(Fwd) Nikon - Dot or no dot ?

[danzig@xxxxxxxxxxxxxx]

Forwarded message:
From:     Self <Single-user mode>
To: infrared@xxxxx
Subject: Nikon - Dot or no dot ?
Date: Tue, 8 Jun 1999 03:35:25 +0800

>I have a Nikon Macro 60mm D 2.8f and 24mm D 2.8f lens
> and I don't think either has a red dot for focus compensation in 
>infrared -  From Kevin 


Don't worry mate ;) 

>This topic, especially the macro-aspect, could keep optical 
>engineers talking for hours, without any hard rules for your 
>specific lens, so ... from WJ


Actually WJ, I BEG to differ ;) 

For Nikon users there's no need to discuss things for hours on end. 
I don't know about brand C users like you ; P maybe they don't 
look after you guys so well, they DID put an infrared film counter in 
their bodies ;)

Kevin, Nikon lenses do NOT have a red IR focussing dot.


But they do have a WHITE one. Go look at your lens barrel, there 
should be a white dot on the barrel just beside a long white stripe, 
should look like this 

o  |

Focus on your subject, the stripe represents visible light focus.  
Move the focussing ring by the distance that lies between dot and 
the stripe ( works better if you actually mark the area on the 
focussing ring directly in front of the stripe, so you know exactly 
how much to move the focussing ring  ) Move it that distance 
towards the dot . That is the correct focus for IR. 

On zoom lenses, there will be a range on the lens barrel, indicating 
the zoom length of the lens barrel, say a 28-70 lens, the lines will 
have 2 markings, one for 28 & another for 70 , if you used any 
zoom length in between , you'd have to do some guesswork, but 
the principal is still the same. One way around it is to use only the 
wide & long end of the lens.  


Hope this helps :)


Yours sincerely,
 Ket

The longer you live, the less sure you are of the way.
Ket
Email me at: danzig@xxxxxxxxxxxxxx
I am PGP 5.0 enabled; please email me for my public key
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