What aspect ratio you should use when cropping depends on how you will use the final image.

• If images will be viewed only on screen or projected, use the screen or projector aspect ratio. Newer screens are usually 16:9. However, 8:5, 4:3, and 5:4 are also possible.
• If images will be printed, use the print aspect ratio. Aspect ratios include 3:2, 7:5, 5:4, 14:11, 6:5. Aspect ratios that don't match standard print sizes may be used for double-page spreads or if you don't mind trimming.

Whether a client is bothered or annoyed depends on the particular individual.

• Aspect ratios that differ greatly across images could bother someone who is very particular.
• Differently sized images with the same aspect ratio are unlikely to be noticed because they are all resized when viewed on screen.

Personally, I leave the aspect ratio the same as what the camera produced to avoid double cropping when printing. If I changed the aspect ratio, but decide to return to the original aspect ratio, I'd have to crop again.

What aspect ratio to use when cropping depends on how you will use the final image.

• If images will be viewed only on screen or projected, use the screen or projector aspect ratio. Newer screens are usually 16:9. However, 8:5, 4:3, and 5:4 are also possible.
• If images will be printed, use the print aspect ratio. Aspect ratios include 3:2, 7:5, 5:4, 14:11, 6:5. Aspect ratios that don't match standard print sizes may be used for double-page spreads or if you don't mind trimming.

Whether a client is bothered or annoyed depends on the particular individual.

• Aspect ratios that differ greatly across images could bother someone who is very particular.
• Differently sized images with the same aspect ratio are unlikely to be noticed because they are all resized when viewed on screen.

Personally, I leave the aspect ratio the same as what the camera produced to avoid double cropping when printing. If I changed the aspect ratio, but decide to return to the original, I'd have to crop again.

What aspect ratio you should use when cropping depends on how you will use the final image.

• If images will be viewed only on screen or projected, use the screen or projector aspect ratio. Newer screens are usually 16:9. However, 16:10, 4:3, and 5:4 are also possible.
• If images will be printed, use the print aspect ratio. Aspect ratios include 3:2, 7:5, 5:4, 14:11, 6:5. Aspect ratios that don't match standard print sizes may be used if you don't mind trimming.

Personally, I use 3:2 because that is what my camera produces and it matches the most common print size available to me. If I crop it to a different aspect ratio but decide to print to 3:2, I would have to crop even further which ruins the composition.

What aspect ratio you should use when cropping depends on how you will use the final image.

• If images will be viewed only on screen or projected, use the screen or projector aspect ratio. Newer screens are usually 16:9. However, 8:5, 4:3, and 5:4 are also possible.
• If images will be printed, use the print aspect ratio. Aspect ratios include 3:2, 7:5, 5:4, 14:11, 6:5. Aspect ratios that don't match standard print sizes may be used for double-page spreads or if you don't mind trimming.

Whether a client is bothered or annoyed depends on the particular individual.

• Aspect ratios that differ greatly across images could bother someone who is very particular.
• Differently sized images with the same aspect ratio are unlikely to be noticed because they are all resized when viewed on screen.

Personally, I leave the aspect ratio the same as what the camera produced to avoid double cropping when printing. If I changed the aspect ratio, but decide to return to the original aspect ratio, I'd have to crop again.