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06-27-2012, 09:59 PM   #1
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What is the white node on the lens M Prime. Why has it ? .

I have prime lens M28 f2.8 and M50 f2 there are a white node on lens .
What is it ? and Why has it ?

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06-27-2012, 10:10 PM   #2
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QuoteOriginally posted by dasboot88 Quote
I have prime lens M28 f2.8 and M50 f2 there are a white node on lens .
What is it ? and Why has it ?
I think that it just gives you a little grip if you are rotating the aperture ring when the lens is not attached to a camera.
06-27-2012, 10:12 PM   #3
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My camera and lenses are at home so I can't confirm 100%, but if I recall correctly it allows you to find the lens release switch by touch - on film cameras, this should line right up with the release switch once the lens is secured. On my K200d it's a little off though.
06-27-2012, 10:15 PM   #4
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It is a feature that allows you to locate the correct orientation of the lens for clipping onto the body in the dark without looking. More a pale green than white - it is also possibly photo luminesant

Close your eyes and try to attach while camera is hanging from neck strap - easy eh?

06-27-2012, 10:18 PM   #5
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Its a little storage container for pixie dust, and injects it into the lens in the right amounts to mix it with the light beams when you take a photo.

(Okay thats not the right answer, but seeing as 2 other people posted the right answer while I was typing, I thought up a different response :-).

Last edited by selar; 06-27-2012 at 10:31 PM.
06-27-2012, 10:54 PM   #6
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QuoteOriginally posted by selar Quote
Its a little storage container for pixie dust,
So that's where the magic comes from for M lenses, eh?
06-27-2012, 10:59 PM   #7
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i miss that thing on the modern lenses; makes it easy to change lenses in the dark.

06-27-2012, 11:27 PM   #8
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QuoteOriginally posted by photolady Quote
So that's where the magic comes from for M lenses, eh?
Yup, and no magic in the DA lenses!
06-27-2012, 11:36 PM   #9
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QuoteOriginally posted by pezmaker Quote
My camera and lenses are at home so I can't confirm 100%, but if I recall correctly it allows you to find the lens release switch by touch - on film cameras, this should line right up with the release switch once the lens is secured. On my K200d it's a little off though.
It only lines up with the lens lever on film cameras, doesn't line up with K200D and other dSLRs now as the lens release button position was changed. Thats one of the reasons why the plastic button is not present on DA lenses.
06-27-2012, 11:58 PM   #10
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Leica has a red dot, Pentax M primes has a white dot, I think I have seen a green and yellow dot on a lens but I don't remember which. A lens trend from the past?
06-28-2012, 12:32 AM   #11
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I don't see the node on my FA lens too so, probably it went out when AF lenses went in?
06-28-2012, 12:56 AM   #12
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I see it on my my FA77 and FA31 but not on the FA20.
06-28-2012, 01:00 AM   #13
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QuoteOriginally posted by Pontax Quote
Leica has a red dot, Pentax M primes has a white dot, I think I have seen a green and yellow dot on a lens but I don't remember which. A lens trend from the past?
The FA limiteds have a green dot.
06-28-2012, 01:07 AM   #14
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QuoteOriginally posted by Alizarine Quote
I don't see the node on my FA lens too so, probably it went out when AF lenses went in?
The F series AF lenses still do have a little knob at the same position, the FA lenses don't have it anymore. Only the 3 FA limiteds revived that nifty feature, but in really silly colours. My black FA 77 has a green bulb...

Personally, I use the knob much more often to attach a lens then the red dots... Just align the bulb and the lens release knob and attach it.

Unfortunately, the recent digital bodies have moved the lens release knob a little bit downwards. It still works, but not as precise as before.
06-28-2012, 01:13 AM   #15
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I guess the FA Limiteds really are the holy trinity of Pentax K-mount in more ways than one, hmm....
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