Sigma 150 500 Problem


QuestionableCarrot

Link Posted 03/04/2012 - 15:30
Hi

I have had my 150 500 Sigma now for around a year and use it virtually every day - birds, macro anything when out and about.

On Sunday when I was shooting starlings the camera suddenly went into Manual Focus and displayed the following on the back of the camera F---
No F stop numnber and the Sigma refused to focus.

I turned the camera away from the bird and tried autofocusing on something else and changing a few settings - it sprung back into life.

Then just today when I was trying out my new IR remote which isnt working either I noticed the camera (k-x) had went into MF mode again despite all the settings on the Sigma 150 500 being set to auto.


THEN when I clicked into INFO i noticed the camera was on MF and I couldnt change it - when cycling through the functions it bypasses it almost like it thinks there is a MF lens on the camera.

Any ideas if its the camera or the lens?

Very worried

QC
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RayB

Link Posted 03/04/2012 - 15:40
Check the mount on the lens and see if it is a bit loose - if it is, tighten the screws that hold in place - seems to be a thing with Sigma lenses as this has come up before.

https://www.pentaxuser.com/forum/topic/sigma-170-500mm-1-5-6-3-apo-dg-zoom-31244
Last Edited by RayB on 03/04/2012 - 15:43

QuestionableCarrot

Link Posted 03/04/2012 - 15:42
K will do that cheers.
Learn how to live and you'll know how to die; learn how to die, and you'll know how to live.

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dcweather

Link Posted 03/04/2012 - 15:42
Not sure - it sounds different to my Siggy problem. Sounds like it could be problems with the contacts on the camera or the lens. I suppose you could try a factory reset of the camera?

Dave

QuestionableCarrot

Link Posted 03/04/2012 - 15:46
Hows that work mate.

DOnt want to tamper with the screws because I dont have the right (Star) screwdriver
Learn how to live and you'll know how to die; learn how to die, and you'll know how to live.

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Blythman

Link Posted 03/04/2012 - 15:52
First thing to do is clean the contacts and take the batteries out of the camera.

Leave it for 5 mins or so, put the batteries back in, and see how it works then
Alan


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Flickr

RayB

Link Posted 03/04/2012 - 15:53
Is there some play in the mount? If there is, this is almost certainly the issue.

From the sound of it Sigma might have changed to using Torx screws - you can pick up a suitable driver from Maplin or any number of on-line providers.

QuestionableCarrot

Link Posted 03/04/2012 - 15:57
Ok lots to consider there.

Cleaning the contacts? Do you mean the battery springs etc Alan?

We dont have Maplin over here mate but I will call into a DIY store and ask someone do they have something in that size.

There IS a bit of play in the mount



Thanks for alerting me to whats probably the problem
Learn how to live and you'll know how to die; learn how to die, and you'll know how to live.

Check out ones photographs on Flickr!

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Blythman

Link Posted 03/04/2012 - 16:04
Sorry Alistair. Clean the contacts between the lens and the camera. A bit of muck in there could mean threy aren't communicating properly.

As to the batteries in the Kx. Mine completely froze once. Couldn't turn it off or anything. Took batteries out, put them back in, and it never happened again. Similar thing has happened 3 times on my K5. Twice with the Siggy attached. Other time was with a Pentax lens.
Alan


PPG
Flickr

Kenty

Link Posted 03/04/2012 - 17:16
I had the same problem and was advised to clean the contacts on the lens and on the camera. I just used a clean cloth, gently rubbed the contacts(a bit of dirt came off) and have not had any similar problems since.

So do as Alan suggests before trying anything else.

Cheers....John
On a dark desert highway, cool Pentax K5 in my hand.
My Kit
K5 & 18-55 Kit lens, K7, Pentax 18-250mm lens, Sigma 10-20mm lens, Sigma 105mm Macro lens, Pentax 50mm 1.7 lens, Cokin P Series Filters
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