06-30-2016, 05:52 PM
I do not know which focussing screen reviews you refer to. I know from 1st hand that for big aperture manual focus, the Eg-S is very nice. For small apertures not so much (gets dark).
I agree on the SP 500mm f8. In film times we did not magnify images so much, so that kind of lenses seemed more impressive. But now, it still is most lovely to take along (compact and light!). With FF you get a bit less reach, due to the crop factor. Which helps the lens' limited resolving power somewhat, of course. At its best when using live view and a support, so you have the time and stability to nail focus (magic lantern firmware is nice for this lens too, with focus peaking and magic zoom).
Yes, you can calculate equivalent f-stops for the same DOF with the crop factor. Handy to know.
I do not know how exactly DOF "reacts" with changing the distance and the sensor format and the focal length/FOV and aperture size. Too many variables for my brain to process today?
About diffraction softening: When you stop down both APS-C and FF to the same DOF (so: equivalent F-stops), you get similar diffraction softening on image level, too.
With equivalent settings (so: same FOV/equivalent focal length, same DOF/equivalent F-stop) you get similar sharpness on FF as on APS-C. If the lenses are the same "sharpness", one can argue that the central sharpness gets smeared out over the whole image due to the crop factor, of course. But then one can also argue that the weaker borders of the projected image get cropped away on APS-C due to that same crop factor. But yeah, with FF and APS-C with equivalent settings, you get similar softening due to diffraction.
At base ISO, when a minimum exposure time is no factor, FF does have an advantage. The moment you do need to crank up the ISO to maintain a certain minimum exposure time, the FF advantage (providing we do use equivalent settings) mostly disappears, as we have a higher F-stop on FF and therefore also a higher ISO setting. So, in practice, only when there is more than enough light, you get the FF IQ advantage.
I am happy with my 6D, I just do not agree with that FF is better for everything and everyone! For me, yes, FF has the advantage of possible bigger apertures = more shallow DOF. So, I am a happy camper with my FF 6D, indeed.
So, if you also have a more shallow DOF desire (be it a main purpose or a side-purpose), by all means try FF. But for stopped down stuff for big DOF stuff only, in my opinion FF makes way less sense. Unless you always have enough light to be shooting at base ISO regardless of the stopped down nature of things, because then FF can show a slight advantage in IQ. Although, I am quite sure the 80D narrowly beats the 6D at base ISO (at least noise wise).
About the macro thing (APS-C getting more subject magnification on the resulting image): you can always ad stuff like an extension tube when you need more magnification than 1:1 on FF. I very, very rarely find myself going towards 1:1, so it does not impact my move to FF.
Yep, happy with my 6D. Happy with it being FF, happy with it running Magic Lantern extended firmware, happy with the FF OVF it has, happy with the WiFi remote live view, happy with the Eg-S Super Precision screen for larger aperture manual focusing. And happy that I understand lens equivalence, exposure/ISO equivalence.
I agree on the SP 500mm f8. In film times we did not magnify images so much, so that kind of lenses seemed more impressive. But now, it still is most lovely to take along (compact and light!). With FF you get a bit less reach, due to the crop factor. Which helps the lens' limited resolving power somewhat, of course. At its best when using live view and a support, so you have the time and stability to nail focus (magic lantern firmware is nice for this lens too, with focus peaking and magic zoom).
Yes, you can calculate equivalent f-stops for the same DOF with the crop factor. Handy to know.
I do not know how exactly DOF "reacts" with changing the distance and the sensor format and the focal length/FOV and aperture size. Too many variables for my brain to process today?
About diffraction softening: When you stop down both APS-C and FF to the same DOF (so: equivalent F-stops), you get similar diffraction softening on image level, too.
With equivalent settings (so: same FOV/equivalent focal length, same DOF/equivalent F-stop) you get similar sharpness on FF as on APS-C. If the lenses are the same "sharpness", one can argue that the central sharpness gets smeared out over the whole image due to the crop factor, of course. But then one can also argue that the weaker borders of the projected image get cropped away on APS-C due to that same crop factor. But yeah, with FF and APS-C with equivalent settings, you get similar softening due to diffraction.
At base ISO, when a minimum exposure time is no factor, FF does have an advantage. The moment you do need to crank up the ISO to maintain a certain minimum exposure time, the FF advantage (providing we do use equivalent settings) mostly disappears, as we have a higher F-stop on FF and therefore also a higher ISO setting. So, in practice, only when there is more than enough light, you get the FF IQ advantage.
I am happy with my 6D, I just do not agree with that FF is better for everything and everyone! For me, yes, FF has the advantage of possible bigger apertures = more shallow DOF. So, I am a happy camper with my FF 6D, indeed.
So, if you also have a more shallow DOF desire (be it a main purpose or a side-purpose), by all means try FF. But for stopped down stuff for big DOF stuff only, in my opinion FF makes way less sense. Unless you always have enough light to be shooting at base ISO regardless of the stopped down nature of things, because then FF can show a slight advantage in IQ. Although, I am quite sure the 80D narrowly beats the 6D at base ISO (at least noise wise).
About the macro thing (APS-C getting more subject magnification on the resulting image): you can always ad stuff like an extension tube when you need more magnification than 1:1 on FF. I very, very rarely find myself going towards 1:1, so it does not impact my move to FF.
Yep, happy with my 6D. Happy with it being FF, happy with it running Magic Lantern extended firmware, happy with the FF OVF it has, happy with the WiFi remote live view, happy with the Eg-S Super Precision screen for larger aperture manual focusing. And happy that I understand lens equivalence, exposure/ISO equivalence.