#5d mark iii vs 6d iso iso#

#5d mark iii vs 6d iso iso#

Now IР Р†Р вЂљРІвЂћСћm really confused, maybe the big amount of light pollution make the considerations about the ISO irrelevant to me?

comparing stacked sets of three ISO gave me no significative difference comparing single frames (JPG files) at 400, 800, 1600 ISO (with 4, 2 and 1 minute exposure): images seem identical, even photoshop statistics have same figures: being the high ISO frames more I could conclude that SNR in stacked image should be better at high ISO but Р Р†Р вЂљР’В¦Р вЂќРЎС›. I also made some tests, but IР Р†Р вЂљРІвЂћСћm not sure about the procedure:Р вЂќР Р‹. Suppose you can shoot so many frames to raise SNR considerably (how many? 100-200?), then: should you lower your ISO to let photons for fainter parts reach the sensor? I bet there should be a balance between the total exposure time and the time for a single shot. Is 1 minute enough for the above consideration? In my high polluted sky, I can shot 4 minutes exposures at 400 ISO (IDAS LPS filter, newton f4) to reach mid histogram, at 1600ISO I can shot for 1 minute only. This is an argument for keeping lower ISO to have longer exposure time. I read countless articles suggesting 1600ISO for my canon D700 but I still I have one doubt: I read somewhere that if you donР Р†Р вЂљРІвЂћСћt expose for enough time, fainter parts of the DSO may not Р Р†Р вЂљРЎС™sendР Р†Р вЂљРЎСљ enough signal to your sensor. Hi! this is an argument that always puzzles me. Please let me know in the comments below if you think a suggested ISO value is incorrect or if you are missing a camera model in the list!Р вЂќР’В«est ISO values for Canon cameras DSLR model You can find more info here on unity gain and why you shouldnР Р†Р вЂљРІвЂћСћt worry about it. For all suggested ISOs listed below, the read noise is (well) above 1 LSB so the ADC will be dithered properly. This could be the case for instance when you expose long enough and the read noise is swamped by the background shot noise and you get the histogram to 1/3 from the right. You should take this value as a starting point for your own test.Р вЂќР’В¬anon cameras can suffer from banding noise and you might find that you need a higher ISO even than listed below to cancel this out properly.Р вЂќР вЂЎurthermore it is important to note that there is good reason to use a lower ISO value for even more Dynamic Range. Furthermore it is possible that there are differences per camera of the same model. You should always check this data for your specific model and test it to see if it is right.Р вЂќР вЂЎor some models it might be less clear what the right value is than for others. I want to emphasise that the listed ISO values is the suggested value based on the available Sensorgen data.

You can find the list for Nikon and Sony cameras here So if you ever find yourself in a debate about which ISO you need to use, it is always good to know which brand and model you are discussing. It is good to note and realise that, in general, Canon cameras require a higher ISO value to reach this ISOless range than Nikon cameras for instance.

These are the noise values where we call a sensor Р Р†Р вЂљР’ВISO-lessР Р†Р вЂљРІвЂћСћ and there is no benefit in increasing the noise in this ISOless range. This indicates the point at which the upstream noise swamps the downstream noise and all we do is amplify the signal and the noise, hurting our dynamic range. You can check the graph and look for the point in the curve where the linear trend starts.

So I decided to create graphs which are able to show this ISO value really clear. We can look at Sensorgen data to determine this point, although this is not easy to see from the charts in all cases. Remember ISO does not increase the sensitivity of the camera, increasing it doesnР Р†Р вЂљРІвЂћСћt capture more light while decreasing dynamic range will hurt our images for instance in star color. Any ISO value beyond this one has no additional benefit and only decreases Dynamic Range. In a previous article I explained in detail what ISO does in the camera and what, in general, is the best ISO value to use for astrophotography.Р вЂќР’В«asically it comes down to finding the ISO value from which the upstream read noise will swamp the downstream read noise.