Yeah, the photo is underexposed and that will contribute to the problem.
Even when I have proper exposure and with a different lens I feel the images just aren't very sharp.
I'll add a few pics here for you to see.
I may well be over compensating with 1/400, I have shaky hand lol.
Originally posted by mikesbike Your photo is quite dark, under-exposed. This is one factor detracting from perceived sharpness. Also, set your camera's AF to AF-S, then set for center-only AF point for spot-focus, then use the shutter button half press to establish focus on the eye. Hold that half press to hold focus, reposition the camera for framing and complete your shot. Also, use a little pop of fill flash, even in daylight for outdoor people shots, to fill in shadows and put a bit of catchlight in the eyes. If you wanted the background to be dark like it is, then set your exposure accordingly, then the fill flash would have brightened his face. You can adjust the flash output. A separate flash unit in the hot shoe is preferred, especially with a large lens like the one you are using. However, if in daylight bright enough, you might get away just fine using the built-in flash. Red eye would not be a problem, and any shadow in the lower part of the frame cast by the large lens may not be noticeable- just remove the lens hood.
You really do not need 1/400 sec for fine results in shooting photos of a person just standing there. The upper normal flash sync with the K-70 is probably 1/180 sec which is plenty. In fact, you might be able to reduce your ISO, depending on how bright the day is. Take readings of the background without your subject first to get an idea of optimum exposure without the flash operational, and then be sure shutter speed does not exceed 1/180 sec. You can go as low as 1/125 sec or even a bit lower for a still person. You can keep your aperture to f/3.5 if that blurs your background well, as it has in your sample photo, manipulating exposure also by using the ISO setting.
---------- Post added 04-09-20 at 07:12 PM ----------
I think there was definitely a problem with the lens.
While pics aren't generally as sharp as I'd like, the pics from this lens were awful.
Originally posted by CarlJF It's difficult to say just with only this picture. As others said, it could be a back or front focus issue, but it also could be a misfocus. Unfortunately the data about how the picture was focused are missing in the exif. So, it's hard to tell... You could make a few test pictures using Liveview. If the softness disappear it would strongly suggest a focus issue. On a portrait like this, at 70mm f3.5, there's about 6 inches of DOF and even a slight misfocus could make the picture appears softer than it should be...
As said above, the lens is at its worst: longest end and almost fully open. So, some softness might just be normal with this lens under these conditions... What about other focal length ? Are the pictures still soft at 50mm f5.6 ?
---------- Post added 04-09-20 at 07:12 PM ----------
I think there was definitely a problem with the lens.
While pics aren't generally as sharp as I'd like, the pics from this lens were awful.
Originally posted by CarlJF It's difficult to say just with only this picture. As others said, it could be a back or front focus issue, but it also could be a misfocus. Unfortunately the data about how the picture was focused are missing in the exif. So, it's hard to tell... You could make a few test pictures using Liveview. If the softness disappear it would strongly suggest a focus issue. On a portrait like this, at 70mm f3.5, there's about 6 inches of DOF and even a slight misfocus could make the picture appears softer than it should be...
As said above, the lens is at its worst: longest end and almost fully open. So, some softness might just be normal with this lens under these conditions... What about other focal length ? Are the pictures still soft at 50mm f5.6 ?