Photography / Camera chat thread.

[Bri w]

Originally Posted by TC3

Filipe that is some amazing technology! However it is obviously for specialist application but i wonder how well it works if the camera and subject are not perfectly still. The D7000 is only 4 mp more than my old D90 yet you need a steady hand as the extra mega pixels do show any slight camera shake you would otherwise might not see on the D90 at similar shutter speeds. They must have a brilliant kind of stabilization system.... did not read it all

This maybe why I'm seeing some blurry shots. I've been disapointed with some of my shots using the sort of shutter speeds I used to use. I'd pretty much decided to ramp up the SS just in case, and your post also goes some way to confirming that.

Originally Posted by Bri w

This maybe why I'm seeing some blurry shots. I've been disapointed with some of my shots using the sort of shutter speeds I used to use. I'd pretty much decided to ramp up the SS just in case, and your post also goes some way to confirming that.

Increased sensor resolution could (and will) be a factor for blurry shots, and your technique will be put to the test, but other possible causes might be:

- If you're using VR lenses, you have to make sure to allow them enough time to settle before taking the shot (1 sec is usually enough);

- Still related to VR lenses, some specialists say you should turn it off entirely when shooting faster than 1/500 s (this value is related to half the sampling frequency of the VR system while it's tracking your movement). If you go above the Nyquist frequency (half the sampling frequency), you will get aliasing errors that might actually do more harm than good.
VR works by decentering one lens element to counteract your motion. By definition, an off-center lens element will hurt your Image Quality; the reason why VR works is because it's always better to have a slightly degraded IQ than a completely blurry low light shot. In good light, this principle gets turned on his head, and if you have enough shutter speed, there's no reason to sacrifice IQ, especially if you're running the risk of the VR element being less than perfectly aligned due to a sampling error;

- High resolution sensors will also push some lenses past their limits, and the D7000 will put a lot of the otherwise very competent DX lenses to shame. The 18-105, which is perfectly decent on 10 - 12 MP bodies, will start showing it's limitations on a D7000... the 16-85 or 17-55 f/2.8 will be better matches.

[rictus01]

Sigma AF 17-70mm f/2.8-4.5 DC macro lens, anyone got one? views ?

looking for a replacement for a canon 18-85mm, I've the opportunity to pick one up for £120, I don't need a long lens, just a walkabout.

Cheers Mark.

Originally Posted by rictus01

Sigma AF 17-70mm f/2.8-4.5 DC macro lens, anyone got one? views ?

looking for a replacement for a canon 18-85mm, I've the opportunity to pick one up for £120, I don't need a long lens, just a walkabout.

Cheers Mark.

Yeah I tried 2 of them and was not very happy with either. Both had very poor sharpness in corners when used at 2.8 so I would check it out first real carefully.

[rictus01]

well I'm picking it up next week as it's from a mate and I get to borrow it for a week or so, I'll have a play with it and see how I get on.

but cheers for the feedback.

[pookie]

I was after opinions on a compact camera. I see a lot of references to the panasonic range.

I was looking at the tz20 / tz18 and the Canon IXUS 230 HS.

I like the larger zoom of the tz and the hd video recording is a bonus. Its probably the best pic quality in a reasonable package that I can slip into a pocket without crushing it. Budget is 150 - 200 are there others I should consider. Cheers

[dyzio]

Thinking of selling my 18-250MM F/3.5-6.3 DC OS HSM Canon lens.
2 years old, very good condition, no problems whatsoever. Complete with box and manual.

Looking for 200 + postage.

If anyone's interested, drop me a pm, it'll go on evilbay otherwise.

Ta.


Some pics taken with it are here (the crap ones are from a mobile):
http://forums.sv650.org/showthread.php?t=179986