Originally posted by npc I have a K-5 IIs and I am definately ok with the performance of my 15/21/35 limiteds on it. But the 21 is not the sharpest lens ever and the 15 is known for its corner issues.
The 35 is fine on K-5 IIs but recently i saw some pictures taken with it mounted on sony a5100 via adapter and I was somewhat dissapointed with the results (the sony has a 24mpix sensor but I'm not sure if it has AA filter or not) ...
So I was wondering - what is your experience with these lenses on K-3 ? Are they up to the 24 mpix sensor?
The more I take some time to rest and analyse the K3 overall better performance, the more I think that overall:
- the biggest gain comes from the AF that is much faster, much more accurate in low light, much more accurate with fast lenses and much more accurate using off center AF point. This alone can have really more visible impact on sharpness/rendering on most shallow deph of field photos than any added resolution. Put in simply, the AF is accurate with fast apperture even on lenses not known for their good AF support. That's a game changer.
- Compared to K5 (not K5-IIs) there very visible gain in resolution on most lenses except a few on the worst one (18-55 kit lense or 18-250...). The more I see review and reports everywhere, most of it comes from the low pass filter removal that is just a blur filter whose goal is to reduce sharpness/resolution. The 16 => 24MP part alone give a bit more, but no at much as the low pass filter removal.
- The 24 MP sensor is great at high iso, keeping more sharpness than the K5, in particular because starting 3200 isos, there a software blur filter applyed to K5/K5-II/K5-IIs/K30/K50 familly of sensors to improve the high isos numbers repported. This filtering is done on the RAW so you can't get ride of it. On the oppositve, because the pixel are bigger you'll get less noise to start with and this is start to show at very high iso 3200isos+ in shadows.
Overall the K3 is a better general purpose camera, even than K5-IIs. The less processed RAWs out of K3 are more logical but also mean you need to master more denoising software with K3 than K5 familly. For example I discovered that DxO prime algorithm improve much more K3 images than K5 and that it is needed in more occasion. But the better AF alone together with more possibility for crop and increased performances from most lenses make it a great buy. I spend much more time shooting sub iso800 anyway (iso 100 really) than iso1600+.
From the K5-IIs the one reason to upgrade is the autofocus, not the sensor. The sensor difference is much more visible between K5 and K3 because of the lack of low pass filter.
Here for example a 3200iso shoot from K3 and there no issue (click on it for bigger version if wanted):
Here are 2 100% crop of K3 images processed with DxO, but with all setting disabled. They would look far better with some post processing but this show you that this is really quite sharp already but it is because it use apperture where the lenses shine. But this give you an idea of how much margin you have for cropping in ideal conditions.
DA50-135, 80mm, f/5.6, 1/250, iso 100.
DA50, f/8, iso 100, 1/400