Help please. What's causing this?

Crazyhorse

Crazyhorse

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Hi

I got my new Sigma 105 Macro 2.8 lens yesterday and I've been practising with it.

However, I've got this black hexagon mark in the shot, on a couple of the shots, the mark has turned pink.

Can anyone tell me what it is and how it's appeared?

Many thanks.

Lisa

flowerquery.jpg
 
thats the wierdest flare i have seen but makes sense with the aperture blades though.

is it only with this lens? and in the same place?
 
scrap the aperture theory the lens has 8 blades
 
Hi

Yes, it is only with this lens (got it yesterday), I've got a Canon 70-200 f/4 L, Canon 20-35 and the kit lens and they're all fine. My camera is a 400D.

Lisa
 
Have you tried taking a pic of a white wall or piece of paper to see if it happens again?
Looks like flare.
 
I dont know but its not good I would return the lens and show some photos or better still take the camera with you and do a couple of test shots wit this lens and another so they can clearly see its the lens....good luck
 
Hi

Thanks for the replies.

Here the black spot is showing elsewhere:

pinkfloweruseto.jpg


And here it has turned to a pink spot:

pinkdotuse.jpg


I bought the lens from Jessops and I'm going back on Friday to pick up a 40d so I'll probably put the pics on the dongle and take it in to show them.

Any further comments?

Kind regards.

Lisa
 
I think I'd ask for another lens, or (if you didn't buy it Collect at Store and get the online discount) get your money back and order another one from them (noting the serial of that one first ;))
 
Maybe its a fault in the glass, I see it isn't in the same place all the time but it could be the focus rotation, can't tell with all that croppery going on.
5 or 6 photos with the focus in different positions should see it track a perfect circle, this will prove its the lens and not software/cf cards/sensors/misc whatevers.
 
Flash In The Pan said:
I think I'd ask for another lens, or (if you didn't buy it Collect at Store and get the online discount) get your money back and order another one from them (noting the serial of that one first ;))
Click to expand...

Hi

I ordered it online and collected at store. As I say, I'll put some pics on the dongle and take it in and see what they say. I can't understand it coz I've never had a problem with my other lenses. Thanks for the tip on the serial number too.;)

Lisa x
 
joxby said:
Maybe its a fault in the glass, I see it isn't in the same place all the time but it could be the focus rotation, can't tell with all that croppery going on.
5 or 6 photos with the focus in different positions should see it track a perfect circle, this will prove its the lens and not software/cf cards/sensors/misc whatevers.
Click to expand...


Thanks I'll try the tip with the different focus positions. I cropped the pics as I thought it would be easier for people to see.

I was using lights and flash but I've used that set up before and never had a problem.

Kind regards
Lisa
 
Crazyhorse said:
HI

Thanks for the reply. What causes that and what can I do to prevent it?

Lisa
Click to expand...

The front element on the lens is quite bulbous and this can collect stray light which then reflects back into the lens from the sensor. Using a hood that shields the front element from the sun or other strong light source should help. The later 105's have a new coating to reduce what was quite a problem on the original version. As you're using flash then a hood might cast a shadow at such close working distances....a bit of a trade off.
You don't say whether you've got a filter installed but if you do then make sure that it's multi-coated as cheaper single coated ones can produce a similar aberation although normally with night shots.
Finally, a fault in one of the elements can also produce flare like symptoms.
Bob
 
Hi Bob

Thanks for the reply. I'm not using a filter.

I've brought all my equipment to work with me and at lunch time I'm going to photograph the flower again (if it hasn't died), in natural light and see what happens then.

I'll let you know. I did try using a hood the other night but as you say, it did cast a shadow.

I've never used a proper macro lens before this, so it still could be operator error on my part, is that feasible? .:bonk:

One final question, when I take some shots in natural light today and if there's no strange mark in the shot, does that mean there's not a fault with the lens. I appreciate you might not be able to answer that.

Lisa
 
It's not operator error. If it is flare then is either bad luck with the angle of a light source or a fault within the lens that causes the flare.

Bob
 
Thanks Bob.

Lisa
 
Forget lens flare, that is definately not what you have there.
Lens flare is when a bright light, ie sun, catches the lens at an angle which produces a row off light spots in a line across a picture.

Tip
If taking a picture in sunlight try to have the sun no further foreward than across the shoulder unless using a lens hood. That way you are sure to avoid flare unless it is reflected of for example water -window or the like.

Quick check, take the same photo with a different lens, if that mark isn't there with another lens then it points to the Sigma lens being faulty.

Looking at the example in the picture I would say you have a faulty lens as the mark looks very much like a projection of the lens blades onto the photo, don't even ask me how or why that is too technical for me.

Realspeed
 
Quick check, take the same photo with a different lens, if that mark isn't there with another lens then it points to the Sigma lens being faulty.
Click to expand...

That should sort it.
 
Thanks very much for the replies, I have tried my kit 18-55 and the pic was clear, no marks. I've never had any marks like those above. I know I have a spec of dust on the sensor but you can quite clearly see that's a dust mark. As I say, I'll try it again at lunch time with no flash or lights, just daylight.

I'll put the pics on here.

Thanks again.


Lisa
 
Hi

Well, I've just tried the sigma and the kit lens on the same flower.
























I'm so embarrassed, the 'fault' was actually a tiny, tiny, speck of glitter on the flower. :shake::bonk::bonk::$:$:$

Thanks ever so much to all those who offered advice.

Lisa xx
 
Hehe Lisa, at least there is nothing wrong with the lens :)

if it makes you feel better the other day while doing food colouring in water shots, i thought i had a big problem with sensor dust i cleaned it till it was spotless still had issues on the photo, cleaned both ends of the lens, still there, then i realised the dust was in the dish i was using and looked like sensor dust because it was oof. - its easy done :)
 
Toothie said:
Hehe Lisa, at least there is nothing wrong with the lens :)

if it makes you feel better the other day while doing food colouring in water shots, i thought i had a big problem with sensor dust i cleaned it till it was spotless still had issues on the photo, cleaned both ends of the lens, still there, then i realised the dust was in the dish i was using and looked like sensor dust because it was oof. - its easy done :)
Click to expand...

Ah, yes that does make me feel a LOT better, good to know other people make mistakes too. :lol::lol:

Lisa
 
realspeed said:
Forget lens flare, that is definately not what you have there.
Lens flare is when a bright light, ie sun, catches the lens at an angle which produces a row off light spots in a line across a picture.
Click to expand...


Lensflare comes in all sorts of flavours, it isn't limited to generic solar hexes.
Granted, to get the exact same thing as that twice in a row handheld is pushing it a bit, but ya never know with flash and wotnot.
Anyway, it wasn't lensflare.......where's the rollseyes smiley..:lol:
 
It's so obvious - this is a bit of glitter or something similar on the lens. :shrug:


























:exit:
 
i thought it was odd that it was on the same bi of the flower all the time...
we all live and learn and i have had similar experiences.
 
Alls well that ends well:)
 
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