There seems to be a fundamental miss understanding that some how the focal length of a lens represents its physical length.

What isfocal lengthin photography

This amounts to having a design where a reversed telephoto lens is placed at the back of elements to allow a wide-angle lens to be built for a large sensor.

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What isfocal lengthof lens

This Nikon 17-35mm is designed to fit on a compact digital (DX) with a format that measures 16mm height by 24mm length. The corner to corner measure of this rectangle is approximately 30mm. In other words, a 30mm on your camera delivers a “normal” view.

a telephoto lens is a specific type of a long-focus lens in which the physical length of the lens is shorter than the focal length.

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Focal lengthexamples

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Long focal lengthcanon

The ‘buck’ is one of the classic cocktails categories and, although there are many variations on the theme, the term is used to describe any cocktail that combines ginger ale or ginger beer, citrus juice and a base spirit.

Such a close lens positioning is virtually impossible, not enough room for lens barrel, glass, mount, aperture and other stuff. What to do? The optician must shift the rear nodal more to the rear. Normally it would fall somewhere within the lens barrel. This shift can be extreme, it could be made to fall in the air behind the lens. This design elongates the back focus distance; now there is room for everything. This is accomplished by inserting several lens elements, some with positive power and some with negative power. The correct combination resembles an inverted telephoto. This is known as a retro-focus lens. Such a lash-up is how you get a 17-35mm zoom to fit on a DX camera.

The focal length of a lens refers to the distance it sees or its field of view and is not a reference to its physical size. Although a longer focal length telephoto is physically longer then a shorter focal length lens, the physical length of the lens is not equal to the focal distance number. I.E. a 400 mm lens is not physically 400 mm long. How does one "accidentally" see a lens?

The retrofocus lens solves this proximity problem through an asymmetrical design that allows the rear element to be farther away from the film plane than its effective focal length would suggest.

I accidentally saw Nikon 17-35mm f/2.8 lens and noted that it is rather large for its focal length. Here's the first review of this lens search offered - looks like it's 107 millimeters long. Given its focal length of up to 35 millimeters I would expect it to be more like a pancake lens but 107 millimeters is very far from pancake lens.

Long focal lengthphotography

The global thirst for ginger-based drinks can be dated back to medicinal tonics originating in eleventh-century China. In this article we explore how ginger has been used in beverages throughou...

Founded by two brothers from Suffolk, our cocktails are all poured, mixed, bottled and labelled by hand, less than 15 minutes from home.

Shortfocal length

The focal length of the camera lens defines its fundamental property. We are talking about such things as angular field of view, relative aperture, depth of field and depth of focus. It is customary to fit lenses to cameras that have a focal length approximately equal to the diagonal measure of the format. Such a lash-up delivers a “normal” angle of view. If the lens mounted is shorter than the diagonal, the angle of view will be wide-angle.

In many ways, ginger beer feels like an old-fashioned, beverage with limited application as a mixer, due to its strident flavour. But it does have the ability to add a powerful kick to any cocktail.

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Focal lengthof lens formula

We exclusively use the best spirits and liqueurs available, and use at least a double measure in every cocktail. Just like your favourite bar.

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We all know the deal with Hollywood musicals. Unlike in real life, even the most potentially mundane of moments becomes an opportunity to break into song.

If you're vegan or catering a party for vegan guests this festive period, you may want to plan your drinks menu accordingly. Here are a few suggestions for festive vegan cocktails.

Long focal lengthin mm

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The global thirst for ginger-based drinks can be dated back to medicinal tonics originating in eleventh-century China. In this article we explore how ginger has been used in beverages throughou...

We all know the deal with Hollywood musicals. Unlike in real life, even the most potentially mundane of moments becomes an opportunity to break into song.

The focal length of a lens is a measurement taken when the lens is focused on a far distant subject. We measure from a point called the rear nodal to the focused image which will be the surface of the image sensor. When a wide-angle lens is mounted such as this this one, set to 17mm, the rear nodal must be positioned 17mm from the imaging chip. This is a super short distance, only about ¾ inch.

If you’re planning a festive party this season, consider creating a signature Christmas cocktail to wow your guests. Here are a few of our favourites.

Our cocktails are made for shaking or stirring like they do in the movies, and come with perfect garnishes to complete the experience.

In many ways, ginger beer feels like an old-fashioned, beverage with limited application as a mixer, due to its strident flavour. But it does have the ability to add a powerful kick to any cocktail.