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Flash Top Tip

Power settings.

Remember that each time you change a flashgun's power setting, you are effectively increasing or decreasing its output by a stop. So changing from 1/8 to 1/4 power increases its output by a stop (in other words doubles the flash) while changing from 1/8 to 1/16 halves the output.

Resource: Digital SLR Photography Issue 47

Composition: Focus. Frame. Shoot!

Focus.

First, you’ll need to make one setting change to your DSLR. Here’s the deal: every DSLR camera has several auto-focus points that it uses to focus an image, and you want to shut them all off except for the center one. On my Canon, I change this in the “AF point selection” setting but it may be called something different on your camera.

Did You Know?

If you want to use  your DSLR with electronic flash, be it a portable flashgun or more powerful studiolfash, you need to remember that your camera has a maximum shutter speed at which flash can be synchronised. this variance from model to model and can be anywhere from 1/160 seconds to 1/250 seconds. The latter being the most common. You can use a shutter speed slower than your camera's flash synchronisation speed, but if you use a shutter speed that's faster, part of the image will be blacked out because the flash will fire before the shutter is fully open.

Resource: Digital SLR Photography Issue 47

How To Test The Lenses

• Sharpness.
  Sharpness is a combination of resolution and image contrast. Resolution and contrast are directly linked and when one goes up, the other goes down. Use Modulation Transfer Function (MTF) analysis to measure sharpness, as do lens manufacturers. Result are shown as % MTF at 24 lines-per-mm for full-frame lenses and at 36 lines-per-mm for APS-C to adjust for the crop factor, so sharpness is generally slightly lower than full-frame, in line with actual use. Multiple readings are taken and averaged, and edge readings are taken from points 1-2mm from the sensor edge. Peak resolution shows maximum lpmm at 20% MTF, which is the lowest level where light and dark tones can be reliably measured., though the difference is faint.

Awards Winning Lenses

Tamron SP 24-70mm F/2.8 Di VC USD

The world 's only full-frame F/2.8 standard zoom with image stabilization (VC).

Nikon vs Canon DSLR

 








  
  Nikon and Canon are as good as each other overall. Each makes equally excellent lenses at the same price points, and each makes DSLRs with the same technical quality in each format.