In day light taking long exposure photo you must do:
You switch iso lower or closer to low
Except a few conditions you must use ND filter... The more quality ND filter the better results in pictures
You should take the pictures in RAW to edit light in pictures...
Anyway today I share a river picture taken in Trabzon with my sony a7R and Soligor 20mm f2.8.
20mm ~ f8 ~ 20s ~ ISO50
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Thank you and have a nice day...