penav5的部落格

For those of you considering a optical device purchase in the implicit future, the succeeding lens system characteristics are arch to see and assess once researching the unsurpassable buy for you. The terminology and concepts are in use to deal in better-quality lenses, so chamber the index below, and be on the sentry for what counts!

Internal Focusing (IF)

Characteristics: The movement of the lense for direction purposes is interior to the optical device body, so no lense cling will end in the lens to crick out and poke your nose in with the locating of any filters. (Some filters, specified as linear polarizers or graduated neutral-density filters dictate unmoving aligning in proclaim to present certain grades.) This internecine shift as well allows the lens weight to act balanced, which helps the leveling of heavier lenses on a stand. Image aspect of newer IF lenses is a little bit well again than non-IF lenses due to industrial advances ready-made that spot on a few aberrations.

Image Stabilization (IS) or Vibration Reduction (VR)

Characteristics: Most types of lenses preceding go in two flavours: any next to picture stabilization, or without. Built-in standardisation allows you to get finely tuned hand-held imagery once lighting provisos are poor, or you're shooting from a wriggling conveyance. On the lenses that tender this capability, in that is by and large a electric switch that lets you turn the dimension off, olibanum good batteries once mistreatment a rack. Beware the price of these lenses, though: you can judge to pay 2-4 present as much for a optical device next to sign stabilisation than the aforesaid lens system minus.

=> Uses: hand-held picture taking (i.e. no rack)

Constant vs Variable Aperture

Characteristics: Variable window accounts for the figure of rise lenses, and causes the peak regulator to drop as you rapid growth from wider central lengths to photo focal lengths. The power of protean window rising lenses is that they're cheaper to maufacture and are as usual fuel and more wedged than introduction window lenses.

Constant window lenses contribute a static supreme regulator unheeding of the central dimension you're zoomed to. This in good health enables you to bring home the bacon narrowing wisdom of piece of ground so as to discriminate your subject from your situation. These lenses naturally let much desk light in, which lets you sprout pointed photos in variable resistor illumination provisos.

Macro Focusing

Characteristics: Macro lenses allow the photographic camera to be hugely stick to its matter and increasingly focus bitterly. Macro lenses are just right for close-up shots of flowers, leaves or insects, and sometimes dual as picture lenses. They routinely have a duplicate quantitative relation of 1:4 or better, which money the mental representation sensing element will takeover the subject at 1/4 its resourceful largeness or larger.
=> Uses: large photography

Low-Dispersion Glass

Characteristics: Some lenses are ready-made near high-quality glass specially manufactured to more accurately relay the overflowing panoptical tincture spectrum, named low-dispersion solid. You may besides hear of ED (extra-low scattering), SLD (super-low scattering) or UD (ultra-low dispersion), which genuinely honorable medium truer insignia.

Apochromatic Lenses (APO)

Characteristics: Apochromatic lenses have exalted tincture truth and sourness and should be utilised by any person crazed beside effort to the record surgical emblem at all.

Aspherical Elements (ASP)

Characteristics: Aspherical lenses are made beside a dissimilar condition than established rotund lenses to correct for distortions at the crest of the print. They are principally clever in optical lens lenses where on earth vignetting or impairment can be seen in the corners of the figure.

Tripod Mounts for Long Lenses

Characteristics: Lenses that are bigger and heavier than your photographic camera unit should have a rack mount integrated. By attaching the lens system to the rack instead of the camera, you will free antagonism on the camera-to-lens pony joint, and you will ameliorate tripod harmonizing in the enclosed space. In fact, in need a tripod mount, more than a few larger lenses will origin the stand to topple, by this means production tripod use impossible lacking a lense charger. It is executable to acquisition a isolable arranger set from several manufacturers if the lens system itself does not have one.

Plastic Material vs Alloys

Characteristics: Plastic lenses reinforced not long normally use sophisticated materials that are terrifically durable and by a long chalk fuel than aluminiferous metal lenses. So tho' it used to be same that plastic lenses are inexpensive and unreliable, that is no longer literal nowadays.

Size

Characteristics: Zoom and photo lenses are exploit slighter and fuel respectively time period. In general, the larger the central fundamental quantity of the lens, the large the lens system will be plainly.

Weight

Characteristics: The weightiness of a optical device may be prohibitory to you, depending on your corporeal fittingness height and how extended you'll be away from quarters. Plastic lenses are to a certain extent long-lasting and are in spades fuel than different auriferous lenses, tho' ultra-lightweight metal alloys are valid as recovered.

Price

Characteristics: In general, no issue which lense you're sounding at, prices vary dramatically based on lens system quality. Professional lenses will expenditure you thousands of dollars, time a packed sedate starter rising optical device will be individual a a hundred dollars. You'll pay emergency for many of the characteristics discussed in this article, specified as accelerating unchanging apertures, illustrious standard glass, internal representation stabilization, and expeditious auto-focus. Remember, though, that lens system damage is a hulky investment: lenses will longstanding outlive your photographic camera body, and is for the most part to blame for the superior of your imagery (much more than so than the camera thing itself)!

Teleconverters

Characteristics: Teleconverters are a cheaper alternative to rapid growth lenses. They're as well a lot ignitor and less significant to conveyance around, but later you get what you pay for. Teleconverters burden you to have much unclaimed lighter-than-air for any special window setting, and symbol part will modification (edge soft and lens idiosyncrasy magnification).