Dutch another route you can take is getting an m42 adapter, this will allow you to use older lenses such as the Vivitar Series 1 90/2.5 . This is considered to be still one of the best optical lenses. Of course using an adapter you will need to set your camera to M and do everything manually but you can save a ton of cash this way. I would also highly suggest a tripod and macro focusing rail if you’re going to go super shallow.
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