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Hi Guys, Long story short: Is it worth doing 4 min exposures with ISO 100 using Canon 1300D (not yet moded..) on DSO. Or it's better to stick with default ISO 800 and 1min? @ISO800 1min is the top exposure I can use from my back garden in London even with a light pollution filter on.... Long Story: I "recently" managed to get all beginner's equipment and started to experiment with long exposures (I had DOB previously). "Recently" - almost 2 months ago, and during that period I managed to play with it 3 times only... London is like the Adams Family house, - constantly under the clouds... I have Canon 1300D and SW 130PDS guided via ZWO224 (not completely guided yet... as still learning ). Initially, I thought I will figure out the best ISO/exposure settings while experimenting... But 1 experiment per month... VERrrrY painful... and it would be the top rate masochism to enjoy experiments with such a frequency... So I have been googling, reading forums and even going through the astrobin/flickr pictures and checking ISO/Exposure parameters, checking all kind of data sheets with sensor data, but managed to find only for Canon 1200D like for example http://sensorgen.info/CanonEOS-1200D.html or http://www.photonstophotos.net/Charts/DXOPDR.htm and nothing for 1300D. If you have any link, you are welcome to share. From all data I have read for my range CANON ... usually, - ISO800 is recommended or even ISO1600!!! - Wow!!! Seriously??? I used ISO1600 with my DOB for 10sec exposures As far as I learned, - All DSLR cameras have the best Dynamic Range with the lowest ISO possible, with 1300D it's ISO100, so I would expect to get the best DSO colours and shadows using ISO 100, However, I was amazed founding out that Canons have the Highest Read Noise at low ISO settings... (I was not able to find any data for 1300D, but I guess data from 1200D sensor is more or less the same). It looks like a sweet spot would be ISO 400 which would be 1.5 - 2min exposures maximum... Please correct me if I am wrong. P.S. Last time I tried ISO800 and 1min exposures, - after stacking with all darks, flats and bias the result was very noisy. I even afraid thinking about the amount of noise with ISO100, but I will try it next night anyway... Curiosity ...