I bought an unmarked lens and I have a couple questions. I figured the edges would be less sharp the further from center it got. The lens has 2 front elements and one rear. The rear has 144 written on the side. No other markings on the lens. No waterhouse slot so it's just wide open. As far as I can tell it is a 280mm at F4 from doing research on here on how to calculate it. I'm guessing that's pretty close from my sample shot. Don't mind the spots, scratches and hair, I dropped the negative. Question 1 is, how do you keep the focus on the lens itself from moving? I can grab the the lens and it moves super easy inside the brass outer sleeve. Last question, is there a way to make it more blurry/soft since that is what I had bought it for. Here is a sample picture and a picture of the lens.
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