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The 'mm' number printed on a lens is a measurement in millimeters of the focal length. This measurement is taken from the optical center of the lens to the camera's sensor when focused on infinity. So what's important to know is the focal length tells how much of the scene your camera will be able to capture.

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Tra i fasti di quei primi anni di attività si ricorda nel 1925 la visita di Gabriele D’Annunzio, che coniò quello che a partire dal 1935 divenne il motto ufficiale dell’associazione: “Perseverando arrivi”. Tra i primi e indimenticati campioni invece bisogna citare Azelio Mondini, vogatore dal 1937 agli anni Cinquanta, e il suo discepolo Marco Penna, che partecipò a quattro Olimpiadi. Tra i velisti anche vi furono talenti straordinari, e qui bisogna citare il sei volte campione del Mondo Andrea Bonezzi, così come tra i tuffatori, e qui bisogna citare Francesco Priori, che tra il 1986 e il 1996 ha vinto tutti i titoli italiani.

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The main difference in focal lengths is the magnification of your subject. For example, a wide-angle lens/short focal length (under 50mm) is good for taking in the broad span of a landscape, from near to far. They are good for when you want to take in more of a scene.

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Le vittorie non si fecero attendere: la prima venne conseguita proprio nell’anno di istituzione, in una regata di resistenza per lancia a sei vogatori. Tante altre ne seguirono, seppure durante le guerre vi furono necessariamente dei periodi di stasi.

A telephoto lens/long focal length (over 50mm) is good for bringing wildlife up close while allowing you the distance from your subject. Longer focal lengths are also good for portraits and sports.

Tuttora i suoi ambienti conservano un fascino antico, il ricordo delle eleganti regate di fine Ottocento. Allo stesso tempo – diversamente da altri spazi che furono brillanti nuclei di socialità “nei bei giorni andati” – restano un presidio decisamente contemporaneo, vivo e propositivo ritrovo per tantissimi sportivi. Mentre una volta si veniva qui per infilarsi nelle barche e mettersi alla prova in gare e allenamenti a filo d’acqua, oggi oltre al canottaggio sono innumerevoli le discipline che si possono praticare. A disposizione dei soci ci sono tre piscine, di cui una olimpionica e una col trampolino per i tuffi, una palestra, nove campi da tennis, un campo da basket, due campi da calcio. Non mancano le aree dedicate al relax e al ristoro, i lettini per prendere il sole, il chiosco e il ristorante. Abbraccia e ombreggia il complesso il grande parco affacciato sul lago. Qui crescono pioppi bianchi, farnie, platani, frassini di diverse varietà, tigli, aceri ricci, peri e olmi.

Another important factor: The focal length of a lens is affected by the size of the camera's image sensor. All lenses are measured off the full-frame sensor. If you have an APS-C camera or micro 4/3'rds, these cameras have smaller sensors, so check the crop factor. It could be 1.5x for Nikon DX, Sony, Pentax, Fuji, 1.6x for Canon, or 2.0x for micro 4/3. To figure, take the mm of the lens multiplied by the crop factor. This then equals the effective focal length. 28 mm x 1.5 crop factor = 42 mm effective focal length. A crop sensor camera basically crops your scene in camera, giving the impression of using a longer focal length.

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Remembering years back, a Nikon F2 I bought; came with a 50 mm lens. At the time, a very popular focal length because of its normal field of view, which is close to what your eye sees. And that's as far as my knowledge went of that lens. However, it didn't take me long to realize the importance of what mm meant and how it played into my photography.

La Canottieri Mincio si è imposta a livello nazionale e internazionale come una florida fucina di coppe e medaglie, che ha meritato nel 1975 alla Canottieri la Stella d’oro al merito sportivo.

Longer focal lengths appear to bring the background closer to the foreground, compressing the scene. Shorter focal lengths appear to increase the space between objects. But changes in perspective and relationship between objects in the scene are also affected by the distance we stand from our subject.

Definition: f-stop ... (Focal-STOP) The f-stop is the "aperture" opening of a camera lens, which allows light to come in. It also determines how much is in focus ...

Venne da subito pensata per accogliere sia uomini che donne. I soci si distinguevano in ordinari, straordinari e allievi e – stando al primo regolamento – gli sportivi affiliati erano tenuti a indossare una ben dettagliata divisa: calzoni bianchi, maglia di lana con lo stemma di Mantova e la scritta “Delectando Iuvat”, un sacchetto di panno e un berretto blu.

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Fu costituita nel 1883, tuttavia si trovano notizie del club già nella cronaca locale di qualche anno precedente. Si leggeva nel 1881 che ormai tutta Mantova era a conoscenza di questo nuovo sodalizio, nato “col nobile scopo di utilizzare i bei laghi che circondano la città e che tante altre le invidierebbero, di animarli con frequenti ed eleganti battelli, di offrire un sano e ginnastico passatempo alla gioventù”.

As you see, there are a number of factors to consider when deciding on the 'mm' of a lens for your camera and why it's important to your photography. The wide range of focal lengths available on either side of the 50 mm's normal field of view has different purposes, affecting quite a bit of the final image, each having its own distinct impact on a scene, achieving different looks. It is really up to you to decide which focal length will give you a look that meets your vision and creativity.

A few more things I think are worth noting when choosing and using a lens.* Knowing the minimum close focus distance. A wide angle can focus within inches, whereas a telephoto may close focus at 3 feet or more.* Hyperfocal distance is partially determined by focal length. * Filter size will not be the same as the mm of the lens and will be different from lens to lens.* The longer the focal length, the harder it is to keep it steady. The shutter speed for a handheld should be at least twice the focal length - 50mm = 1/100 sec, etc. * Zoom lenses are a grouping of different focal lengths as opposed to the single focal length, also known as a prime lens.* How a crop sensor affects the effect of the lens. * Apply the 500 rule for astrophotography to eliminate star trails. 500 divided by the focal length = exposure time. 500/24mm = 21 seconds.

This can mean that several components may be required to get the desired result. The non-spherical surface of an aspheric lens allows a ...