It’s always better to do the things right while shooting itself, rather than struggling in post-processing.
To answer your question straight away, it’s always better to Zoom-in while clicking the photos. Advantages of Zooming-in while clicking are better close-ups, ultimate blurring, pleasing Bokeh, sharp image and a final good resolution photo. Which will never be achieved through cropping the photos from a previously clicked image.
Technically, let me explain the difference between the two things. Assume that I am using a decent 10 megapixel (MP) camera. When we zoom-in while clicking the photo (I assume its optical zooming, I will explain this in the later part), what we eventually do is, capture the desired (zoomed) image on the sensor, utilizing the full potential of the sensor to see the ‘Zoomed’ vision. We let the light fall on the whole 10MP sensor. Whereas, when we click a photo, and later on crop it, what we eventually do is, we underutilise our sensor capabilities at the cost of image quality. Even though we have a potential 10MP sensor, the moment we crop the photo it’s like using that small portion of a sensor. The cropped images will be of smaller size, and of lower quality than the one which is originally zoomed-in while clicking.
Other part of the story, if you possess the full-frame camera body of 24 to 36 MP, the cropped photo will also be of superior quality and pretty good enough to print an enlarged copy of it.
Apart from this clarification regarding optical zooming, if you tend to use the Digital-zooming-in, then it’s the same process as of cropping. Digital-zooming is never encouraged if you care for the image quality. Optical zooming is achieved through the specially designed lenses and which offers effectively better quality.
Hope this helps in your future decision while cropping a photo.
Happy Clicking...!
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