Sigma 10-20mm bad vignetting?

Oriel

Folks,
Again I'm thinking about getting this lens at the end of the month. My only worry about it is the vignetting that I've seen in some online samples:

Like:


And:


I'm not sure if it's just with the D70 or what?
Fajitas, does this happen with your lens at all?

I haven't really had a problem with vignetting at all in until now, so any info would be appreciated.

Cheers,
S.

rymus

I've got the same lens and never had a problem...

heres a few I've taken with it;
http://flickr.com/photos/rymus/162648350/
http://flickr.com/photos/rymus/162648417/
http://flickr.com/photos/rymus/162648100/
http://flickr.com/photos/rymus/162647905/
http://flickr.com/photos/rymus/162647636/


I shan't go on, I'm sure you get the idea...

Oriel

Rymus, you have a Canon though, yeah?

440Hz

Sorry cant comment on the lens, but some of those shots are really great rymus!! Well done.

311

I just bought a 10-20 for my 350D ,very well balanced compared to other lenses.
I get vignetting with standard lenses sometimes ,depends on the light.

rymus

sinecurea wrote:

Rymus, you have a Canon though, yeah?

Yop, a 20D. Apologies if I read it wrong, I thought you had a Canon but wanted to be shown that the problem only occurs with the D70.

Oriel

rymus wrote:

I thought you had a Canon

:eek:

Never!
I think I'll probably end up going for this lens ok unless I hear any horror stories...

Dimy

sinecurea wrote:

:eek:

Never!
I think I'll probably end up going for this lens ok unless I hear any horror stories...

Don't ask Fajitas! He luvs vignetting, if it's not in the pic, he'll photoshop it in!

Fenster

What kind of price tag is on the 10-20mm?

Oriel

About £320

Fajitas!

Lovely lens! There's only vignetting when I put it on full frame cameras but your D70 shouldn't show much of it. Well unless you're using a lot of filters.

Anyhow... This is on a 1.6 cropped DSLR...

And this is on a full frame SLR...

311

sinecurea wrote:

About £320

I paid ,mind you got a 77MM UV filter aswell ,500 squidaroos.
Just today I bought it ,get a filter with it ,theres not much glass sticking out so I would say a mark would show up like a hair on your sensor.

Oriel

Yeah, that sounds about right. Sure fire up a few samples when you get them shot

311

sinecurea wrote:

Yeah, that sounds about right. Sure fire up a few samples when you get them shot

I'll take you up on that.
I bought it in town by the way ,thats a street price.

I personally think people are mad buying sigma outside ireland ,i had the lense in my hand before i handed over the dosh.

All lenses have a chance of being soft or dodgy .

My deal works out the same on AC-FoTo

JMcL

There seems to be, or at least have been, serious quality control issues with this particular lens. A significant number of people in the Fred Miranda review have reported a problem where the entire right side of the frame is soft or in worse cases completely out of focus.

A super wide is near the top of my shopping list at the moment, and I'm probably between this, as good copies seem to be excellent, and one of the Tamrons (the Canon 10-22 is just a wee bit pricey). With the QC issues, I'd probably buy locally in this instannce, unless there was a startling difference in price

John

311

The shop i bought my lens in will hire you a lens and if you like it you can take the hire price off a new lens.

At least that way you'll have a comparison.

I'm off now to take some shots ,will post them when i get back.

P.S. I've read a misaligned sensor on a 350d etc,can cause softness in images from wideangle/fisheyes.

donncha

I bought the Sigma 10-20 2 weeks ago and I've been very happy with it. I also use a Canon 20D but I doubt the choice of camera would affect vignetting.
From what I've read you need to shoot at around f/8 to limit vignetting but I haven't noticed any bad problems and I'm very happy with it.
Vignetting isn't always bad either!

Oriel

donncha, from that link you gave me, I had to have a chuckle at this:

Oriel

Also, with the D70, does that mean I'm only ever going to get 16mm-32mm out of this lens?

donncha

Unfortunately there is the multiplier effect so yes, you won't get the real 10mm wide angle.
You could shell out for a 8mm fish eye or buy a Canon 5D and shell out even more for full frame lenses!

Oriel

donncha wrote:

buy a Canon 5D

NEVER! All stand now!

311

I took this shot in a shop that was fairly dark
The right side of the lens is at the top, doesn't seem to be much vignetting at all.
The right side of the image had no lighting ,it was dark.


First day with the lens and it's dark :mad:

JMcL

The Nikon cropping factor is 1.5x so it'll be 15-30mm equivalent which isn't too shabby.

John

JMcL

_Brian_ wrote:

The shop i bought my lens in will hire you a lens and if you like it you can take the hire price off a new lens.

What shop did you buy in Brian? That sounds like a good idea.

John

311

Bought it in Conns ,I've bought everything in there .
People give out about there prices ,but I've bought bags in there at web prices and there sigma stuff is the same as the web.

dalk

sinecurea wrote:

Also, with the D70, does that mean I'm only ever going to get 16mm-32mm out of this lens?

JMcL wrote:

The Nikon cropping factor is 1.5x so it'll be 15-30mm equivalent which isn't too shabby.

The 10-20mm zoom is a DC lens, so is specifically designed for APC-C sized sensor cameras like the D70 and 350D etc. so there is no cropping factor when used with these cameras.

The cropping factor only applies when using lens originally designed for 35mm film or equivalent digital cameras. Fajitas' shot clearly demonstrates what happens when you put the DC lens on a 35mm camera (its not designed to be used on)... severe vignetting.

Alun

dalk wrote:

The 10-20mm zoom is a DC lens, so is specifically designed for APC-C sized sensor cameras like the D70 and 350D etc. so there is no cropping factor when used with these cameras.

The cropping factor only applies when using lens originally designed for 35mm film or equivalent digital cameras. Fajitas' shot clearly demonstrates what happens when you put the DC lens on a 35mm camera (its not designed to be used on)... severe vignetting.

But ... I'd always assumed that even though it's a DC lens that the quoted focal lengths were "35mm equivalent" ones.

In fact from the review on dpreview.com ...

The second of three DC (digital SLR only) lenses announced by Sigma today is the 10 - 20 mm F4.0 - F5.6 EX DC HSM, an interesting super wide-angle lens which would provide 15 - 30 mm equiv. on a 1.5 FOV crop camera (such as the Nikon D70). This lens also features Sigma's HSM (HyperSonic Motor) for high speed silent focusing with manual focus override.

andy1249

Sorry Dalk but thats incorrect information I'm afraid , cropping factor still applies , all focal lengths quoted on all lenses apply to 35mm equivalent , regardless of sensor size or model intended.

actual focal lengths acheived on both the canon 350D and the Nikon D70 will be multiplied by 1.6 and 1.5 respectively over the 35mm equivalent quoted.

Its in the manual lads , for both models !!

311

I used to think the same thing aswell ,but don't forget the sensor is small so everything else is smaller too.

it works out at 17-34 in 35mm ,if the same view was to be had.

If you put the DC lens on a 35mm camera ,it would make the lens a 6-14 or something.

its headmelting.

Fajitas!

sinecurea wrote:

NEVER! All stand now!

Argh me eyes!

It's so bright...It's so...Ugh!

andy1249

No Brian , your overcompensating and going totally the other way now , there is no division factor for 35mm , the ranges quoted are for 35mm so on a 35mm thats exactly what you get !!

An APS-C size sensor is smaller than a 35mm frame on a canon , to be the same size as a 35mm frame you have to multiply by 1.6 see !! Thats where the "Crop" factor comes in , in essence , the smaller sensor is the equivalent of cropping a 35mm frame , or increasing the zoom !!

So on a 35mm it stays the same.

Hope this clears it up.

dalk

Sorry for that lads....:eek:

I just assumed (my mistake) that seeing as it was a DC lens that they would clear up all the cropping confusion... Obviously not and i stand corrected.

311

andy1249 wrote:

No Brian , your overcompensating and going totally the other way now , there is no division factor for 35mm , the ranges quoted are for 35mm so on a 35mm thats exactly what you get !!

An APS-C size sensor is smaller than a 35mm frame on a canon , to be the same size as a 35mm frame you have to multiply by 1.6 see !! Thats where the "Crop" factor comes in , in essence , the smaller sensor is the equivalent of cropping a 35mm frame , or increasing the zoom !!

So on a 35mm it stays the same.

Hope this clears it up.

I'm actually right in what i said ,i probably misplaced a few words.
In the manual for the lens it says it would be a 17-34 if it was on a 35mm camera . I.E The view of a lense 17-40 on a 35mm camera ,is near the same as the 10-20mm DC on a small sized sensor camera.

I'm talking field of view hear ,field of view is the same.

Brian

andy1249

Maybe im misreading this Brian , but in your post above you said that if you put a 10-20 mm Sigma on a 35mm you would get 6- 14 mm !!
Am I right ?

If so , this is not correct , that 10-20mm sigma on a 35mm would give 10 -20 mm.
The manual states that if you put it on a Nikon D70 or a Canon 350 , ( any aps-c camera ) then you get 17 - 34 , ( effective zoom increase ! )

The range increases when placed on an APS-C camera , on any 35mm it stays the same , it never reduces.

However this lens , and the other Digital or APS-C intended lenses , will not produce a picture big enough to fill a 35mm frame , someone above has posted what you get of you manage to mount to a 35mm camera , the image is circular with a black frame , the range however , is still 10 -20 mm.
http://www.tipa.com/awa_detail_2006.lasso?-Search=Action&-Table=web&-Database=awards_2006&-KeyValue=83

Its easy to test if you use both film and Digital SLRs , use the kit lens for the digital , and any other lens for the 35mm that crosses the range of the digital, mount both on tripods , and using the guage set both to , say 40mm and have a look at he frame through the camera.
Although both are set to 40mm the digital is closer to the subject ( apparently ! ) , now zoom the 35mm until you see the same as you so in the digital , you will end up at approx 1.6 the value of the 35mm when the view through the camera is the same. ( I have a canon by the way , its 1.5 for the Nikon. )

There is an effective zoom on the APS-C , the frame is bigger on the film or 35mm and never reduces , it always does what it says on the guage !!

digitalbeginner

Don't forget that a lens hood could also be causing the vignetting.

311

I no longer wish to argue about crops ,croppings or any other sort of cropper.


I have a manual SLR camera alright and 4 lenses for it.
and two small frame lenses.

I use to argue about it like yourself,but a few people put me straight about it.

The picture is the end result ,regardless of whose holding the calculator.

rymus

calculators can take photos now? Jimminy Cricket, I gotta start reading more of these kind of threads

andy1249

Apologies if any of the above offended ,

Forums like this are very useful only insofar as the information that is posted is factual, with this lens at 600euro plus I think people would like to know what they are getting , especially if you are trying to cover a range on a least or limited budget.

I didnt see any of this as an argument , merely correcting the information.
I totally agree that the picture is the main thing , by the way , and really hard to do without the correct lens

rabbitinlights

andy1249 wrote:

with this lens at 600euro plus

Kea Photo (ebay)

Its €395 Delivered with international Warranty.

S.