09-24-2010, 03:58 PM
(This post was last modified: 09-24-2010, 04:00 PM by Brightcolours.)
[quote name='anyscreenamewilldo' timestamp='1285337294' post='3203']
whoops - i've just seen this and you've dropped a spanner in the works Lomskij - my main concern is about sharpness, the bokeh on the 7D looked nice (or has my perception been spoiled by my reflex lens?) -
ok, it's back to the shop to recheck the canon version of this lens - i've been studying up on setting the canon the way i want it - does anyone else think the canon menu a tad confusing? - but i suppose it's what is familiar that makes sense . . . maybe a bit like my posts? -
thanks Lomskij
[/quote]
Don't let one bad sample make you have a wrong perception of a lens.
Now, there is something I do not understand. You talk about returning a lens. You talk about selling it to nigerians (what would the postage be??).
You talk about a D200 test, AND you talk about trying it on an EOS 7D.
All that seems so jumbled indeed.
Is it correct to presume you do not have the lens for your A900? And that you maybe ordered it to fill a hole in your lens collection for your A900? And that you tried it on a 7D in some store, and are not sure about the sharpness?
You are aware that digital cameras have an AA-filter, and that the AA-filter is there to prevent false detail and odd colour patterns and aliasing? Not all cameras have the same strength of AA-filter. A stronger A-filter is not bad, as usually you do not lose more real detail.. AA-filter "softness" can be sharpened up really well.
I am assuming that you pixel peeped, and that you noticed a difference in per pixel apparent sharpness between what you are used to from your camera, and the few images you took with the 7D + 100-300 combination.
We can not make any sensible comment on that, since we do not have 100% crops to see what you are/were seeing. We can not see if it is normal AA-filter softness, we can not compare it against another lens on that 7D either, we can not see if the lens is a poor sample or not. Basically, we can't say much except that the Sigma 100-300mm f4 is a lens that has been a top lens for 10 years or more, a really good design.
It should do really well on a full frame camera (unless it is a sample with a problem, obviously), so also on your A900.
About the D200 and A900 pixel density...
The A900 has 6048 pixels horizontally, the D200 has 3872 pixels horizontally.
6048 / 35.9mm = 168.5 pixels per mm.
3872 / 23.6mm = 164 pixels per mm.
As you can see, they are very, very close.
Your D2x has a higher pixel density than your A900:
4288 / 23.7 = 181 pixels per mm.
The EOS 7D: 5184 / 22.3mm = 232.5 pixels per mm.
whoops - i've just seen this and you've dropped a spanner in the works Lomskij - my main concern is about sharpness, the bokeh on the 7D looked nice (or has my perception been spoiled by my reflex lens?) -
ok, it's back to the shop to recheck the canon version of this lens - i've been studying up on setting the canon the way i want it - does anyone else think the canon menu a tad confusing? - but i suppose it's what is familiar that makes sense . . . maybe a bit like my posts? -
thanks Lomskij
[/quote]
Don't let one bad sample make you have a wrong perception of a lens.
Now, there is something I do not understand. You talk about returning a lens. You talk about selling it to nigerians (what would the postage be??).
You talk about a D200 test, AND you talk about trying it on an EOS 7D.
All that seems so jumbled indeed.
Is it correct to presume you do not have the lens for your A900? And that you maybe ordered it to fill a hole in your lens collection for your A900? And that you tried it on a 7D in some store, and are not sure about the sharpness?
You are aware that digital cameras have an AA-filter, and that the AA-filter is there to prevent false detail and odd colour patterns and aliasing? Not all cameras have the same strength of AA-filter. A stronger A-filter is not bad, as usually you do not lose more real detail.. AA-filter "softness" can be sharpened up really well.
I am assuming that you pixel peeped, and that you noticed a difference in per pixel apparent sharpness between what you are used to from your camera, and the few images you took with the 7D + 100-300 combination.
We can not make any sensible comment on that, since we do not have 100% crops to see what you are/were seeing. We can not see if it is normal AA-filter softness, we can not compare it against another lens on that 7D either, we can not see if the lens is a poor sample or not. Basically, we can't say much except that the Sigma 100-300mm f4 is a lens that has been a top lens for 10 years or more, a really good design.
It should do really well on a full frame camera (unless it is a sample with a problem, obviously), so also on your A900.
About the D200 and A900 pixel density...
The A900 has 6048 pixels horizontally, the D200 has 3872 pixels horizontally.
6048 / 35.9mm = 168.5 pixels per mm.
3872 / 23.6mm = 164 pixels per mm.
As you can see, they are very, very close.
Your D2x has a higher pixel density than your A900:
4288 / 23.7 = 181 pixels per mm.
The EOS 7D: 5184 / 22.3mm = 232.5 pixels per mm.