Question about Sigma 1770mm f284 DC Macro OS HSM Lens for Nikon Mount Digital SLR Cameras

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Pentax K20D/ Sigma 17-70 f2.8-4 OS HSM lens. Exposure problems both with on board flash and external flash [AF360 FGZ] when using PTTL.When using external flash and manually seting ISO and aperture on the flash, exposures are spot on. With a Tamron 28- 75 F2.8 lens PTTL on the external flash gives perfect exposures. Problem seems to be related to this particular sigma lens. Thanks, Dave Smith.

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Every lens has a ribbon which has circuitry that flexes as you adjust the lens

The ribbon has an open to it causing your problem

It is like the circuitry on older cars clusters which if you have ever seen that are thin and very floppy

Posted on Mar 15, 2011

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Pentax k20d


Sigma makes their lenses with a variety of mounts. If the lens has a Pentax mount then it will work with your K20d.

Aug 06, 2013 | Sigma Cameras

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I have an 18 - 200 mm sigma lens. problems are: 1. its lock does not work. the lens slides down to lower zoom magnification one raised to a diagonal position. 2. when fully extended, the thrid tube...


Send it in for repair

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1 Answer

Pentax K110d flash trigger problem, I have 2 flash trigger strobes set up and a flash on the hot shoe of the camera, but with shutter release the trigger strobe lights fire but do not show in the pic, only...


Your camera uses a PTTL flash system. That means the flash on the camera fires a "pre-flash" to set the exposure and then the main flash. Your flash trigger strobes are reacting to the pre-flash and firing before the shutter activates. This all happens in a millisecond.

Oct 25, 2010 | Pentax K110D Digital Camera

1 Answer

My 17-70 sigma lens is shaking while I'm taking videos on tripod!


Turn off the image stabilization (OS) feature of the lens. This is intended to combat camera shake when handholding the camera. It should not be used on a tripod or any other stable platform.

May 19, 2010 | Sigma 1770mm f284 DC Macro OS HSM Lens for...

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My Sigma apo 70-200mm f/2.8 hsm lens functions fine. Focus works and zooms just fine. The problem is the front part of the lens is loose. You have to hold it to secure it while shooting. Otherwise you can...


Am having the same problem. I fixed it once but can't remember how I did it. I think there are screws under the mounting ring -which has four screws itself. Then, I think under the green computer board, there are other screws that should be tightened... I will look at mine tomorrow and come back here to report.

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1 Answer

Sigma ef-530dg st pa-pttl is stuck wont auto zoom light blinks on 24 and 150 scale led


IS the flash being used on a compatible model camera? If I understand the numbers that is for a Pentax camera and is incompatible with other brands of cameras.

Double check the flash to see which cameras it is dedicated to and check to see that the flash contacts are clean on the cmaera and flash. Otherwse it will need to be sent to Sigma for repair.

Nov 04, 2009 | Sigma EF-500 DG for TTL Flash

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Focusing speed of sigma 18-200 OS HSM


As with most nikons the brighter the faster the af will work 

Jan 09, 2008 | Sigma 18-200mm f/3.5-6.3 for Nikon

1 Answer

*ids & 360 FGZ problem


I have had this problem with one of my AF360s. I think that it is the one that eventually quit, out of warranty, and cost me $80 for a new board. If once in a while is 1 out of 1,000 shots that is one thing, but if he happens almost each time that you use it you might have a dud. I would exchange it.

Sep 08, 2005 | Pentax AF-360 FGZ TTL Flash

1 Answer

Flash won't fire on p-ttl mode


The AF360 can be in TTL mode until it is mounted on a P-TTL compatible camera and turned on, then it senses the camera and goes to P-TTL. However, sometimes in the past when I got TTL and it should have been PTTL it meant that either the batteries were not connected properly (I know, sounds strange, but check the battery compartment cover to make sure it is seated properly and make sure that the batteries are all in proper position), or that the AF360's contact pins were not all making proper contact with the shoe or extension. Beyond that it could be a faulty flash. You have swapped lenses and cameras with the same result, how about swapping flash? Unfortunately that may be your problem.

Sep 08, 2005 | Pentax AF-360 FGZ TTL Flash

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