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07-04-2016, 10:03 AM   #1
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Pentax D FA 24-70 vignetting?

Today I was taking some pictures of a local parade. When I got home and started reviewing my images in LR I noticed vignetting in my images. At first I could barley see it, then as I looked further it was more and more noticeable with each picture. Below are two images I took, both taken in full frame, all settings the same, except for the shutter speed.

Fire Truck Image: 1/2000 sec F2.8 70mm
People walking image (this was 15 pictures after the fire truck): 1/6400 sec F2.8 70mm

What am I missing? not sure why this is happening.

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07-04-2016, 10:04 AM   #2
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Do you have a filter on?
07-04-2016, 10:14 AM   #3
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QuoteOriginally posted by Venom3300 Quote
Do you have a filter on?
Just double checked, no filter on.
07-04-2016, 10:23 AM   #4
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I don't have experience of the lens, but the Tamron 24-70 f/2.8 on which I think it's based shows noticeable vignetting on FF at f/2.8.... see examples here.

07-04-2016, 10:24 AM   #5
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I seemed to have fixed it. In the menu under lens correction, I had to enable Peripheral Illumin Corr. Not sure why, this is a brand new lens developed for this camera. Kind of strange I have to enable this. Makes me wonder what other lens corrections I should enable.
07-04-2016, 10:26 AM   #6
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This is normal for this lens.

Tamron AF 24-70mm f/2.8 SP Di USD VC (FX) - Review / Test Report - Analysis (it's the same lens since this is a rebadged Tamron)

Don't shoot wide open or correct it in post for these kind of images.
07-04-2016, 10:39 AM   #7
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If you only shoot jpg then this setting should be turned on, otherwise fix it in post.

It does vignette and if you look in the viewfinder towards the sky and zoom you will see the edges of the vignette. I too find this to be somewhat bad. Also corner sharpness is not as good as one could expect from a lens this expensive. So for landscapes it may or may not be a good choise. BUT, I find it to be very sharp in most of the frame.
07-04-2016, 11:31 AM   #8
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QuoteOriginally posted by Tjompen1968 Quote
If you only shoot jpg then this setting should be turned on, otherwise fix it in post.

It does vignette and if you look in the viewfinder towards the sky and zoom you will see the edges of the vignette. I too find this to be somewhat bad. Also corner sharpness is not as good as one could expect from a lens this expensive. So for landscapes it may or may not be a good choise. BUT, I find it to be very sharp in most of the frame.
I could not agree more. I was just thrown off by my first images having no signs of vignetting and then as I took more images it became more and more noticeable. But it seems that the setting I selected fixed it. Now I am going to play with the other lens correction settings to see how the images change. Still getting used to the K1 and trying to hone in on all the base line settings that I want.

Thanks as always for your guys help.

07-04-2016, 11:50 AM   #9
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This very typical for a 24-70 f2.8 lens. The Nikon and Canon 24-70's all do it and are only around a 1/4 stop better controlled in the vignetting aspect. It is the case of best obtainable result at a price and size/weight that is acceptable to people. We owned the Nikon 24-70 G and it was actually less sharp in the corners wide open than what we have seen from the Pentax/Tamron 24-70. Ymmv, but there it is.

David
07-04-2016, 01:53 PM   #10
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Most lenses vignette. A useful resource for this is Ken Rockwell's reviews of lenses. Ken includes vignette photos in most reviews and they show clearly the amount of vignetting that various lenses have.

Regards

Chris
07-04-2016, 02:09 PM   #11
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Wide-open the 24-70mm lens has a moderate amount of vignetting. The same goes for the D FA 28-105mm.

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