Question about Sigma 28-300mm f/3.5-6.3 Macro for Nikon-D AF

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Lens lock It has stopped working, when I slide the lock forward, the stop appears to engage, but with a slight twist on the lens it disengages. Any ideas.

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When I connect my AF Sigma lens to my Canon DSLR camera, the viewer reads MF while in AF mode.

What's the cause of this?

Posted on Aug 26, 2008

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My fisheye lens f stop is stuck

You didn't provide the name or model lens, so I can provide generic assistance that applies to many lenses. Hopefully, it will work for you.

Many lenses need to be set to the smallest aperture setting in order to be controlled by the camera. If it is moved off this value, the camera will be unable to change the f-stop value. If it is stuck - meaning the camera can't change it - make sure it is set for the smallest opening (highest number 28, 32, etc.). If it is stuck meaning you are unable to twist the aperture ring on the lens barrel to manually change the setting, look for a small tab that engages the aperture ring. They are often employed to prevent accidental movement of the aperture ring off of the smallest opening.

Good luck!

Feb 13, 2012 | Precision Camera Camera Lenses

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I have a slightly older version of this lens. It worked perfectly with my pentax KX the first time I attached the lens and powered on. I unattached and reattached the lens, and it no longer functions. The...

Okay did you happen to take the lens off without shutting the camera off? If so that's not a good idea. First thing I'd advise is to clean the lens contacts using a new red pencil eraser, lightly polish the gold contacts and clean the surface off with a lens cloth not a tissue. Next I'm not totally sure of the Pentax camera you have but does the camera control both the shutter speed and aperture? If so then the lens needs to be placed in the I'm going to say stopped down position before locking it to the camera, now that might be wrong so if it doesn't work then shut the camera off remove the lens and open the aperture to its wides point reinstall the lens and turn the camera on and try that. Sorry it's been a year since I used a Pentax and I'm going on memory. Another thing some older lenses although they fit the mount and appear to work may not actually work (depending on how old the 28-200 is) Some older technology in third party lenses can't keep up with the "new" cameras. In short the new camera may be able to look back in technology but the lens may not have the "chip" to look forward and the two are not compatible. I'm not saying this is the case here because you said it worked I'm thinking dirty contacts or the aperture ring was not set correctly.

Jan 20, 2011 | Tamron AF 28-200mm f/3.8-5.6 LD Aspherical...

1 Answer

I seem to be unable to change the aperture, the marker points to A on the aperture scale , is this normal the ser no is :228700 Ken

Press down the small button to the right on the green A and twist the f stop ring. This button locks the lens on A

Jul 20, 2010 | Canon 28mm f/2.8 FD Lens

1 Answer

Autofocus Failure - stopped working

Replace the broken ribbon cable in the lens

May 23, 2010 | Canon Zoom Wide Angle-Telephoto EF...

1 Answer

How do you remove the lense? Bought new lense but didn't come with instructions on how to remove the old one.

Switch off your camera before changing or removing lenses to avoid dust being attracted to the sensor
If you camera is a Canon Eos Digital Single Lens Reflex, the lens fits onto the body by being inserted into the 'hole' in the front of the body. To disengage the lens, press the button found at 4 o'clock on the body looking at it from the front and right way up. At the same time twist the lens anticlockwise and the body and lens will separate.
To mount a lens, line up either the red dots on the lens and body or the white rectangle, insert the lens into the recess and twist clockwise until you feel and hear it click home I hope this helps

Feb 24, 2010 | Canon Camera Lenses

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Sigma 28-300 Sigma lens lock

Is it the later model with a 68mm filter thread it will have a zoom lock at 28mm or the older with a 72mm
which will not have a lock let me know which one you

Feb 02, 2010 | Sigma 28-300mm f/3.5-6.3 DG Macro for...

1 Answer

Tamron 90mm 2.5 adaptall man focus lens

You probably have to set the aperture manually on the lens, because it might not have CPU contacts. I think changing the aperture on the camera will probably have no effect, so just try twisting the aperture ring to wide open.

You usually have to set the aperture at the minimum setting (highest number) so that if the camera is choosing the aperture, it can stop down to the required value.

No good having it set at f2.8 if the shot needs f11.

If the lens is very old, it might have a manual iris that you have to set yourself on the lens. The lenses that stop down automatically will have a tiny peg on the mount that a suitable camera can operate. Gentle pushing of this peg while looking through the lens will tell if it is stopping down - set it wide open first.

If you have a depth of field preview button, this will also have the same effect with the lens on the camera if the body matches up with the lens.

Jan 17, 2009 | Tamron Macro 90mm f/2.5 Manual Focus...

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What does it mean when FEE is in the view finder

FEE means that your lens is not set to the smallest aperture setting. If you are using your camera's auto-focus mode, the lens must be set to the smallest aperture setting which, on your lens, is probably f22 (the smallest aperture is the largest number). Once you set the lens aperture, you should slide the aperture lock to the locked position. The aperture lock is located just right of your largest setting f3.5. This slider should line up with the orange line. To verify that the latch is engaged, try to change the aperture by rotating the aperture ring. In the locked position, the ring will not turn.

Nov 28, 2008 | Nikon 2880AF F3.3-5.6G Zoom Nikkor,...

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Lens stops functioning

Have you tried this same lens with other cameras? Do you have another camera body you can try? or perhaps a friend with a Canon EOS Camera? Also try the following please: Remove the lens. Look at the lens mount contacts, take a Cotton swap with some rubbing Alchol & clean the contacts very well, both on the lens and the camera body. Is your camera reading the lens aperture range correctly (at least most of the time)? Also since you replaced the PCB on the lens, isn't it under warranty? Let me know if this works. Thank you, AJ.

May 23, 2007 | Canon Zoom Telephoto EF 100-400mm...

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