Your next lens upgrade is not a Canon L series lens, Premium Nikon Lens or a Zeiss glass for your Sony. Right? And instead, all you could afford was a “cheapo” lens and your photos are not as sharp as you expected them to be?
I came across this issue too and below are some examples of how the pictures used to be before I find the perfect solution for it. I bought a Canon 70-300mm f/4.5-5.6 lens which I started to regret in the beginning.
To me, there are not enough details in this image even after post-processing it and adding sharpness. The solution to this is to was first to never shoot at 70mm and 300mm. Because at these two focal points, the lens sharpness is weak but in between these two, an average sharpness can be obtained with less chromatic aberration. So, never shoot at the exact start or end focal length of whatever the lens is.
The second part of this solution was to shoot at f/6.3 or above. BUT beware, this is not suitable for shooting in low light situations. At f/6.3 and above for my Canon 70-300mmf/4.5-5.6, the image started to be sharper than at f/5.6. At f/7.0 it was even better but I try to avoid such low aperture as this can result in a slow shutter speed and high iso which will turn out to be useless in some cases. However, you can still get cool bokeh effects out of it but your subject must be close to you and you should shoot at 250mm-290mm(in my case), that is as zoomed in as possible. Even if you’re using a 50mm f/1.8 lens, if you shoot at f/2.0, the image will be sharper.
Most “cheapo” zoom lens comes with the aperture range of f/4.5-5.6 but if it is not the case for yours, just set the aperture one or two stops above the minimum when zoomed it completely.
Below is an example of applying these two steps above.
Shot on Canon 450D + Canon 70-300mm f/4.5-5.6 at SS 1/450, ISO 400, f/6.3.
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