Poisson Du Jour
Member
The athletes look better in colour. 
I do not know a great deal about these early lenses but I have known some references to them as being astigmoid. How is it that a Petzval can be so razor sharp in dead centre and myopically trashed right behind the centre, such as the swirls. The guy with the bmx bike is a case in point. That's a very curious effect. Astigmatism is rampant yet the central subject is curiously razor sharp. I'm wondering if there is a hybrid element to the job. I wonder if we'll ever see the original paper negs?

I do not know a great deal about these early lenses but I have known some references to them as being astigmoid. How is it that a Petzval can be so razor sharp in dead centre and myopically trashed right behind the centre, such as the swirls. The guy with the bmx bike is a case in point. That's a very curious effect. Astigmatism is rampant yet the central subject is curiously razor sharp. I'm wondering if there is a hybrid element to the job. I wonder if we'll ever see the original paper negs?