A stupid lens quiestion

[Alex]

Hi all,

This is a stupid question, but as someone who's never used anything but the kit lens and 70-300 G I am a bit puzzled.

I just purchased a 2nd hand Nikkor AF 28mm 2.8f lens. I see aperture and focust rings and I understand how they function.

Just where the window with distances is there is a bar, which I guess needs to coincide with the aperture ring settings to show aperture (with D70 not required as f is controlled by d70 itself). To the left of the bar is a dot (I guess this needs to be matched with the distance numbers for maual focusing).

My question, however is: What do the aperture(?) numbers 22 16 11 to the either side of the bar represent and what is their function (if any). I know it's probably a very basic question for someone, but I never had a lens like that.

Thanks in advance....

Alex

P.s. a hell of a quesiton for someone with a 'senior member' status

[spartikus]

From what I know, you have to set the aperture as wide open as possible with the ring i.e. 22 on the scale, and then the D70 will take care of everything else. This is certainly the case with some older lenses, my D70 just spews out errors otherwise.

Could be wrong though, anyone else?

[genji]

My question, however is: What do the aperture(?) numbers 22 16 11 to the either side of the bar represent and what is their function (if any). I know it's probably a very basic question for someone, but I never had a lens like that.

Thanks in advance....

Alex

P.s. a hell of a quesiton for someone with a 'senior member' status

Alex

the 11, 16, 22 are aperture numbers relating to DOF, ie when you set the apeture to f11 and focus on an object, look at the distance marker and the distance between the 16 is the distance in focus

cheers
tai

[Alex]

My question, however is: What do the aperture(?) numbers 22 16 11 to the either side of the bar represent and what is their function (if any). I know it's probably a very basic question for someone, but I never had a lens like that.

Thanks in advance....

Alex

P.s. a hell of a quesiton for someone with a 'senior member' status

the 11, 16, 22 are aperture numbers relating to DOF, ie when you set the apeture to f11 and focus on an object, look at the distance marker and the distance between the 16 is the distance in focus

cheers
tai

Alex

Thanks guys.

Tai. This is very useful. It's like a manual DOF preview. Thanks very much. It's clear now.

Alex

[krpolak]

Going futher into primes you can find Hyperfocal Distance as an usefull tool. However with AF lenses I don't use it that much. Uselly I choose my focusing point keeping in mind chosen apperture and in consequence DOF. Once I got focus right I compose my framing.

More details about Hyperfocal can be found here:

http://www.dofmaster.com/hyperfocal.html#focusing

Have fun with primes Alex

Regards,

K.Polak

[MattC]

This article could be useful.

http://www.luminous-landscape.com/tutor ... /dof.shtml

Cheers

[Doughnut]

<snip>
To the left of the bar is a dot (I guess this needs to be matched with the distance numbers for maual focusing).
<snip>

Hi,
I may be wrong here but I think this dot is the Infra-Red compensation index.

Cheers,
Edward

[Alex]

<snip>
To the left of the bar is a dot (I guess this needs to be matched with the distance numbers for maual focusing).
<snip>

Hi,
I may be wrong here but I think this dot is the Infra-Red compensation index.

Cheers,
Edward

Hmm.. sorry. What does IR compensation index do?
Thank you

Alex

[MattC]

Hmm.. sorry. What does IR compensation index do?
Alex

It is used to compensate the focus for black and white infrared film.

How it works, I have no idea.

Cheers

[Alex]

Going futher into primes you can find Hyperfocal Distance as an usefull tool. However with AF lenses I don't use it that much. Uselly I choose my focusing point keeping in mind chosen apperture and in consequence DOF. Once I got focus right I compose my framing.

More details about Hyperfocal can be found here:

http://www.dofmaster.com/hyperfocal.html#focusing

Have fun with primes Alex

Regards,

K.Polak

Thanks for the link, Krystian. Looks interesting.

Cheers
Alex

[Alex]

Matt,

Thanks for the link.

Cheers
Alex