How do you guys trades off Sharp-ness vs Noise

For awhile i've been thinking about this question. how do i trade off sweet spot vs noise for the best picture quality. Especially in a picture that DOF doesn't really matter. As most of the lens the "sweet spot" is about 1 stop from the wide open( i don't want to hear how such and such lens is super sharp at wide open neither.), sometimes, with the given shutter speed, should i step down and crank the iso up, for best picture quality. My general take is that as long as ISO is 800 or less, i'm will to trade for the sharpness and crank up the ISO, any personal opinion, or you guys experience on that?


I just want to hear how you guys would do in that situation, given that extra light is not available. I do day/night landscape/portrait indoor/outdoor.

If sharpness is absolutely key, I'll stay at the f/stop I want and bump the ISO if needed.

Modern cameras are rediculessly clean to very high ISOs so IMO, it's really a no brainer.

If the subject matter allows though, I'll grab a tripod and cable release as the first choice though.

You'll eventually learn to ignore the "sweet spot" and use the aperture, shutter speed, and ISO needed.

I never think about a lens 'sweet spot' when selecting aperture. DOF is my primary concern, and in low light I also start to worry about adequate shutter speed.

I have chosen lenses that work well wide open, and I don't worry about the difference between 'good enough' and 'really good' that I might get stopping down.

One other thing to keep in mind is that a lot of the time that you are riding the ragged edge between maximum aperture, high ISO and too slow of a shutter speed, lens aberrations are probably going to be the least of the effects softening your photos.

You are unlikely to notice the difference between wide open and stopped down on most lenses unless you are on a sturdy tripod or shooting at a shutter speed 2X to 3X the handholding rule of thumb.

Get a 5D mark II and then never worry about ISO again !

I am and probably will be continually amazed at the 5d classic ability to shoot higher ISO than I would think 'safe'. I use aperture to get what I want, ISO to make it possible to get a shutter speed I can hand hold or to get a fast enough speed for active subjects.
1-aperture
2-lowest ISO that gives me a shutterspeed I can hand hold
3-or higher yet to get me a fast enough shutter for a moving subject (1/125 or faster)

I have to wonder, how slow a lens is now fast enough to shoot basketball handheld with a 5dmkII set at ISO xxxxxxx? I mean, gee whiz, with a high enough ISO, who needs fast lenses? What happens if you just drill a pinhole in the body cap?

The same goes for me.. The current crop of DSLRs are incedibly clean when it comes to noise as opposed to film..

I used to shoot basketball with a Mamiya press camera: f4.5 (the maximum aperture), 1/250, Tri-X at 320 ASA. The hard part was follow-focusing with a double-image rangefinder. I compensated for the shutter speed by learning to shoot for the peak action...which is the most exciting action anyway.

With AI Servo focusing, f4.5 at 1/250 would be nearly cake. But at ISO 1600, gee, at 1/1000 and with AI Servo it would just be too easy.

cdifoto wrote in post #9057853
You'll eventually learn to ignore the "sweet spot" and use the aperture, shutter speed, and ISO needed.

x2

If a lens is really that soft wide open then you should probably have it serviced or sell it and buy something better.

Depending what you are shooting is more important for choosing DOF and ISO.

If I was shooting sports (someone running for example) I would rather crank up the ISO then to shoot at f/1.8 and miss the focus (due to narrow DOF).

Even the 50 1.8 is sharp wide open; it's just the autofocus that completely and utterly blows.

Thanks you guys! I've just got some good insight to what real photography is like from you guys. I guess knowing the "sweet spot" and being obsesses about it is two different stories, then. I guess being obsesses about it only will cause harm to my photography skills. I guess the true photography spirit is more so on the composition and the message conveyed more so than the absolute sharpness of a picture. right?

Karl Johnston wrote in post #9058063
Get a 5D mark II and then never worry about ISO again !

I played with my friends 5D2, the noise control is amazing. but i don't think i'll go FF yet, because i still want the reach from the crop for telephotos. The DOF is amazing though, but it's not my top piority yet. i don't think i'll upgrade until for another 2-3 years (although i've probably put somewhat 30,000 shots on my 500D already, so the time may come earlier), but i think the next body will still be a crop.
Now i'm still focusing on my lens set, i think i have amazing set to get stuff done. And all fit inside a small bag, so i'm very happy and content.

JeffreyG wrote in post #9057973
One other thing to keep in mind is that a lot of the time that you are riding the ragged edge between maximum aperture, high ISO and too slow of a shutter speed, lens aberrations are probably going to be the least of the effects softening your photos.

You are unlikely to notice the difference between wide open and stopped down on most lenses unless you are on a sturdy tripod or shooting at a shutter speed 2X to 3X the handholding rule of thumb.

Thanks, Jeffrey. I love your answer. Although i actually can tell the difference b/c i pixel peeps alot, but your answer make sense a lot.

1. Decide how big a house you want to build (Aperture)
2. Then, decide how many workers you need (More workers = Higher ISO = Higher noises)
3. The result will determine how long the project (photo) takes (Shutter speed)

Notes:
- Sometimes you want to build house slow because you want to ensure quality and make sure certain details are included.
- Sometimes you want to build house fast because you may only be allowed a very short period of time to finish it up

masayako wrote in post #9086439
1. Decide how big a house you want to build (Aperture)
2. Then, decide how many workers you need (More workers = Higher ISO = Higher noises)
3. The result will determine how long the project (photo) takes (Shutter speed)

Notes:
- Sometimes you want to build house slow because you want to ensure quality and make sure certain details are included.
- Sometimes you want to build house fast because you may only be allowed a very short period of time to finish it up

I wouldnt sugest this method.

The important items IMHO for any image are the aperture (size of DOF) and shutterspeed (motion blur or lack of).

Example - birds in flight (applies to cars/planes/people etc). Aperture fairly wide open for DOF reasons (say f4), SS 1/300 (to stop motion) - ISO wherever it need to be to allow the above settings. Please note the figures quoted are only to illustrate the concept.

You can PP noise out a damn sight easier (or less noticably) than you can with either motion blur or softness (due to focus or shooting wide open). Blur is very difficult to remove but noise reductions programmes (noise ninja, noiseware etc) are easy and quick with pretty good results.