More grain with wider lens???
Posted 02 November 2006 - 06:04 PM
Question: Is this a result of the 10MM lens? Does it being a 35MM format lens rather than a 16MM format lens have any effect???
I'm scratching me head over here...
Posted 02 November 2006 - 07:28 PM
it seems that pictures shot with a longer lens tend to mislead the eye in a way that you notice less "failures" like grain etc... but this might be as well a purely subjective opinion of my own...
The lens shouldn't affect the grain, if you exposed the same way like the rest there shouldn't be any difference in grain...
I'd analyze the shots as still pictures, zoom in on a shot with a longer lens and do the same thing with a 10mm shot, then put one a side another and look if there really is a difference in grain...
Posted 03 November 2006 - 08:17 AM
I'd like to add a couple of thoughts. Wide lens design is much more difficult than normal perspective lenses. The problem is that you're trying to squeeze much more information onto the film frame. We're taking both sides to the max, as well as top and bottom. That's a lot of complex lens design. I can't imagine the necessary formulae! I've spoken to lens designers at Panavision over the years, and they say that to design a perfect wide lens would almost be economically unfeasible--they can get very close, but generally something misses the mark. Holding perfect definition over the total area suffers. Contrast suffers. Flare becomes more of a problem. The rear exit pupil disperses light over a wider area and can cause internal reflections in the camera, etc.
Another aspect is finding focus. As you know, it's much more difficult to "hit" your focus point because of the depth of focus and our eyes' difficulty in distinguishing 7 ft from 8 ft, for example. This slight shift may be seen as grain to our eyes. Adding all of the negatives mentioned above might translate to a grainier look when compared with "normal "lenses.
I find that I need to check wide lenses with running film all the time. The normal film-in-motion pullback is greatly emphasized when using anything wider than 35mm in 35 format or 12mm in 16mm.
So, to summarize a long-winded post, I think there's just a difference in the look of wide lenses because of their inherent envelope-pushing design; I don't think the problem is anything you've done. Just make sure your focus is right on with these wider lenses by having it checked with moving film (important) on a collimator. Hope this helps a little!
Posted 03 November 2006 - 08:52 AM