# 2 questions

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#### iltriumph

##### New Member
Dear Guys,

1. Beside tucking in the arms and holding your breath for a second when taking shots, what other things should we take note, in terms of postures, to avoid blur pictures?

2. On the D70 Kit lens, it says 1:3.5 to 4.6 (or something like that). What does this means?

Thank you for replying

#### ipin

##### Senior Member
Dear Guys,

1. Beside tucking in the arms and holding your breath for a second when taking shots, what other things should we take note, in terms of postures, to avoid blur pictures?

Thank you for replying

#### iltriumph

##### New Member
Hey Longkangman, thanks for the link.

But i don't see any answer as to what 1:xx xx means leh

anyone with insights to share please?

thanks

#### ah.zeep

##### New Member
Hey Longkangman, thanks for the link.

But i don't see any answer as to what 1:xx xx means leh

anyone with insights to share please?

thanks
The 1:xx-xx notation you see on the lens is another way to express the max-min apertures of the lens. Hence longkangman's pointer to what "aperture" is all about.

I.e. the 1:3.5-4.5 marking on the lens means, f/3.5 (largest aperture @ wide end), to f/4.5 (largest aperture @ tele end).

HTH.

#### lastboltnut

##### Senior Member
Actually I dun know what does the 1:xx-xx doing there.....anyone can explain?

In case you dun get me, I am refering to just the "1:".

#### raptor84

##### Senior Member
Actually I dun know what does the 1:xx-xx doing there.....anyone can explain?

In case you dun get me, I am refering to just the "1:".
1: is the ratio of focal length to aperture size. Remember that the size of the aperture is always relative to the focal lenth given by ( focal length X (1/f-number) )

#### lastboltnut

##### Senior Member
Oic! Thanks.

1: is the ratio of focal length to aperture size. Remember that the size of the aperture is always relative to the focal lenth given by ( focal length X (1/f-number) )

#### Artosoft

##### Senior Member
2. On the D70 Kit lens, it says 1:3.5 to 4.6 (or something like that). What does this means?
They usually put: f/3.5-4.5. This is usual for zoom lens. It is mean at the most wide angle, the lens aperture is f/3.5, and at the most tele angle, the lens aperture is f/4.5. There IS fixed aperture zoom lens, like Nikkor 17-55mm f/2.8.

Regards,
Arto.

#### ah.zeep

##### New Member
They usually put: f/3.5-4.5. This is usual for zoom lens. It is mean at the most wide angle, the lens aperture is f/3.5, and at the most tele angle, the lens aperture is f/4.5. There IS fixed aperture zoom lens, like Nikkor 17-55mm f/2.8.

Regards,
Arto.
The literature may quote f/3.5-4.5, but it seems on all the Nikon lenses, they actually mark it 1:xx-xx. Didn't notice till now

#### iltriumph

##### New Member
Hi,

What does teh equation : focal lenght x (1 / f-number means ) means?

How and when do we apply this?

thanks

#### Rashkae

##### Senior Member
Hi,

What does teh equation : focal lenght x (1 / f-number means ) means?

How and when do we apply this?

thanks
That's pretty well explained about 100 times here so far and on the web as well. Simple answer: The size of your aperture.

#### iltriumph

##### New Member
uhh...

the fact that u are here means u are either an old bird or a newbie.

If u are a newbie, i'm thinking u should understand how us feel. We ask every questions that's no our mind.

If u are an old bird, and u bother to come to this section, why be upset with newbie types of questions?

formula like the one i asked can't be typed in the search section, hence i can't find that answer in this forum.

instead of giving this type of reply, why not be kind enough to provide a link instead? Us newbies will appreaciate that much better.

U see, as a newbie, sometimes we don't know what we know. For eg, we may have actually come across that knowledge (of the formula) in the web or this forum, but it didn't appear to be in that way (in the form of a formula)

#### lastboltnut

##### Senior Member
I am not new nor old....but still learning for sure....lets share:

http://en.wikipedia.org/wiki/F-number

uhh...

the fact that u are here means u are either an old bird or a newbie.

If u are a newbie, i'm thinking u should understand how us feel. We ask every questions that's no our mind.

If u are an old bird, and u bother to come to this section, why be upset with newbie types of questions?

formula like the one i asked can't be typed in the search section, hence i can't find that answer in this forum.

instead of giving this type of reply, why not be kind enough to provide a link instead? Us newbies will appreaciate that much better.

U see, as a newbie, sometimes we don't know what we know. For eg, we may have actually come across that knowledge (of the formula) in the web or this forum, but it didn't appear to be in that way (in the form of a formula)

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