion  (Read 31820 times)

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Offline Simon [aka springtide]

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Re: A900 - Lens IQ Sample Images and Discussion
« Reply #90 on: February 10, 2009, 11:08:33 PM »

Thanks for posting Dom & Stef...  both look pretty good to me.   The 1:1 crops are something like 1.5m wide by 1m high with 75dpi 24MP files (screen resolution), so any softness & CA's will probably disapear even on A2 prints!
I have been very pleased with the results of the a900 + KM 17-35 - considering what the tests shots looked like.


I must admit, the longer I own the a900 the more I think that even 'average' lenses perform pretty well.

Obviously the higher end lenses will make the most of the a900, but you can get decent results on most FF lenses.  The only lens that hasn't really worked for me so far, was my Tamron 24-135 SP.  Great lens on the 7D, not so great on the a700, and terrible on the a900.  Might have been better stopped down a bit - but wasn't very fast to start with.

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Offline Stef.

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Re: A900 - Lens IQ Sample Images and Discussion
« Reply #91 on: February 11, 2009, 09:54:28 PM »
Some "real" life examples with the Sigma 15-30mm:

All shot @f8 and wide open @15mm:

View from my little son's room:


My little son's room:


Part of our kitchen:


This is shot @15mm and @f3.5:


So far I am pretty happy with the lens. Corner sharpness could be a bit better but than I will print an image A3 and will let you know the outcome. The more I think about it: one should really look at quality issues in print and not by pixel peeping on the computer screen. I work with four monitors on two computers simulatenously and can just say all my images look different on the different screens.
Sorry for the boring subject matter- at least you see parts of my house ;)
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« Last Edit: February 11, 2009, 11:08:57 PM by Stef. »
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Offline Rob aka [minolta mad]

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Re: A900 - Lens IQ Sample Images and Discussion
« Reply #92 on: February 12, 2009, 05:20:14 PM »
I like the "part of our kitchen" shot, how big is the rest of it.
The lens lokks pretty impresive though.


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Offline Stef.

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Re: A900 - Lens IQ Sample Images and Discussion
« Reply #93 on: February 12, 2009, 08:23:22 PM »
Rob- wide angle lenses make things look bigger than they are in real life ;) Also that's the beauty of living here in Canada: space does not cost much while in London every inch costs you a fortune! For what you pay in London for a flat you can get a mansion over here...
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Offline Bill

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Re: A900 - Lens IQ Sample Images and Discussion
« Reply #94 on: February 12, 2009, 11:16:06 PM »
Stef,

Really nice pics!  I could see picking up one of those if the price was right!

Bill
a77 + vertical control grip, a700 + vertical control grip,  24-70/2.8 SSM ZA,  70-200/2.8 SSM G,  HVL-F42AM flash

Offline Fixxxer

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Re: A900 - Lens IQ Sample Images and Discussion
« Reply #95 on: February 12, 2009, 11:19:26 PM »
Nice pics Stef. I'm intruiged as to how the sharp the corners will be in printing...

Offline dominicall

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Re: A900 - Lens IQ Sample Images and Discussion
« Reply #96 on: February 12, 2009, 11:44:40 PM »
Great pictures Stef. It looks very well corrected as well.

Dominic
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Offline Simon [aka springtide]

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Re: A900 - Lens IQ Sample Images and Discussion
« Reply #97 on: February 12, 2009, 11:45:13 PM »
Great set Stef, just shows how well even 'not so great' lenses look on the a900.  I must admit I'm pretty pleased with the KM 17-35 after using it properly.

You've got a good point about viewing at 1:1 and what images look in print.

I think someone pointed out that a typical screen has a resolution of around 75dpi meaning that 25MP a900 printed (like viewed at 1:1) would be:

6048 x 4032
= 80" x 54"  or metric  = 2m x 1.3m

Even at 100dpi (which is a pretty high dpi monitor) the a900 would still be printing:
6048 x 4032
= 60" x 40"  or metric  = 1.5m x 1m

I guess when we talk about sharpness when pixel peeping, IQ has got so good nowadays that printing at even fairly large sizes (A3 or A2) is no where near the same as pixel peeping.

I must admit, I'd love to have access to a A0 printer - just to see how images would look like with the a900+CZ85
« Last Edit: February 12, 2009, 11:47:14 PM by Simon [aka springtide] »
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Offline Stef.

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Re: A900 - Lens IQ Sample Images and Discussion
« Reply #98 on: February 13, 2009, 12:09:54 AM »
Stef,

Really nice pics!  I could see picking up one of those if the price was right!

Bill

Bill I was lucky as I swapped my Sigma 10-20mm for it. Considering that the 10-20mm is useless for the A900 it was a good swap. I can say from what I have see so far that I will not buy the CZ 16-35mm.................................yet ;)
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