Panasonic Lumix Camera Review

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As any one who owns a digital single lens reflex camera will attest lenses can be quite an investment. Lenses that are optimized for digital scheme an image onto the camera sensor with high contrast, good color and sharp focus. As photographers we truly do get a lot for our money when we purchase a lens. So why do we then install a regular old filter instead of one made to match the lenses visual quality?

I mentioned digitally optimized lenses before, but just what does that mean? While these lenses have several features that make them especially well great to digital photography one of the main benefits lies in the coatings applied to the glass of the lens. Proper lenses have coating applied to approximately every internal and external covering yet they tend to only have an anti-reflective coating on the covering covering of the front element only. Digital lenses have the anti-reflective coating applied to all surfaces of the glass and this is a key component.

The image sensors used inside digital cameras is very polished and reflective. This isn't a organize flaw, it's the only way they can be made in order to achieve sharp and focused images. Unfortunately it's the very reflectivity of the sensor that causes imaging problems.

As light from our branch passes through the camera lens it focuses on the image sensor. But because the sensor is so reflective some of that light bounces back up through the lens. Older lenses or those not digitally optimized lack the anti-reflective coatings on the back sides of the glass elements. The light that has bounced off of the image sensor strikes these uncoated elements and reflects once again back down to the image sensor. This twice reflected light is now out of focus and causes ghosting and loss of contrast in our image.

We can see that if the lens is made with anti-reflective coatings on the backsides of the elements that we can eliminate a critical source of image ruining stray light. The same principle applies to lens filters. It's difficult to find a filter without coatings; all of them in fact are coated in one way or another. Any way like the lenses just discussed Proper filters lack the coatings on the backside of their glass.

Filters optimized for digital cameras have anti-reflective coatings on the back side of the glass element. Our digital lenses do a great job of not bouncing back reflected light to our camera's sensor, filters made for digital faultless the job and allow the camera to capture the very best image.