Photographing using prime lenses with large apertures also means you can get a shallow depth of field which is useful for portraiture where you might want a softer or blurred background (also known as bokeh). This is an advantage when shooting in low light conditions as it will increase the possibility of hand holding the camera and freezing the subject without shake or blur caused by the longer exposures. Ive been noticing soft images with my Canon 100mm f2. Prime lenses also tend to have a larger maximum aperture (f/1.4 to f/2.8). This may be more appropriate in another forum. The main advantages of prime lenses or fixed focal length lenses are their size and weight as well as their maximum aperture or f/stop. Prime lenses tend to be more compact and lightweight than zoom lenses. They are ideal when you are photographing a variety of subjects such as landscapes and portraits, and you just want one lens for both situations. Using a zoom lens also reduces the number of times you need to change the lens which saves time and limits the possibility of getting dust in the camera's mirror box or on the sensor. Zoom Lens BenefitsThe advantage of a zoom lens is versatility. Prime lenses have a fixed focal length and zoom lenses have variable focal lengths. Focus point is on flower part closest to camera and was not touched between exposures. I've been noticing soft images with my Canon 100mm f2.8 Macro (non-L) at f32 and offer this comparison. Watch the video for more examples and comparisons.There are two types of lenses-prime and zoom. This may be more appropriate in another forum. It just goes to show that price doesn’t necessarily determine quality. Nikon Nikkor 70-200mm f/2.8 has a t-value of 3.3. Sony Planar 85mm f/1.4 has a t-value of 1.6. On the other hand, lens sharpness varies wildly with aperture. This lens has a t-value of 1.4, which means that even though it will open up in terms of aperture, with an f-number of 1.2, you’re losing. Thats because most lenses perform almost identically to other similar lenses at any given f/stop. With the Canon 85mm f/1.2, for example, you really can’t see a whole lot in the way of lenses inside and it’s quite an expensive lens, but you’re still losing a little light. The amount of light that’s coming through the lens that you have to work with in terms of your exposure, balanced with your shadow speed and ISO, that’s t-value. If your f-stop is set to f/4, the diameter of the aperture blades in your lens will look exactly 20 millimeters across (80mm / 4), whereas at f/16, the diameter will be reduced to mere 5 millimeters (80mm / 16). If you can see the lenses inside, that mean there will be more reflection and loss of light. Depending on the quality of the lens you are using, the amount of light stolen varies. I would show some comparison shots from the FZ200 and the full frame Canon. It’s impossible to have a 100% transmission ratio. If you are new to cameras (digital or film) and find the F stop notation. You do lose some light along the way.Īll of the glass lenses inside a lens, as well as reflections, steal a little bit of light. A t-stop is a little trickier to measure since it is how much light, having passed through the aperture and through the elements in the lens, actually gets to your sensor. The numbers in an aperture-f/2.8, f/8-signify a certain amount of light, but that doesn’t necessarily mean that’s how much light is getting to your sensor.į-stop is measured by the size of the opening at the front of the lens. Understanding F-Stop and T-Stopį-stop is determined by the size of the diameter of the circle that the blades of the lens allow light to pass through. Basically, the f-stop is the measurement of the opening of the lens the t-stop is how much light makes it to the sensor. Most lenses are their sharpest from two stops below maximum to about f/8. Photographic cameras are normally measured in f (e.g., f/2.8, f/4) while cinema lenses are normally measured in t. Any time you change anything in your test, youre no longer comparing two lenses. But, what the heck is the t-number? And how is it different from the f-number? Below, Granger explains the difference between f-stops and t-stops and compares a few lenses: The answer? When the f-number doesn’t match the t-number. Prime lenses also tend to have a larger maximum aperture (f/1.4 to f/2.8). Photographer Matt Granger asks the question, “When is an aperture of 2 not really a 2?”
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