08-11-2015, 09:48 AM
Not being able to read your language, but I notice a few downsides right away...
- Very high vignetting (light loss) wide open at 70mm, for 70mm. Through the whole range actually, but more used on seeing that for wide angle.
- iIndeed, does not look very good at close focus. Not really acceptable?
- That tendency to produce swirly bokeh due to mechanical vignetting, pretty unusual for a modern f2.8 standard zoom?