Well, now it is snowy white sunny freezing weather, these are ideal situation for an ultimate sharpness comparison between my three old budget lenses.
K300 (€90) vs A400 (€250) vs RMC400 (€80)
I am really surprised by the huge resolving power these old film era lenses show on a 24 MP APS-C sensor.
My setup:
- 100 ISO
- 2 sec timer
- steady tripod plus extra foundation of the lens front to avoid any shaking
- manual focus using live view at 16x magnification
- JPEG / extra sharpening -2
- no post processing in PS.
- I cropped all shots the same way twice, the expanded blue label has a size of 3 cm or so.
- On an object 60 meters away I can read these labels on the cables with all these lenses stopped down a bit.
Focusing has to be done quite precise, and is a little difficult because of the shaking. These are not lenses to catch flying birds but static objects are fine targets.
The RMC maybe is the most valuable lens of this three, it is dirty cheap, extreme compact, great build and has internal focusing. At F5.6 the K300 F4 is even sharper then both 400's wide open (!)
Note: This is all about center sharpness, I did not examine borders and corners. The A400 has a wider front element then the RMC400, so there might be differences in sharpness and vignetting between those two.
Last edited by Henrico; 02-13-2021 at 02:54 AM.