نقل قول:
You won't see any resolution improvement because lenses aren't good enough. Wrong. You'll see improvement, the question is how much and what you'll see. Let's just pretend for a moment that all lenses are perfect in the central area. More pixels will mean that the central area stays nice and truly resolves what the increase in pixels implies, but the corners will look worse, ironically because the sensor is resolving how much worse the corner is than the center. But even with the visually worse-looking corners, you're probably still resolving more.
Corollary: you need lenses that resolve 100 line pair per millimeter on the D800. From one standpoint, yes, you do. If you want to obtain all the gain that moving from 24mp (D3x) to 36mp (D800) implies, you'd need lenses that resolve somewhere near 100lppmm versus 80lppmm. This is one of the reasons why I wrote previously that we're entering into the realm of declining returns. Going from 3mp to 12mp was a big, dramatic change, and no other component started to hold back the gain from the sensor itself. Going from 12mp to 24mp was reasonably big, and again no other component really hurt you much, though some lower-end lenses definitely showed their shortcomings. Going from 24mp to 36mp is not so big, and now we do have other issues starting to keep us from getting all the gain we expect, with lenses being potentially one of them.
منبع 2 kenrockwell:
نقل قول:
Yes, lens quality is a huge limitation here. This is why the 18MP LEICA M9 and LEICA M9-P completely obliterate the resolution of all DSLRs, because LEICA's lenses, especially normal and wide lenses, are so much better than any SLR lenses — even Zeiss.'
Therefore, unless you really know what you're doing and shooting micro lenses with flat subjects at f/8, you'll only have full resolution in the middle of your image, and only for what's exactly in focus
چند وقت پیش یادم میاد تو سایت آقای کیانی خوندم که برای بررسی اینکه کیفیت مدیوم فرمت ها نشات گرفته از بک دیجیتال با رزولیشن بالاست یا بخاطر کیفیت لنز٬ از یک مبدل جدید که اجازه میداد لنزهای مدیوم فرمت رو روی dslr ببندند استفده کرده بودند و نتایج حاصله شگفت انگیز بوده به این معنی که هر لنزی توانایی ارائه شارپنس و ..... غیر از مرکز لنز نداره.
نقل قول:
I tested the whole DX crop on FF on the D3 and D700, it doesn't look that good. I don't expect better with the D800 since you are stretching pixels your lenses probably can't resolve fully to begin with. If you want to use DX lenses, use a DX body.
