Help with abnormality on lens

Unregistered User · 01-24-2019, 05:45 AM

so, why didn't it show up with other lenses?

Not a Number · 01-24-2019, 05:48 AM

Okay, so the drop(s) of oil act as a lens which interact differently depending on the focal length and f-stop. I can see that. A good look at the sensor with a the aid of a flashlight / torch probably would have revealed the drops.

Definitely better left to a professional to clean.

Glad all is well now.

blind-bat · 01-24-2019, 08:47 AM

Originally posted by Paul the Sunman

Wow, I've not heard that one before. I said it looked like a liquid drop, but I didn't consider oil!

Enjoy your new clean sensor.

Use of compressed air cans to clean sensor????

Paul the Sunman · 01-24-2019, 01:21 PM - **1 Like**

Originally posted by blind-bat

Use of compressed air cans to clean sensor????

NO, NEVER! They are full of particles. Use a rocket blower in a clean environment.

---------- Post added 25-01-19 at 07:22 AM ----------

Originally posted by dlh

so, why didn't it show up with other lenses?

Because he shot the other lenses at f/4.

blind-bat · 01-24-2019, 01:30 PM

Originally posted by Paul the Sunman

NO, NEVER! They are full of particles. Use a rocket blower in a clean environment.

---------- Post added 25-01-19 at 07:22 AM ----------

Because he shot the other lenses at f/4.

Wasn't suggesting use of, merely mentioning that the OP or whoever had the lens before him may have & the force of the air would be enough to dislodge lubricant.

Bethor · 01-25-2019, 01:21 PM

I bought all the lenses brand new and I never used compressed air on them.

I want to blame my 77 limited for the oil. I feel that the oil really started showing after I started using that lens more often, also I use it up to f5.0 and I never noticed it until I started doing some real estate work that required me to use f9 - f11 on a different lens.

However, all that aside I’m just excited that it was something simple. The place I went was really professional and very knowledgeable so I’ll be using them again.

As always, everyone here rocks for insight and advice!

**Digitalis** · 01-27-2019, 06:11 AM

Originally posted by Bethor

I want to blame my 77 limited for the oil.

I wouldn't, the culprit is most likely something in your cameras mirror box. Nikon cameras had quite a problem with oil spots in the past and most of it came from the mirror box assembly.

**mikesbike** · 01-28-2019, 04:21 AM

Originally posted by Digitalis

I wouldn't, the culprit is most likely something in your cameras mirror box. Nikon cameras had quite a problem with oil spots in the past and most of it came from the mirror box assembly.

Right. If this keeps happening, your KP being under warranty, sending it to Pentax repair service may be the thing to do. I cannot imagine any of your lenses mentioned leaking oil into your camera. But then I am not a technician.

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01-24-2019, 05:45 AM	#31
Unregistered User Guest	so, why didn't it show up with other lenses?

01-24-2019, 05:48 AM	#32
Not a Number Moderator Join Date: Mar 2012 Location: Venice, CA Posts: 10,526	Okay, so the drop(s) of oil act as a lens which interact differently depending on the focal length and f-stop. I can see that. A good look at the sensor with a the aid of a flashlight / torch probably would have revealed the drops. Definitely better left to a professional to clean. Glad all is well now.

01-24-2019, 08:47 AM	#33
blind-bat Senior Member Join Date: Feb 2009 Location: NYC Posts: 256	Originally posted by Paul the Sunman Wow, I've not heard that one before. I said it looked like a liquid drop, but I didn't consider oil! Enjoy your new clean sensor. Use of compressed air cans to clean sensor????

01-24-2019, 01:21 PM - 1 Like	#34
Paul the Sunman Pentaxian Join Date: Aug 2011 Location: Melbourne Photos: Gallery Posts: 4,843	Originally posted by blind-bat Use of compressed air cans to clean sensor???? NO, NEVER! They are full of particles. Use a rocket blower in a clean environment. ---------- Post added 25-01-19 at 07:22 AM ---------- Originally posted by dlh so, why didn't it show up with other lenses? Because he shot the other lenses at f/4.

01-24-2019, 01:30 PM	#35
blind-bat Senior Member Join Date: Feb 2009 Location: NYC Posts: 256	Originally posted by Paul the Sunman NO, NEVER! They are full of particles. Use a rocket blower in a clean environment. ---------- Post added 25-01-19 at 07:22 AM ---------- Because he shot the other lenses at f/4. Wasn't suggesting use of, merely mentioning that the OP or whoever had the lens before him may have & the force of the air would be enough to dislodge lubricant.

01-25-2019, 01:21 PM	#36
Bethor Junior Member Join Date: Apr 2018 Posts: 48 Original Poster	I bought all the lenses brand new and I never used compressed air on them. I want to blame my 77 limited for the oil. I feel that the oil really started showing after I started using that lens more often, also I use it up to f5.0 and I never noticed it until I started doing some real estate work that required me to use f9 - f11 on a different lens. However, all that aside I’m just excited that it was something simple. The place I went was really professional and very knowledgeable so I’ll be using them again. As always, everyone here rocks for insight and advice!

01-27-2019, 06:11 AM	#37
Digitalis Site Supporter Join Date: Mar 2009 Location: Melbourne, Victoria Photos: Gallery Posts: 11,694	Originally posted by Bethor I want to blame my 77 limited for the oil. I wouldn't, the culprit is most likely something in your cameras mirror box. Nikon cameras had quite a problem with oil spots in the past and most of it came from the mirror box assembly.

01-28-2019, 04:21 AM	#38
mikesbike Site Supporter Join Date: Dec 2016 Location: Southeastern Michigan Posts: 4,549	Originally posted by Digitalis I wouldn't, the culprit is most likely something in your cameras mirror box. Nikon cameras had quite a problem with oil spots in the past and most of it came from the mirror box assembly. Right. If this keeps happening, your KP being under warranty, sending it to Pentax repair service may be the thing to do. I cannot imagine any of your lenses mentioned leaking oil into your camera. But then I am not a technician.