Sigma 70-200 2.8 with and without 2x TC

gatorguy · 06-08-2020, 03:25 PM

A quick pair of images, the first at 200mm and 2.8. The second taken from the same position and settings but adding a Sigma 2x TC. Note that the TC overexposes by about a stop and a half and I chose not to correct it so you can see the difference. I've been very surprised at how well the images hold with the TC.

EDIT: The images were obviously reversed. Sorry!

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**Lowell Goudge** · 06-08-2020, 03:34 PM

Note that depending on the camera body sigma lenses with TCs over expose due to the TC not correcting for the change in native aperture. This was first seriously noticed on the K10D due to the focusing screen. The same issue also applies on your camera with stopped down metering of legacy k mount lenses.

For the use of the TC you can set exposure compensation, but note flash compensation is also needed if you plan to use a flash together with the TC.

I have not noticed any serious issue on flagship bodies K7, K5 or K1 MKII with the lens plus TC but the K 10 it was really there as an issue.

There was a lot of discussion about manual lenses, and teleconverter when the K10;came out. It has abated inrecient years but not gone altogether

bertwert · 06-08-2020, 03:35 PM - **1 Like**

Originally posted by gatorguy

A quick pair of images, the first at 200mm and 2.8. The second taken from the same position and settings but adding a Sigma 2x TC. Note that the TC overexposes by about a stop and a half and I chose not to correct it so you can see the difference. I've been very surprised at how well the images hold with the TC.

EDIT: The images were obviously reversed. Sorry!

Obviously not the same settings, as the TC shot is at 1/125s and the other at 1/1500s. Looks like Av mode was used, and it makes sense that the TC shot is a much slower exposure, as it loses two stops of light.

The reason the TC shot seems brighter, is most likely that the dark coloured chair takes up more of the frame, hence the metering system deciding that a brighter exposure is necessary for the scene.

gatorguy · 06-08-2020, 04:07 PM

Originally posted by bertwert

Obviously not the same settings, as the TC shot is at 1/125s and the other at 1/1500s. Looks like Av mode was used, and it makes sense that the TC shot is a much slower exposure, as it loses two stops of light.

The reason the TC shot seems brighter, is most likely that the dark coloured chair takes up more of the frame, hence the metering system deciding that a brighter exposure is necessary for the scene.

OOPS! Let me redo that one at the same settings.

For what it;s worth the TC always overexposes, and I've been setting exposure compensation at -1.5 which seems to level it out. For this test I did not, once again just to demo the difference, I'll add some shots tomorrow.

gatorguy · 06-08-2020, 04:26 PM

Let's try again Bertwert...
Sigma @200 2.8 with and without Sigma 2x teleconverter.

**Lowell Goudge** · 06-08-2020, 05:30 PM - **1 Like**

Change metering to spot. That will make exposure more consistent.

gatorguy · 06-08-2020, 05:41 PM

Originally posted by Lowell Goudge

Change metering to spot. That will make exposure more consistent.

Thanks Lowell.

**termy** · 06-09-2020, 05:13 AM

chotto.
which version of the Sigma 70-200 is this?

the DG OS HSM? the EX DG?

gatorguy · 06-09-2020, 05:32 AM

Originally posted by termy

chotto.
which version of the Sigma 70-200 is this?

the DG OS HSM? the EX DG?

EX DG.

I've read complaints about paint chipping, it's a nice looking very dark grey matte, but this one shows zero signs of it. The 2x TC has the identical finish and color. a perfect match, and I don't believe the HSM version is compatible with this TC anyway. In fact there are few lenses that will be usable with this TC. Lowell is more familiar with these and could answer with more authority.

I'm exceptionally pleased with how well this combo works as I expected much more in the way of image degradation and auto-focusing issues than I'm seeing. I've never used a 2x before that was worth even bothering with until this.

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06-08-2020, 03:34 PM	#2
Lowell Goudge Site Supporter Join Date: Jan 2007 Location: Toronto Photos: Gallery \| Albums Posts: 17,891	Note that depending on the camera body sigma lenses with TCs over expose due to the TC not correcting for the change in native aperture. This was first seriously noticed on the K10D due to the focusing screen. The same issue also applies on your camera with stopped down metering of legacy k mount lenses. For the use of the TC you can set exposure compensation, but note flash compensation is also needed if you plan to use a flash together with the TC. I have not noticed any serious issue on flagship bodies K7, K5 or K1 MKII with the lens plus TC but the K 10 it was really there as an issue. There was a lot of discussion about manual lenses, and teleconverter when the K10;came out. It has abated inrecient years but not gone altogether

06-08-2020, 03:35 PM - 1 Like	#3
bertwert Veteran Member Join Date: Jun 2015 Location: Golden, BC Posts: 15,172	Originally posted by gatorguy A quick pair of images, the first at 200mm and 2.8. The second taken from the same position and settings but adding a Sigma 2x TC. Note that the TC overexposes by about a stop and a half and I chose not to correct it so you can see the difference. I've been very surprised at how well the images hold with the TC. EDIT: The images were obviously reversed. Sorry! Obviously not the same settings, as the TC shot is at 1/125s and the other at 1/1500s. Looks like Av mode was used, and it makes sense that the TC shot is a much slower exposure, as it loses two stops of light. The reason the TC shot seems brighter, is most likely that the dark coloured chair takes up more of the frame, hence the metering system deciding that a brighter exposure is necessary for the scene.

06-08-2020, 04:07 PM	#4
gatorguy Moderator Join Date: Feb 2015 Location: Central Florida Photos: Gallery Posts: 6,094 Original Poster	Originally posted by bertwert Obviously not the same settings, as the TC shot is at 1/125s and the other at 1/1500s. Looks like Av mode was used, and it makes sense that the TC shot is a much slower exposure, as it loses two stops of light. The reason the TC shot seems brighter, is most likely that the dark coloured chair takes up more of the frame, hence the metering system deciding that a brighter exposure is necessary for the scene. OOPS! Let me redo that one at the same settings. For what it;s worth the TC always overexposes, and I've been setting exposure compensation at -1.5 which seems to level it out. For this test I did not, once again just to demo the difference, I'll add some shots tomorrow.

06-08-2020, 05:30 PM - 1 Like	#6
Lowell Goudge Site Supporter Join Date: Jan 2007 Location: Toronto Photos: Gallery \| Albums Posts: 17,891	Change metering to spot. That will make exposure more consistent.

06-08-2020, 05:41 PM	#7
gatorguy Moderator Join Date: Feb 2015 Location: Central Florida Photos: Gallery Posts: 6,094 Original Poster	Originally posted by Lowell Goudge Change metering to spot. That will make exposure more consistent. Thanks Lowell.

06-09-2020, 05:13 AM	#8
termy Loyal Site Supporter Join Date: Jan 2019 Posts: 1,155	chotto. which version of the Sigma 70-200 is this? the DG OS HSM? the EX DG?

06-09-2020, 05:32 AM	#9
gatorguy Moderator Join Date: Feb 2015 Location: Central Florida Photos: Gallery Posts: 6,094 Original Poster	Originally posted by termy chotto. which version of the Sigma 70-200 is this? the DG OS HSM? the EX DG? EX DG. I've read complaints about paint chipping, it's a nice looking very dark grey matte, but this one shows zero signs of it. The 2x TC has the identical finish and color. a perfect match, and I don't believe the HSM version is compatible with this TC anyway. In fact there are few lenses that will be usable with this TC. Lowell is more familiar with these and could answer with more authority. I'm exceptionally pleased with how well this combo works as I expected much more in the way of image degradation and auto-focusing issues than I'm seeing. I've never used a 2x before that was worth even bothering with until this.