A good SLR for amateurs. Pros, of course, will prefer a different set, at least optics. For the tasks of an amateur, more than enough. I would not even advise you to change the optics if you do not accurately and clearly understand the differences between different lenses. The standard lens shoots very well. Many negative reviews do not speak about the quality of the device, but about the lack of basic knowledge and photography skills. Fully automatic mode and a sufficient number of presets are at a high level, but even they require minimal knowledge of photography as a process. There are no significant complaints about this device. Set the light, build the composition, set the settings correctly, use a tripod where necessary - the pictures are guaranteed to be good. It doesn't make much sense to change D3100, D3200 to D3300 - the improvements will not be as impressive as the difference in past and current prices due to the dollar exchange rate. But if you decide to purchase a SLR for amateur needs and have not dealt with such equipment before, then this will be an excellent choice.
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