Tokina 35mm Macro

Being one of the most expensive hobbies or professions, photography has become extremely accessible to the masses. When shopping for a wide angle lens, it's hard to find a quality product at an affordable price. Tokina has taken care of this dilemma; the Tokina 35mm macro lens is not only a tack-sharp lens, it's an extremely affordable one. From amateur to professional photographers, the Tokina 35mm f/2.8 macro lens pleases all. From the build quality to optical quality, almost all photographers will be able to enjoy what this lens has to offers. In terms of quality, this lens is a steal. The lens has a maximum f/2.8 aperture, and a minimum aperture of f/22. This aperture range is a beneficial feature for snapshots, family photos, and much more. Having such a great aperture range, this particular lens is good for taking photographs in a low light setting as well as everyday photography. Being a great combination of normal and macro lens, the Tokina 35mm macro makes it easy to control bokeh (out of focus blur) to achieve professional, artistic portrait pictures.

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Using a Light Meter

For many persons, making use of the light meter built-in their digital photographic camera models is suitable enough. On the other hand should you desire to take your digital photography knowledge to a new level, you may need to take into consideration using a light meter that is hand-held.
You will come across two types of metering:
- The first kind is reflective metering. The actual meter within your digital camera is basically reflective metering. It calculates the quantity of light that will bounce off of from your subject into your digital camera lens. Your digital camera makes use of this info to find out variables such as the aperture, ISO and shutter speed if it is fixed on auto-mode.
- The 2nd kind of metering is known as incident metering. Hand-held light meters are generally incident meters. The incident meters calculate the light shimmering on the subject. Simply because they are not relying on the reflective attributes of light to provide you with a reading, they are far more precise when compared with your camera interior meter. The dome that comes in reflective meter contains sensitive sensor that calculates the light entering it from all possible angles.

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Sigma 100-300 mm

The Sigma 100-300 has been in the market for a long time, and they were updated in 2005. The lens comes with a constant f/4 aperture and it was designed to fit the full frame DSLR sensors. The lens comes in a variety of body mounts and has a lens hood and a tripod mount.
The lens also comes with a new multilayer coating that offers a great color performance and at the same time reduces ghosting or flare created by reflections. By design, the Sigma 100-300 will also maintain a minimal light fall-off and ensure that the peripheral brightness is of superior quality. You should expect high optical performance, which is displayed all through the zoon range.
With the Sigma 100-300, you will not worry about aberrations because the two SLD glass elements in the front and rear of the lens enable optical corrections to offer superior quality all through the zoom range. The lens is also available with an inner focusing system, which is responsible for eliminating the rotation of the front element of the lens.
Users of the Sigma 100-300 will benefit from the smooth movement of the zoom and focus rings because they come with the right resistance levels. The rings are made of rubber and this makes it better to handle and easy to turn. The focusing ring will end in soft stops on the different spectrum of focus. Sigma 100-300 also comes with 150 degrees of turning fidelity, making it easier for the users to focus the lens manually. The filters attached to it will not rotate as the lens focuses. 

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Sigma 70-200mm

The Sigma 70-200 is a popular choice for many serious photographers because of the various features it comes with.  It comes with a constant aperture that will make it easier for people to capture photos in different situations. It is also good for taking pictures in lower ISO. This will come handy for shooting in and low light situation. This lens is great for action photography as well.
When it comes to color and contrast, the Sigma 70-200 is excellent. The creamy background blur is facilitated by the presence of the 9-blade apertures. The chromatic aberration is well controlled, but the flare is not so, especially in higher focal ranges. At the 200mm mark, you need to have the sun and other sources of bright light far out of their pictures so that they do not end up with flare that robs the photo of its contrast.
You will not have to worry about distortion when using the Sigma 70-200. The lens shows a little barrel distortion on wide end and pincushion distortion at 100mm, which increases as it reaches the 200mm focal length. When it comes to vignetting, there will be little shading from 135mm to 200mm when the lens is at f/2.8. This phenomenon is especially visible if you use it with full frame cameras.
In order to avoid such problems, it is important that you stop the Sigma 70-200 lens down one or two stops from the maximum aperture. The users will also benefit from the fast and silent autofocus thanks to the Hyper Sonic Motor (HSM). The HSM is not only crucial for internal focusing but also helps in internal zooming. The front element of the lens will not rotate, making it possible to use it with the petal shaped hood.

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