What is a safety shutter?

Safety shutter means that the photos you take with this shutter value "look" without shaking, so the size of the output picture is also one of the keys. Now SLR cameras have tens of millions to tens of millions of pixels. Even if you shoot with a safety shutter, you may see a slight jitter at the original size of 100%.

Next, let's take a look at the precautions for using the safety shutter.

The most basic, minimum and original requirement of a photo is that the picture should be clear. If you want to take a hand-held photo without shaking, the simplest thing is that the shutter should be fast enough, but too fast the shutter may be underexposed. So after continuous shooting, the photographer came up with the theory of the slowest shutter value without hand shock, which is the so-called safety shutter. Traditionally, the simple and general definition of safety shutter is that the shutter value is not slower than 1/ lens focal length. If you use 50mm and the shutter value is 1/50, you can take pictures without shaking hands.

Is it really that simple?

The definition of safety shutter has a long history and has been effective in the film era. Does this formula still work in today's digital age? Before answering this question, a footnote must be set for this formula. The safety shutter is only suitable for people who know how to hold the camera correctly. It is used for 135 film (that is, the current full-frame camera) to take 4R-sized photos under normal shooting conditions (that is, under special circumstances such as not walking and not taking macro). Note that this is for cameras or lenses that do not have hand shock prevention function. If there is shockproof, the shutter value can be adjusted slower than the safety shutter according to different shockproof technologies.

Is the safety shutter safe?

Everyone's hand tremors are different. If you always take shaking photos, even at a safe shutter value, you may need to retrain the correct method of holding the camera. In addition, you should know that hand-held cameras will vibrate, the only difference is the amplitude of vibration, and the safety shutter means that the photos you are taking with this shutter value "look" without vibration, so the size of the output picture is also one of the keys. Now SLR cameras have tens of millions to tens of millions of pixels. Even if you shoot with a safety shutter, you may see a slight jitter at the original size of 100%. If you want to come up with posters or bigger photos, the traditional safety shutter may not be enough, so the shutter should be set faster when shooting; Interestingly, while we are pursuing high-pixel, high-resolution cameras and lenses, 99% of the output media upload photos online, and now most viewers also use mobile phones to watch social media. If we look at photos the size of a mobile phone, even if there is a slight hand shake, it is not easy for us to find it. Therefore, the answer to the question of "safety" of safety shutters is somewhat contradictory. In today's high-resolution photographic equipment, the traditional safe shutter value has become unsafe, but at the same time, because most of the photos output by users are small in size, in most cases, "it seems" that there is no hand shock problem, that is, it is actually quite safe.

Limitation of safety shutter

If you are shooting moving subjects, such as sports, children and pets, in order to get clear images, the safety shutter is of no reference value. What you want is a faster shutter to cure the subject. In addition, because the subject of macro shooting has been greatly enlarged, it will be obvious from the photo as long as the lens is shaken a little, so the safety shutter is not suitable for macro shooting.

conclusion

The safety shutter is a reference value, and the actual situation will vary according to the shooting environment and the person who operates the camera. At present, the image resolution of photographic equipment has been greatly improved, and the hand shock prevention technology is becoming more and more advanced, so the safety shutter still has reference significance today. Why not try it yourself, starting with the safety shutter value and shooting with different focal lengths, so as to get the accurate personalized safety shutter value.

The above is an introduction to what a safety shutter is and the matters needing attention in use. I hope it helps you!