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LiamA. · 10-30-2016, 02:01 PM

Hi, I was just wondering if anyone could help me identify a mark on one of my lenses?

(P.S. I know it's dusty)

Attached Images

**sergysergy** · 10-30-2016, 02:50 PM

it looks like fungus

stevebrot · 10-30-2016, 04:36 PM

Welcome to the Pentax Forums!

It is difficult to say without knowing the history of the lens just what the mark is. Did this just "appear" overnight or is it how a recent purchase looked out of the box? It is also somewhat difficult to say from a straight-on view. My first impression is that the rear surface of the front element had a close encounter with something like this:

Steve

LiamA. · 10-30-2016, 11:39 PM

Originally posted by stevebrot

Welcome to the Pentax Forums!

It is difficult to say without knowing the history of the lens just what the mark is. Did this just "appear" overnight or is it how a recent purchase looked out of the box? It is also somewhat difficult to say from a straight-on view. My first impression is that the rear surface of the front element had a close encounter with something like this:

Steve

I'm not sure when the mark appeared, the lens has been in storage for quite some time.

tom1803 · 10-31-2016, 12:30 AM

Originally posted by LiamA.

I'm not sure when the mark appeared, the lens has been in storage for quite some time.

If it wasn't there when you packed it, and no one has touched it since then, and now there's some marks inside the lens, definitely suggests that it's a fungus.

LiamA. · 10-31-2016, 02:05 AM

Originally posted by tom1803

If it wasn't there when you packed it, and no one has touched it since then, and now there's some marks inside the lens, definitely suggests that it's a fungus.

OK thanks.

Sagitta · 10-31-2016, 06:46 AM

Originally posted by LiamA.

OK thanks.

Luckily those lenses are stupidly cheap to replace - do a search for the Auto Sears 50/f2 on fleaBay and you can probably get the exact same thing (rebadged as a department store lens) for under $10 to $20.

Or you can use this as an excuse to buy the DA50 and gain a half a stop along with modern coatings and autofocus.

10-30-2016, 02:01 PM	#1
LiamA. New Member Join Date: Oct 2016 Photos: Gallery Posts: 3	Unidentified Mark on Lens Hi, I was just wondering if anyone could help me identify a mark on one of my lenses? (P.S. I know it's dusty) Attached Images

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10-30-2016, 02:50 PM	#2
sergysergy Site Supporter Join Date: Jan 2011 Photos: Gallery Posts: 5,175	it looks like fungus

10-30-2016, 04:36 PM	#3
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	Welcome to the Pentax Forums! It is difficult to say without knowing the history of the lens just what the mark is. Did this just "appear" overnight or is it how a recent purchase looked out of the box? It is also somewhat difficult to say from a straight-on view. My first impression is that the rear surface of the front element had a close encounter with something like this: Steve

10-30-2016, 11:39 PM	#4
LiamA. New Member Join Date: Oct 2016 Photos: Gallery Posts: 3 Original Poster	Originally posted by stevebrot Welcome to the Pentax Forums! It is difficult to say without knowing the history of the lens just what the mark is. Did this just "appear" overnight or is it how a recent purchase looked out of the box? It is also somewhat difficult to say from a straight-on view. My first impression is that the rear surface of the front element had a close encounter with something like this: Steve I'm not sure when the mark appeared, the lens has been in storage for quite some time.

10-31-2016, 12:30 AM	#5
tom1803 Veteran Member Join Date: Feb 2010 Location: Kokubunji, Tokyo Photos: Gallery Posts: 465	Originally posted by LiamA. I'm not sure when the mark appeared, the lens has been in storage for quite some time. If it wasn't there when you packed it, and no one has touched it since then, and now there's some marks inside the lens, definitely suggests that it's a fungus.

10-31-2016, 02:05 AM	#6
LiamA. New Member Join Date: Oct 2016 Photos: Gallery Posts: 3 Original Poster	Originally posted by tom1803 If it wasn't there when you packed it, and no one has touched it since then, and now there's some marks inside the lens, definitely suggests that it's a fungus. OK thanks.

10-31-2016, 06:46 AM	#7
Sagitta Veteran Member Join Date: Feb 2011 Location: Maine Photos: Gallery Posts: 3,081	Originally posted by LiamA. OK thanks. Luckily those lenses are stupidly cheap to replace - do a search for the Auto Sears 50/f2 on fleaBay and you can probably get the exact same thing (rebadged as a department store lens) for under $10 to $20. Or you can use this as an excuse to buy the DA50 and gain a half a stop along with modern coatings and autofocus.

Unidentified Mark on Lens

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