Wholesale Cameras

The thing which confuses most people is that lenses for digital cameras are quite different from the older, and perhaps more familiar, 35mm cameras. The reason for this is that digital cameras, especially Single Lens Reflex (SLR) cameras, have sensors much smaller than traditional cameras. For example, the diagonal of most sensors is almost twice as small as 35mm film!

Now if you were using a regular 35mm lens on a digital camera, the smaller sensor would capture only the middle portion of the projected image. This will effectively crop the image, so you will need a lens with a larger focal length to create the same effect. We use the term ‘Focal Length Multiplier’ (or FLM) to convert between digital and 35mm format. For example: a Digital telephoto 200mm lens with a FLM of 1.5 is equivalent to a super-telephoto 300mm (200 x 1.5) lens on a 35mm film.

The better digital SLR cameras are able to use conventional 35mm lenses. Besides the problem with image size, these older lenses are significantly heavier than there digital equivalents.

In the pre-digital world, names such as Karl Zeiss were famous the world over for high quality lenses. You still get these brands today, but they are probably over-rated and certainly don’t justify there high price-tag. Brands such as Canon and Nikon are getting a superb reputation for high quality digital lenses. These lenses also have features which are particularly useful for digital photographers, features such as auto-focus and vibration reduction.

Cleaning Digital Camera lenses is no different to cleaning the lenses of regular cameras: you can purchase a purpose-built lens cleaning kit from camera stores or online at ebay or amazon. Alternatively, use a cotton swab with some alcohol. Clean in a circular motion, and don’t apply too much pressure.

Finally, we consider repairing or maintaining lenses. The most common problem is removing scratches on lenses. Follow these steps: dismantle lens and each lens element, locate the scratch, you might get away with a simple repolish , otherwise you’ll need to reground or replace it, reassemble the lens. You might also need to Relaminate the lens grouping.