Lenses Dealers in Vikas Puri, Delhi

• Color: Black
• Shape: Round
• 2MP: Dome
• Pixel: 3MP
• Camera Range: 15 to 20 m
• Storage Temperature: -10 to +70 C
• Lens Size: 2.8 mm

• Features: Excellent optical properties, Scratch resistant, Non breakable
• Size: 2.8 mm to 12 mm
• Lens Type: Glass lens

Spectacle Lenses, Optical Frames, Optical Lens, optical products

• Type: Colored Contact Lenses
• Shape: Round
• Color: Blue, Dark Blue, Green, Transparent
• Packaging Type: Plastic Cap, Plastic Packet
• Thickness: 0.0-0.1mm, 1.5-2mm
• Feature: Easy To Wear

A Barlow is a negative (diverging) lens that is placed between the objective lens (or primary mirror – from now on these words will be used interchangeably) and the eyepiece of a telescope. It increases the effective focal length of an objective lens, thereby increasing the magnification. The idea is that 2 eyepieces and a Barlow will give you the flexibility of magnification of 4 eyepieces, and will give higher magnifications with less powerful eyepieces.   What are its Advantages and DisadvantagesAssuming that the Barlow is a good one, the only disadvantage is a slight loss of light throughput – this is of the order of 3%. The advantages are numerous: Higher magnifications can be attained with longer focal-length eyepieces than would be possible without the Barlow. Short focal length eyepieces necessarily have optical surfaces that are more curved and therefore are likely to introduce more aberrations. A Barlow increases the effective focal ratio of the objective. This gives a more acute light cone, which is less demanding of eyepiece quality because: Rays at the periphery of the cone are closer to being paraxial and thus are less subject to aberration. A smaller area of the field lens is used. Many eyepieces have an eye relief (distance of exit pupil from eye lens) that is directly related to its focal length. For example, the eye relief of a Plössl is 0.73 × its focal length. Thus, with these eyepieces, for a given magnification there will be greater eye relief with a barlow than without. Many eyepiece types do not work well with short focal-ratio objectives. The Barlow effectively increases the focal ratio, allowing the eyepiece to work well.

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Progressive Lenses, Eye Glass, Prescription Glasses, progressive glasses

• Type: lense
• Brand Name: canon
• Color: black

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The 50mm f1.8 Lens for Canon EF Mount from Yongnuo is a very lightweight standard focal length prime lens with a fast maximum aperture for effective low light capture and shallow depth of field control. With both manual and auto focus capability, this is a versatile, convenient and easy-to-carry optic with a focal length ideal for everyday shooting. Multi-coated lens optics provide enhanced light transmission and reduce ghosting and flare. The lens fits Canon EF mount DSLRs in both the full frame and APS-C format. On APS-C format cameras, its 35mm focal length equivalence is 80mm. Its minimum focus distance is 1.5' and it offers a 52mm filter thread diameter. Features: Standard length prime lens for Canon EF mount DSLRs Fast f1.8 maximum aperture provides sharp capture in low light and enables shallow depth of field control. At just 4.2 ounces, it is a comfortable carry for day-to-day shooting and numerous hand-held photo applications. The lens uses gold plating for the metal contacts, effectively improving the signal conductivity and corrosion resistance. Multi-coated lenses improve the light transmittance. Supports MAvTvP and other camera shooting modes and the aperture data can be displayed in the EXIF information. Package Content: 1 x Yongnuo 50mm f1.8 Lens 1 x Front Lens Cap 1 x Rear Lens Cap

-Fixed iris lens: 4mm6mm8mm -Manual vari facal lens -Motorised Zoom lens -Wide variety for varied applications

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Contact lens

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