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07-29-2007, 06:00 PM   #1
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What's that yellow blob..

On the older Pentax lenses there is a yellow blob that sticks up between the aperture and focussing rings. What is it for?

eg.- https://www.pentaxforums.com/lensreviews/showfull.php?product=129&bigimage=IMGP1117.jpg

07-29-2007, 06:05 PM   #2
Ed in GA
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QuoteOriginally posted by Arpe Quote
On the older Pentax lenses there is a yellow blob that sticks up between the aperture and focussing rings. What is it for?

eg.- https://www.pentaxforums.com/lensreviews/showfull.php?product=129&bigimage=IMGP1117.jpg

It's there so that you can line up your lens without having to look. when that little knob is immediately adjacent to the lens release button, the lens is lined up with the bayonet mount. However. on my lenses, it white.
07-29-2007, 06:17 PM   #3
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Ah! So it's like the red dot! thanks, hadn't noticed that.
07-29-2007, 06:25 PM   #4
Ed in GA
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QuoteOriginally posted by Arpe Quote
Ah! So it's like the red dot! thanks, hadn't noticed that.

Yep, just another little thing that's gone from the lens. You, know.. Things such as the aperature ring and the DOF scale.

07-29-2007, 07:58 PM   #5
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Thanks for asking Arpe. I've often wondered, but never thought to post an inquiry here.
Chris
07-29-2007, 07:58 PM   #6
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So thats what it is! haha. I always though it was something to help you grip the lens as you twist to mount/unmount the lens.

Yea, the Dof scales and the aperture ring were really useful. Its really too bad Pentax went the way of the other big companies and nerfed it to save cost.
07-30-2007, 12:08 AM   #7
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I read once that some of them glow in the dark, making it easier to line up in necessary.

My old Sigma 75-300 has something like it as well in the same place.
07-30-2007, 01:13 AM   #8
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QuoteOriginally posted by little laker Quote
I read once that some of them glow in the dark, making it easier to line up in necessary.
I'd often wondered that too, as it's that sort of colour - have to give it a try.

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