Forum: Photography


Subject: The mm thing

PeeWee05 opened this issue on Nov 04, 2005 ยท 5 posts


PeeWee05 posted Fri, 04 November 2005 at 7:39 AM

Blonde momment again... Can someone explain to me how x12 zoom can be 426mm that like 4.26cm... I don't get it Argh, help.

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Onslow posted Fri, 04 November 2005 at 10:52 AM

Lenses can get very confusing with all the different ways of saying what it is or does, but I'll try an explain. The 426mm refers to the length of the lens if it were on a 35mm film camera. Many makers give this equivalent length as a reference point for people because 35mm film cameras were the most common type in use until recently. The actual length of the lens varies according to the size of the sensor inside the camera, so for compact cameras it can be far less than 426mm and still be the equivalent of a 426mm long lens. The 12X zoom refers to the number of times the lenses shortest length is multiplied to get its longest length. So in this case 35.5mm. ( 35.5 X 12 = 426 ) The 35.5mm is an equivalent length too and the actual lens on the camera will not be 35.5mm long but much shorter. Hope this helps :)

And every one said, 'If we only live,
We too will go to sea in a Sieve,---
To the hills of the Chankly Bore!'
Far and few, far and few, Are the lands where the Jumblies live;
Their heads are green, and their hands are blue, And they went to sea in a Sieve.

Edward Lear
http://www.nonsenselit.org/Lear/ns/jumblies.html


3DGuy posted Fri, 04 November 2005 at 2:43 PM

Actually.. 426mm = 42,6cm.. 1cm=10mm

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Zacko posted Fri, 04 November 2005 at 3:23 PM

Hey blondie...heres a little spellcheck for ya: "MOMENT"....la la la la... tongue.gif...psssst...you set the bar Vera...remember? LOL.

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PeeWee05 posted Mon, 07 November 2005 at 12:50 AM

yes being blonde is fantastic you can make mathematical and spelling errors and are forgiven!!! :D Tx Onslow, it's still not clear to me but the general idea is starting to paint a picture or develop ;)

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