siterider.blogg.se - Nikon macro lens for close up photography

The main disadvantage of reverse rings is that they result in an extremely narrow range of distances which can be in focus. Shorter focal length lenses will allow for closer focusing distances and higher magnification. They attach to your camera where you would normally mount the lens your lens's front filter mount then screws onto the reversing ring, causing the inner (and normally hidden) part of your lens to face outward. These allow your lens to be mounted in the reverse direction. However, bellows can be quite cumbersome, so studio/tripod use is usually a requirement. They're typically much more expensive than normal extension tubes, but also often enable your lens to make tilt/shift movements to reposition the depth of field. These are basically adjustable length extension tubes. Disadvantages include (i) a loss in image quality and (ii) an increase in the len's minimum f-stop (max aperture), which may prevent a camera from being able to autofocus.īellows. The teleconverter multiplier directly correlates with the increase in magnification a 2X teleconverter therefore doubles the maximum magnification. Even though these are typically used to increase a lens's focal length, they're also a popular way to increase magnification. Popular alternatives include the following: While extension tubes and close-up lenses are the two most common ways to increase magnification, other options exist.

May prevent your lens from being able to use other filters.

Often more expensive than extension tubes (but less than a dedicated macro lens).

However, double element close-up lenses minimize most of this quality loss. Places additional glass between your camera and subject, which may decrease image quality.Decreases the working distance for a given amount of magnification (the distance between the subject and the front of your lens).Provides a minimal magnification gain when used with focal lengths less than ~80 mm.A different close-up lens is required for each filter size close-up lenses are also unavailable in filter sizes greater than 77 mm. Doesn't require removing the lens from the camera body.However, when both are set to the same depth of field and magnification, both capture roughly the same amount of light. Retains more light at a given f-stop setting when compared to extension tubes (since the effective aperture no longer increases).Lenses used for above comparison: Canon EF 50 mm f/1.4 USM, Canon EF 100 mm f/2.0 USM, Canon EF 200 mm f/2.8 II USM If any of the above disadvantages has the potential to be a problem, it's worth considering using either a dedicated macro lens or a close-up filter (next section). With zoom lenses, the image can go quickly out of focus as one zooms in or out.Requires that you remove your lens from the camera each time you wish to change the amount of extension (which raises the risk of dust settling on your camera sensor).High magnification images will therefore usually have lower quality than with a dedicated macro lens. Causes your lens to focus more closely than it was designed.

F-stop set by your camera might not represent the effective f-stop from extension (as described in the tutorial on macro lenses: effective f-stop).

Causes your lens to lose the ability to focus on distant objects.

Provides only a minimal magnification gain with telephoto lenses.

Provides consistent, predictable quality regardless of extension tube brand.Doesn't place additional glass elements between your subject and your camera (thereby minimizing any potential loss in image quality).

Provides a flexible and upgradable increase in magnification with virtually any camera lens - even existing macro lenses.

Much less expensive than purchasing a dedicated macro lens.

One should weigh the pros and cons appropriately: While extension tubes are an amazingly flexible solution, they're not always the best option for your photography. Additionally, older extension tubes don't always work with newer lenses designed for cropped SLR sensors. However, build quality may be an important consideration - particularly if you plan on using it with a heavy telephoto lens. Image quality shouldn't be a factor when deciding between different brands of extension tubes (all use the same low dispersion air). Extension tubes also usually include basic electronics to pass through signals between the lens and the camera body (such as for autofocus). Examples include the Canon 25 mm EF II, the Nikon 8 mm PK-8 and the Kenko DG 12 mm, amongst many others. Most manufacturers provide a range of extensions from 8-35 mm, although multiple extension tubes can be stacked to increase the extension even farther. An extension tube is usually specified in terms of its extension length in millimeters.