Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
06-27-2012, 09:59 PM   #1
New Member




Join Date: Jan 2012
Posts: 15
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 ?

Attached Images
 
06-27-2012, 10:10 PM   #2
Veteran Member
lammie200's Avatar

Join Date: Jun 2011
Location: San Francisco
Photos: Albums
Posts: 1,028
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
Senior Member
pezmaker's Avatar

Join Date: Jul 2011
Location: Madison, WI
Photos: Gallery | Albums
Posts: 276
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
Pentaxian
Arjay Bee's Avatar

Join Date: Sep 2006
Location: Bamaga, QLD
Photos: Gallery | Albums
Posts: 3,023
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
Veteran Member
selar's Avatar

Join Date: Jul 2007
Location: Sydney, Australia
Photos: Gallery | Albums
Posts: 2,035
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
Moderator
Site Supporter
photolady95's Avatar

Join Date: May 2009
Location: Cruising PentaxForums and watching your back.
Photos: Gallery | Albums
Posts: 9,519
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
Site Supporter
mikeSF's Avatar

Join Date: Jan 2009
Location: East Bay Area, CA
Photos: Gallery
Posts: 5,683
i miss that thing on the modern lenses; makes it easy to change lenses in the dark.
06-27-2012, 11:27 PM   #8
Veteran Member
selar's Avatar

Join Date: Jul 2007
Location: Sydney, Australia
Photos: Gallery | Albums
Posts: 2,035
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
Veteran Member
selar's Avatar

Join Date: Jul 2007
Location: Sydney, Australia
Photos: Gallery | Albums
Posts: 2,035
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
Senior Member
Pontax's Avatar

Join Date: Oct 2011
Location: Bornholm
Photos: Gallery | Albums
Posts: 160
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
Veteran Member




Join Date: Dec 2010
Location: Manila
Photos: Gallery | Albums
Posts: 2,190
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
Veteran Member
selar's Avatar

Join Date: Jul 2007
Location: Sydney, Australia
Photos: Gallery | Albums
Posts: 2,035
I see it on my my FA77 and FA31 but not on the FA20.
06-28-2012, 01:00 AM   #13
Veteran Member
selar's Avatar

Join Date: Jul 2007
Location: Sydney, Australia
Photos: Gallery | Albums
Posts: 2,035
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
Senior Member




Join Date: Sep 2009
Location: Beautiful Bavaria :-)
Posts: 123
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
Veteran Member




Join Date: Dec 2010
Location: Manila
Photos: Gallery | Albums
Posts: 2,190
I guess the FA Limiteds really are the holy trinity of Pentax K-mount in more ways than one, hmm....
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
k-mount, lens, node, pentax lens, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Which is the prime lens? normhead Pentax SLR Lens Discussion 21 03-14-2011 09:23 AM
For Sale - Sold: Prime Lenses--Macro Lens--Zoom Lens for Sale (CONUS) stl09 Sold Items 16 01-14-2011 04:53 PM
Next Prime lens? kpfeifle Pentax SLR Lens Discussion 17 07-08-2010 05:30 AM



All times are GMT -7. The time now is 10:33 AM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top