shadow around the picture

nutz · 10-10-2019, 12:32 PM

New here so I will keep it short; I have a Pentax istDs camera with the 18-55MM lens. Awhile back the pictures have all had what looks like a shadow around the corners of the pictures, I am sure it's from the lens as I have cleaned and it still is doing it. I tried a different lens and it didn't do it with it. As you can see in the pics I added it is pretty bad but funny thing is it doesn't do it on every shot.
Can anyone tell me what's going on with this lens?
Thanks

Attached Images

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**MossyRocks** · 10-10-2019, 12:40 PM

It is vignetting. probably from a hood that is not right for the lens since it is appearing at the wide end.

timb64 · 10-10-2019, 12:57 PM

Looks like you’ve also got a couple of dust spots on your sensor,so you might want to clean that.

photoptimist · 10-10-2019, 12:57 PM

Originally posted by MossyRocks

It is vignetting. probably from a hood that is not right for the lens since it is appearing at the wide end.

^^^^^THIS^^^^

It could also be from adding a thick filter (e.g., polarizer) or a stack of filters

**MossyRocks** · 10-10-2019, 12:59 PM

Originally posted by timb64

Looks like you’ve also got a couple of dust spots on your sensor,so you might want to clean that.

I noticed those too but only after the original post.

**pepperberry farm** · 10-10-2019, 01:01 PM

first one is at 18mm, second shot at 55mm - definitely a non-OEM hood or filter causing the vignette...

**Apet-Sure** · 10-10-2019, 01:08 PM

When I got my Sigma 17-70mm lens I bought a rubbery hood that would collapse in three stages. It's fully extended when the lens is at the 70mm end, partially collapsed around 35mm, and collapsed to its last setting at 17mm. You just have to keep the hood out of the field of view.

**Alex645** · 10-10-2019, 01:18 PM - **1 Like**

Originally posted by nutz

New here so I will keep it short; I have a Pentax istDs camera with the 18-55MM lens.
Can anyone tell me what's going on with this lens?

The ideal lens hood (albeit price) is the Pentax tulip shaped lens hood:
Pentax PH-RBC 52mm Lens Hood 38766 B&H Photo Video
This hood is faster to attach than a screw-in type and has a small door which helps when using a circular polarizer.

Notice how the corners on the hood are very shallow so that the hood won't cause vignetting when you zoom out at 18mm?

For much less $$, you can get a Sensei tulip shaped hood that screws in, but you have to be careful to orient the hood so that the larger 'petals' are on the top and bottom only.
https://www.bhphotovideo.com/c/product/843330-REG/sensei_lhsc_52_52mm_screw_on_tulip_lens.html

The only other times I've seen dark corners like this was when using an inexpensive screw-on wide angle adapter lens.

stevebrot · 10-10-2019, 01:43 PM

Originally posted by Alex645

The only other times I've seen dark corners like this was when using an inexpensive screw-on wide angle adapter lens.

...or a stack of filters on same.

Steve

**Alex645** · 10-10-2019, 01:53 PM

Originally posted by stevebrot

...or a stack of filters on same.
Steve

LOL. Yes, the ultimate stack of a UV, skylight, haze, neutral density, AND polarizer, each with their own step up and down rings because each filter is a different diameter, of which are all smaller than the lens diameter.

On the other hand, it could be the empty Pringles can that was a bit too long for the lens used.

stevebrot · 10-10-2019, 01:54 PM - **1 Like**

Originally posted by Alex645

On the other hand, it could be the empty Pringles can that was a bit too long for the lens used.

In my case, the other hand usually looks like...ummmm...my hand...

Steve

kypfer · 10-10-2019, 02:41 PM

Originally posted by nutz

New here so I will keep it short; I have a Pentax istDs camera with the 18-55MM lens. Awhile back the pictures have all had what looks like a shadow around the corners of the pictures, I am sure it's from the lens as I have cleaned and it still is doing it. I tried a different lens and it didn't do it with it. As you can see in the pics I added it is pretty bad but funny thing is it doesn't do it on every shot.
Can anyone tell me what's going on with this lens?
Thanks

Just by chance, do you happen to also own the 50-200mm lens and have managed to swap the lens hoods?

The fitting is the same and they will mechanically interchange!

For reference, the 50-200mm hood is "PH-RBB 52mm", the hood for the 18-55mm is "PH-RBA 52mm". These are the numbers on the hoods on my lenses, I'd guess the "PH-RBC" quoted above is possibly a later version, what differences there are, if any, I don't know, but brief research suggests the "PH-RBC" is for the "WR" lens and is not interchangeable with the earlier version!

stevebrot · 10-10-2019, 03:55 PM

Originally posted by kypfer

The fitting is the same and they will mechanically interchange!

The shape will be wrong, however.

Steve

08amczb · 10-11-2019, 12:30 AM - **1 Like**

Remove the hood and all the filters and then try adding them one by one. Shoot at the widest focal length (18mm). You will see what adds the vignetting.

**othar** · 10-11-2019, 03:20 AM

Originally posted by 08amczb

Remove the hood and all the filters and then try adding them one by one. Shoot at the widest focal length (18mm). You will see what adds the vignetting.

+1

Originally posted by kypfer

Just by chance, do you happen to also own the 50-200mm lens and have managed to swap the lens hoods?

I didn't know that, but this is definitely something to check if you own both.

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10-10-2019, 12:40 PM	#2
MossyRocks Loyal Site Supporter Join Date: Nov 2017 Location: Minnesota Photos: Gallery \| Albums Posts: 2,982	It is vignetting. probably from a hood that is not right for the lens since it is appearing at the wide end.

10-10-2019, 12:57 PM	#3
timb64 Pentaxian Join Date: Apr 2012 Location: /Situation : Doing my best to avoid idiots! Photos: Gallery Posts: 9,510	Looks like you’ve also got a couple of dust spots on your sensor,so you might want to clean that.

10-10-2019, 12:57 PM	#4
photoptimist Pentaxian Join Date: Jul 2016 Photos: Albums Posts: 5,123	Originally posted by MossyRocks It is vignetting. probably from a hood that is not right for the lens since it is appearing at the wide end. ^^^^^THIS^^^^ It could also be from adding a thick filter (e.g., polarizer) or a stack of filters

10-10-2019, 12:59 PM	#5
MossyRocks Loyal Site Supporter Join Date: Nov 2017 Location: Minnesota Photos: Gallery \| Albums Posts: 2,982	Originally posted by timb64 Looks like you’ve also got a couple of dust spots on your sensor,so you might want to clean that. I noticed those too but only after the original post.

10-10-2019, 01:01 PM	#6
pepperberry farm amateur dirt farmer Join Date: Dec 2014 Location: probably out in a field somewhere... Photos: Gallery \| Albums Posts: 41,678	first one is at 18mm, second shot at 55mm - definitely a non-OEM hood or filter causing the vignette...

10-10-2019, 01:08 PM	#7
Apet-Sure Site Supporter Join Date: Dec 2015 Location: Goldsboro North Carolina Photos: Gallery \| Albums Posts: 2,861	When I got my Sigma 17-70mm lens I bought a rubbery hood that would collapse in three stages. It's fully extended when the lens is at the 70mm end, partially collapsed around 35mm, and collapsed to its last setting at 17mm. You just have to keep the hood out of the field of view.

10-10-2019, 01:18 PM - 1 Like	#8
Alex645 Site Supporter Join Date: May 2015 Location: Kaneohe, HI Photos: Albums Posts: 3,526	Originally posted by nutz New here so I will keep it short; I have a Pentax istDs camera with the 18-55MM lens. Can anyone tell me what's going on with this lens? The ideal lens hood (albeit price) is the Pentax tulip shaped lens hood: Pentax PH-RBC 52mm Lens Hood 38766 B&H Photo Video This hood is faster to attach than a screw-in type and has a small door which helps when using a circular polarizer. Notice how the corners on the hood are very shallow so that the hood won't cause vignetting when you zoom out at 18mm? For much less $$, you can get a Sensei tulip shaped hood that screws in, but you have to be careful to orient the hood so that the larger 'petals' are on the top and bottom only. https://www.bhphotovideo.com/c/product/843330-REG/sensei_lhsc_52_52mm_screw_on_tulip_lens.html The only other times I've seen dark corners like this was when using an inexpensive screw-on wide angle adapter lens.

10-10-2019, 01:43 PM	#9
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	Originally posted by Alex645 The only other times I've seen dark corners like this was when using an inexpensive screw-on wide angle adapter lens. ...or a stack of filters on same. Steve

10-10-2019, 01:53 PM	#10
Alex645 Site Supporter Join Date: May 2015 Location: Kaneohe, HI Photos: Albums Posts: 3,526	Originally posted by stevebrot ...or a stack of filters on same. Steve LOL. Yes, the ultimate stack of a UV, skylight, haze, neutral density, AND polarizer, each with their own step up and down rings because each filter is a different diameter, of which are all smaller than the lens diameter. On the other hand, it could be the empty Pringles can that was a bit too long for the lens used.

10-10-2019, 01:54 PM - 1 Like	#11
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	Originally posted by Alex645 On the other hand, it could be the empty Pringles can that was a bit too long for the lens used. In my case, the other hand usually looks like...ummmm...my hand... Steve

10-10-2019, 02:41 PM	#12
kypfer Pentaxian Join Date: Jan 2018 Location: Jersey C.I. Posts: 3,593	Originally posted by nutz New here so I will keep it short; I have a Pentax istDs camera with the 18-55MM lens. Awhile back the pictures have all had what looks like a shadow around the corners of the pictures, I am sure it's from the lens as I have cleaned and it still is doing it. I tried a different lens and it didn't do it with it. As you can see in the pics I added it is pretty bad but funny thing is it doesn't do it on every shot. Can anyone tell me what's going on with this lens? Thanks Just by chance, do you happen to also own the 50-200mm lens and have managed to swap the lens hoods? The fitting is the same and they will mechanically interchange! For reference, the 50-200mm hood is "PH-RBB 52mm", the hood for the 18-55mm is "PH-RBA 52mm". These are the numbers on the hoods on my lenses, I'd guess the "PH-RBC" quoted above is possibly a later version, what differences there are, if any, I don't know, but brief research suggests the "PH-RBC" is for the "WR" lens and is not interchangeable with the earlier version!

10-10-2019, 03:55 PM	#13
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	Originally posted by kypfer The fitting is the same and they will mechanically interchange! The shape will be wrong, however. Steve

10-11-2019, 12:30 AM - 1 Like	#14
08amczb Veteran Member Join Date: Dec 2013 Posts: 796	Remove the hood and all the filters and then try adding them one by one. Shoot at the widest focal length (18mm). You will see what adds the vignetting.

10-11-2019, 03:20 AM	#15
othar Site Supporter Join Date: May 2014 Location: Linz Photos: Albums Posts: 3,098	Originally posted by 08amczb Remove the hood and all the filters and then try adding them one by one. Shoot at the widest focal length (18mm). You will see what adds the vignetting. +1 Originally posted by kypfer Just by chance, do you happen to also own the 50-200mm lens and have managed to swap the lens hoods? I didn't know that, but this is definitely something to check if you own both.