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Forum: Pentax SLR Lens Discussion
09-18-2015, 04:38 AM
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No not necissarily. It comes down to the airy disks of the lens and whether they correspond to the pixel pitch.
DA lens are made with better materials than many older legacy lenses, and are projecting an image circle to suit the crop sensor rather than that of the 35mm size. The airy disks of the DA lenses correspond to the pixel pitch. There is no digital enlargement, the statement is incorrect.
Spiros Heniadis explains airy disks here:
You Tube
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The situation with Canon users regrading using FF lenses on crop or even on the 50mp 5D, is that Canon recommends certain lenses to suit either sized sensor.
What is probably "doing your head in" is that the Sony Bionz image processing firmware is removing the purple fringing from the images. They expected folks would use old lenses, so they made CA removal possible. Turn off CA removal and see what you get.
I have a Fujifilm camera that removes the red veins from eye's automatically.
I'd say its just Bionz removing CA's and not the supposed miracle of FF.
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Forum: Pentax SLR Lens Discussion
06-11-2015, 05:10 AM
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I have found that the modern lenses are better than older film era lenses ....... for digital. But I haven't been into photography long enough to have had a good array of film era lenses and modern era lenses. So much so I'm planning to get rid of some of them. Though I do have a Sigma 50mm 1.4 which is a "digital era" lens, and is not that special. I would really need to give it another chance, but if it sucks its gone.
My DA* 16-50mm 2.8 is sharper at 50mm compared to my FA 50mm 1.4. The 16-50 is a better lens, but the FA 50mm 1.4 has taken some very nice pictures and I enjoy using it for narrow dept of field photography.
Lens designs are changing due to the artistic needs of pro photographers. Today they want lenses that are sharp wide open etc. Over the years photographers wanted better and better performance.
Digital optimized means the lens is generally sharper, to cope with the higher resolution of the mega mega pixel crop bodies. The airy discs now have to suit the finer pixel pitch.
Should all film era lenses be put on the shelf to collect dust ....... I don't think so. Some of mine are really nice, but of course I would prefer if they were modern and optimized for digital.
I think opinions on this matter will vary, so what I would do is go on search for a lens on flickr, and see what people are producing out in the field. If you like what you see, then pick up a copy.
I've seen film era lenses which seem very interesting, and I might give them a try. But they have to do something real special.
But as a rule of thumb, the modern lenses are much better.
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