ကျွန်တော်ပြောပြချင်တဲ့ Lens တွေပေါ်ကရည်ညွန်းချက်

မင်္ဂလာပါ ခင်ဗျာ သူငယ်ချင်း မိတ်ဆွေအားလုံးတို့ခင်ဗျာလန့်တခုဝယ်တော့မယ်ပဲဖြစ်ဖြစ်တခုခုလုပ်ချင်တာပဲဖြစ်ဖြစ်လန့်တွေမှာရေးထားတဲ့အမှတ်အသားတွေကိုနားမလည်တာကြုံဖူးးကြမယ်ထင်ပါတယ် ကျွန်တေ်ာ ကိုယ်တိုင်လဲ ကြုံခဲ့ဘူးပါတယ်။ အတိုကောက်ကိုသိတယ်အရှည်ကိုမသိတာတွေလဲဖြစ်ခဲ့ဘူးပါတယ်။ photography ကိုလေ့လာနေကြသူ အားလုံးအတွက် လန့်တွေမှာ အမြဲပါတဲ့ အမှတ်အသားတွေကိုစုစည်းပီးဖော်ပြလိုက်ရပါတယ် ။

မင်္ဂလာပါ ကျွန်တော် ကောင်းကောင်းပါ ။

Sigma Lens Abbreviations

• C (Contemporary) – this product line consists mainly of variable aperture zoom lenses for general use, such as standard and telephoto zoom lenses for APS-C cameras (the Sigma 18-200mm f/3.5-6.3 OS HSM Macro C, for example). The way I see it this is basically the place for Sigma’s budget zoom lenses, of which there will be many.
• A (Art) – you will find all the fastest Sigma prime lenses to belong to this product line. Sigma says the Art lineup is “designed with a focus on sophisticated optical performance and abundant expressive power”. Some wide-angle, macro, fishey and fast-aperture zoom lenses will also belong to this category (the 18-35mm f/1.8 HSM A is a good exampl).
• S (Sport) – as you might understand, this product line is for telephoto lenses (both zoom and fixed focal length) designed with sports and wildlife photography in mind. Expect these lenses to be quite pricey and also feature relatively fast maximum aperture settings.
• EX – Sigma’s high-end lenses of old (manufacturer’s equivalent to Canon L and Nikon gold ring series), you can still find a few new and used optics with such designation. Sigma has dropped it for its new lenses, however, so we won’t be seeing any recent products that would belong to the EX lineup.

SigmaLens Format Abbreviations

Sigma is one of the largestthird-party lens manufacturers and, as such, designs lenses for a variety ofsensor sizes:

• DG – lenses compatible with full-frame sensor DSLR cameras.
• DC – lenses designed for for APS-C DLSR cameras.
• DN – lenses designed for compact system cameras. Sigma is yet to release lenses for full-frame mirrorless cameras (the Sony duo), so it is yet unclear if such optics will have a designation of their own (quite likely), or belong to either DN or DG series.

3)Sigma Lens Technology Abbreviations

• HSM – the Hyper Sonic Motor is Sigma’s equivalent to Canon USM and Nikon SWM technology. It is a ring-type ultrasonic motor designed to provide quick and silent focusing.
• OS – optical image stabilization technology used in Sigma lenses; similar to Canon IS, Nikon VR and Tamron VC.
• ASP (Aspherical) – lenses with this designation have aspherical glass elements in their optical design.
• APO (Apochromatic) – apochromatic lenses are designed to correct chromatic and other sorts of aberrations more effectively. Truly apochromatic lenses feature exotic fluorite elements and have no chromatic aberrations at all. According to Sigma, their APO lenses “are telephoto and telezoom type lenses which use special optical designs and optical materials (SLD or ELD glass) to improve their performance. The result is images which have greater contrast, sharpness and color definition than a comparable non-APO type lens .”
• RF – such lenses have rear focusing design, which means that during focusing operation only a few elements positioned behind the diaphragm blades are moved (rather than all the elements). This results in potentially faster AF operation and non-rotating front elements.
• IF – internal focusing is similar to RF, but in this case several optical elements in front of the diaphragm are moved during focusing (rather than all the elements). The size of the lens remains constant, but the focal length might change slightly as you focus.
• SLD – Special Low Dispersion glass elements are designed to minimize chromatic aberrations.
• ELD – Extraordinary Low Dispersion glass elements might have a slightly funny name, but they should perform even better than SLD.
• FLD – F Low Dispersion element, at least according to Sigma, is “the highest level low dispersion glass available with extremely high light transmission.” It should basically perform as well as fluorite elements (that is what the “F” stands for), but is far less expensive.
• TSC – Thermally Stable Composite is a special material that blends qualities of polycarbonate and metal and is used in the construction of some lenses. According to Sigma, it “offers 25% greater elasticity than polycarbonate. Since its thermal shrinkage is low, TSC matches well with metal parts, further contributing to the high-precision construction of the lens.”

CanonLenses

Canon lenses use the following termsto indicate features of each lens:

• Common
  • XYZmm: Focal length
  • f/x.y:
• Focus/Mount Type
  • EF: Electronic Focus
  • EF-S: Short-Back Electronic Focus
  • EF-M: Mirrorless Electronic Focus
  • TS: Tilt-Shift
    • TS-E: Tilt-Shift, Electronic aperture control
  • MP-E: Macro-Photography, Electronic aperture control
• Features
  • IS: Image Stabilization
  • USM: Auto Focus Type: Ultrasonic Motor
  • STM: Auto Focus Type: Stepping Motor
  • (Mark) N: Version of lens (Mark II = v2, Mark III = v3, etc., word Mark may not be present)
  • DO: Diffractive Optics
  • L: Luxury series
  • Macro: close focusing, but not necessarily 1:1 magnification
  • Softfocus ability to use soft focusing for smooth dreamy look
  • PF Power Focus

Maximum aperture (or f/a.b-c.d for variable aperture zooms)

 

 

LeicaRangefinder and SLR Lenses

Leica RF and SLR lenses use thefollowing terms to indicate features of each lens:

• Common
  • XYZmm: Focal length
  • f/x.y: Maximum aperture
• Lens Mount
  • xxx-R: Lens for the R (35mm SLR) system
  • xxx-M: Lens for the M (rangefinder) system
  • xxx-S: Lens for the S (MF DSLR) system
• Lens Speed
  • Noctilux: Fastest lenses with max aperture around 1.0
  • Summilux: f/1.4 lens
  • Summicron: f/2 lens
  • Summarit: f/2.4 or f/2.5 lens
  • Elmarit: f/2.8 lens
  • Super Elmar, Elmar, Tele-Elmar: f/3.4+ lens
  • Telyt: f/3.4 telephoto lens
  • Vario-Elmar: Zoom version of Elmar (see above)
• Features
  • ASPH: Lens with aspherical elements
  • APO: Lens with apochromatic correction

Note: There are sometimes small numbers engraved next to theinfinity symbol on the focusing scale. These numbers indicate a difference ofthe actual focal length of the lens compared to the nominal value in tenths ofmillimeter. For example, if the number is 14 and the lens is 50mm, the actualfocal length is 51.4