Ckw From UK - England, joined Aug 2010, 530 posts, RR: 18 Reply 1, posted (10 years 10 months 2 weeks 6 days 5 hours ago) and read 3953 times:
OK, an interesting comparison, but a few points people should note
1 - what you see is not grain, but noise - it looks similar but is quite different. In general though both get more noticeable as ISO increases.
2 - Although in general higher ISO means lesser quality, there is no direct correlation across cameras or films. For instance, Fuji Provia 400 has significantly less visible grain than Fuji Sensia 200. Different digital camera sensors also have different characteristics.
With digital images the "quality" of the noise is important - ideally it should be very random. Noise becomes much more noticable at low ISOs if it forms a regular pattern.
Airhead711 From United States of America, joined Mar 2002, 249 posts, RR: 3 Reply 2, posted (10 years 10 months 2 weeks 6 days 4 hours ago) and read 3928 times:
Thanks for the info.Very informative post and exactly the type of info I come to these boards to find.1 quick question though.What type of situation would require the ISO to be set to 400 or 800?I thought that low light situations required a higher ISO.But a couple of months ago at an airshow I took a photo of a B-1 Bomber doing a low pass with full burners at night.I had the ISO set to 400 and the photo was extremely grainy(or noisy...it's digital)But I am just a beginner so it's trial and error for me.So,can you explain a little about the situations that would require a higher ISO?
PPGMD From United States of America, joined Sep 2001, 2453 posts, RR: 0 Reply 3, posted (10 years 10 months 2 weeks 6 days 3 hours ago) and read 3929 times:
Well I have used 400 and 800 myself on my CP995. I was sort of forced to, it was dark and there was alot of movement. The 400s weren't bad, but the 800s were horrible, but still came out pretty good IMO.
Though on my cameras when shooting the 200 f2.8, with Press 400 or Press 800 the grain isn't that bad IMO, and the shutter speeds are at exactly what I am looking for.
Ckw From UK - England, joined Aug 2010, 530 posts, RR: 18 Reply 4, posted (10 years 10 months 2 weeks 5 days 18 hours ago) and read 3894 times:
Regardless of the ISO, grain or noise will be made worse by underexposure, so it is important to select an appropriate ISO for the conditions. I think, for example, instead of working at the margins of ISO 100 and risking a half stop underexposure, you would get better results with a correctly exposed shot at ISO 200.
Also, going back to my earlier comment, not all digital cameras are alike, and will have different noise characteristics depending on the sensor. Only experimentation and experience will tell you what's best for your camera - but since you're digital, at least you can experiment to your heart's content at no cost!
Craigy From United Kingdom, joined Jun 2001, 1118 posts, RR: 0 Reply 8, posted (10 years 10 months 2 weeks 1 day 5 hours ago) and read 3771 times:
I don't think Provia is an 'anomaly'. It is branded as professional slide film, and costs about twice the price of Sensia. I use Provia 100 and when scanned at 4000 dpi, I cannot see any grain at all. I have just used my first Provia 400 and I am waiting to see the results. It is a luxury shooting 400 ISO, being able to use such small apertures and fast shutters even at 500mm.