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Thanks Scott - if you PM me your email address, I will fire the RAW over for you to have a play with.
Cheers, Mark
Cheers, Mark
well if its raw and you have done no sharpening then thats your answer,
Learnt something new today, didn't know that raw files were soft.
one thing to remember here to is the 18-200mm is wide open and the 105mm is stopped down and will produce much better pics, try stopping down the 18-200mm
as for the 18-200mm shot, it does look a little smeary almost like slight movement.
what even when shooting raw(please explain)Well... I've said this before... I just can't see this as a sharpening (or not) issue as the shots are just too far out.
To me this has to be one of three things...
1. Really bad technique, like using all focus points and recomposing or much too low a shutter speed... but I don't think this is the case.
2. A duff lens.
3. A duff camera.
The way forward is surely to try a different lens or a different camera.
I hope you get is sorted but a superzoom should be capable of much better than this even before we get into the whole sharpening debate.
After looking at the above I'm still not impressed, shots should be sharper than this. Camera?????
Mark
If the 105Micro wasn't sharper, I would be wanting my money back on that. It is a prime lens, stopped down a bit. From the tests above, it is also showing only 80%ish of the image from the 18-200.
There realy is no comparison. The only thing you will do is convince yourself the 18-200 is crap, when it is just a bit of a compromise between carrying 2 or 3 lenses or 1.
I had a Sigma 18-200 OS and the results were similar to yours. Prety good if processed and no pixel peeping.
mark the 105mm is a prime lens also its a macro and will produce awsome images close up like it has.
Also, Woof Woof, you mentioned that both sets of images did not look as sharp as you were expecting - so, do you think I have an unsharp lens, and an issue with the D90 also? Cannot check with the D700, as that's at work at present, to see how it resolves the 105Micro as a comparison.
mark, my ones sweet spot is f10 i use mine for studio work,Noted and understood - that's why I bought it!
Do you not feel that there should be an improvement going from f5.6 to f8 on the 18-200mm though? There does not appear to be any improvement however.
Agree with your earlier post regarding the crops not being "real world" - point taken, but should not the point of focus on the lens actually be in focus - especially at f8, as in the last examples?
If I am considered to be barking mad, please feel free to say so!
mark, my ones sweet spot is f10 i use mine for studio work,
i think the only wa to be sure is test another one, f8 doesnt look much different, also looks like it suffers from vinetting(which is weired)
Agree, the vignetting is very odd, and all the more pronounced when shooting a page from a book! Hmm...
50mm and f11 should be about the best compromise between center/edge sharpness.Will also have a further play later today, to see if I can find the sweet spot on it.
Now, my next question - should a commercial lens, aimed at "one for all" use, have such a limited sweet point?
It appears "they all do that Sir" over 100mm and small f-numbers
50mm and f11 should be about the best compromise between center/edge sharpness.
Worst point is probably 135mm, so you were not too far off this with your earlier tests at 105mm. You rotter, comparing it to a lens in the prime of its life!
Well... it is called a sweet spot...
Nice set of pictures though, clearly show diffraction setting in at higher f numbers.
100% Crop...
This looks to me like camera shake. I can't really nail why I think it looks like that but that'd be what I said was up with it.
Think you said these shots were at 170mm, is that 35mm equiv or where the lens actually was, because if the lens was at 170mm then on a crop sensor you'd want a shutter speed of at least 1/272 ie 1/300 to maintain a sharp image, think you said you shot at 1/200th.
have you tried your focus tests with liveview to see if that makes a difference?
That might show up if you're having body focus issues.
Nick