Viewfinder : Details of Optical Viewfinder of a Camera

Viewfinder is the most important and possibly the most correct way to determine the composition of a Photo that to be taken. The optics of Viewfinder varies. We named the article as Details of Optical Viewfinder of a Camera as an article on Pentaprism Viewfinder has been published before, which is actually a component of viewfinder of a DSLR or Film SLR Camera.

Brief general details of Viewfinder

The basic optical factor is – in most low end cameras,the viewfinder is separate from the lens. This creates a big difference for proper composition of the image. To circumvent this optical parallax, SLR (that is why it is Single Reflex Camera) were designed. It was not only the reason, but it was quite important reason. Live view through LCD panel for lowend digital cameras are a kind of cheat sheet most commonly used by the manufactures to reduce the error generated due to parallax error.

Types of Optical Viewfinder

Only Viewfinders can be a factor that can determine the price of a camera’s total cost.

Simple reflecting viewfinders are not used today, they had bigger sized viewfinders with mirror arrangement. Particularly used on Kodak’s famous $1 Box Camera. Sports viewfinder has also been abandoned. Twin-lens reflex viewfinders are mentionable as they were a hugely big optical system with mirror arrangement inside.

Direct optical viewfinder is actually the better form of today’s cheaper consumer grade camera’s typical body mounted viewfinder. Optically these viewfinder are actually a reverse telescope. Rangefinder camera had the technology of direct optical viewfinder, but had additional features.

The main technology of viewfinder was and is Single-lens reflex viewfinder. Those type of viewfinder typically used for DSLR camera’s now. In our Digital single-lens reflex camera article, we wrote about DSLR camera’s optical function with a cut section diagram.

The above official diagram shows, how complex a top notch DSLR’s viewfinder has been, both optically and electronically. Most viewfinder mounted on DSLR has the function to correct simple defects of vision like the photographers who have plus or minus lens, can use the camera’s viewfinder without using the spectacle. However, complex optical errors of vision can not be corrected and one will need to use spectacles.

Most thankfully sports a good soft rubber to protect the lens of the spectacle, this is quite good point as an user of most costly spectacle lens available, unfortunately is susceptible to get scratch from quite costly microscope’s objective even from Olympus, which reminds of a DSLR’s thankfully good padding of their viewfinder by its absence on objective piece.

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