Walking by a huge river in Iceland, during a photo-travel there, I noticed a small rainbow, caused by the fast water crashing into a boulder and the angle the sunlight was falling at that time.
I was enchanted so I made many photos here.
Here are two of them, both made with a tripod, the first one being a long-exposure and the second one, a regular picture, taken at 1/100 s.
Long exposure photography requires more time, patience, skills and equipment. I think we will be seeing less and less of it, due to these reasons.
The first photo from this post today is my humble entry to the photographic contest by 
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Some of my favorite photographs and digital art, along with some of my recent visuals, all in the highest resolution and quality, are all available for licensing inside my searchable portfolio at Alamy: https://www.alamy.com/portfolio/112427.html
Are you a fan of NFTs? Check out my portfolio while some of my best photographs and digital art are still on sale: https://opensea.io/LightCaptured
Check out some of my visuals available in high resolution, you could get a license here for publicly utilizing my works, all approved by the quality review team of Adobe, Inc.: https://stock.adobe.com/contributor/206416265/lightcaptured
Copyright: LightCaptured
All the photographs, digital art and text in my posts, unless specified otherwise, are my own property and created by me.
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I wish you one great day; stay safe, stay strong and let your muse be always on your shoulder!
The divider I use in my posts I have created in Adobe Express.