SIGMA 10-20mm CLUB

philbaum · 01-10-2010, 12:58 AM

Originally posted by Fl_Gulfer

I just took this with my new Sigma 10-20 and I don't think it's very clear.

Click to Enlarge.

Gulfer,
I don't know about clear, but i didn't think the image was in focus. It looked like it was close too focus up close, but those 2 figures down the beach were fuzzy, i thought.

I don't know what focal length you were at, but at low light conditions, my 10-20 has problems focusing near 10mm. and i've read that complaint from a few other users as well. I always use manual focus under those conditions to achieve hyper focus. i think if you dial in 3 or 6 feet you're there. as focal length increases beyond 12 mm, my lens usually again picks up the focus. I was wondering if perhaps that was the problem with this image.

axl · 01-10-2010, 01:40 AM

As Phil said,
it seems that the forground is in the focus but not the rest of the image. I'd blame the AF not the lens.

axl · 01-10-2010, 01:44 AM

Icy dawn

jgredline · 01-10-2010, 10:38 AM

Gulfer, When especially at 10mm, try shooting the lens at F/8 and simply hyperfocal. Atleast I have found this to be the best starting point for me.

panoguy · 01-10-2010, 11:17 AM

Originally posted by jibbonpoint

Great shots. I do have this lens; purchased about six months ago. Has anyone had success indoors with flash? I've the F360z & I can't seem to do any good at all. I've deleted the few attempts I've made.

Can't help you specifically with the 10-20 and flash (but thanks to this thread it is on my wishlist and short-listed!), but for any wide-angle flash work, you really need to use a "dome-type" diffuser. Yes, it limits the distance and power of your flash, but point the thing up with a plastic blob on it and it will light up your wide angle field of view.

Most motorized flashes (like the 360) only go to about 24mm FOV, and their little "plop-up" diffuser panels do jack. Get an Omnibounce or a cheap knock-off of a Gary Fong (google them), or make one out of translucent white tupperware. Looks silly, but does the trick!

To keep more of your flash power going forward (the above plastic diffusers scatter the light 360 degrees), you could also go "turbo-silly" and build one of these: DIY Reflector-Diffuser

Here is a pic of Gooshin (from this very forum) trying my DIY wide-angle bounce diffuser out:
(Not taken with a Sigma 10-20mm!)

**ramiot** · 01-10-2010, 12:18 PM - **1 Like**

1 A College near by

By ramiot, shot with PENTAX K20D at 2009-07-07

2 Old house

By ramiot, shot with PENTAX K20D at 2009-06-22

3 Field in automn

By ramiot at 2009-10-14

Jewelltrail · 01-11-2010, 11:13 AM

Here we are at 13mm I believe:

philbaum · 01-11-2010, 11:55 AM

Originally posted by Jewelltrail

Here we are at 13mm I believe:

Wow, thats an amazing image - congrats. Thats like a brick wall, but huge. And the range of sharpness from top to bottom to each corner is incredible.

Jewelltrail · 01-12-2010, 10:42 AM

Quote:

philbaum: Wow, thats an amazing image - congrats. Thats like a brick wall, but huge. And the range of sharpness from top to bottom to each corner is incredible.

Thanks Phil--the lens is pure delight--no doubt.

jgredline · 01-14-2010, 10:51 PM

Time to wake this thread up with a cheesy snap shot

Jewelltrail · 01-17-2010, 12:38 PM

And here we are @ 15mm:

axl · 01-17-2010, 02:19 PM

I took my 10-20 for a spin on Saturday.
Ended up at London's Picadilly and since it was rainy outside, I took a refuge in one of the shopping arcades along the street. Had few good results. Here is one:

cb750r · 01-17-2010, 10:18 PM

Granville Island in Vancouver BC

jgredline · 01-17-2010, 10:53 PM

Originally posted by cb750r

Granville Island in Vancouver BC

Very Nice.

digitalCG · 01-18-2010, 04:20 PM

Some really nice images coming out on this thread, keep it up folks!

Two more recent ones, both with ND110 filter attached:

01-10-2010, 01:44 AM	#168
axl Inactive Account Join Date: Mar 2007 Location: Nove Zamky, Slovakia Photos: Gallery \| Albums Posts: 7,181	...and one to keep things going Icy dawn

01-10-2010, 11:17 AM	#170
panoguy Pentaxian Join Date: Sep 2007 Location: Washington, D.C. Photos: Gallery \| Albums Posts: 3,294	Wide-angle flash? Diffuse it! Originally posted by jibbonpoint Great shots. I do have this lens; purchased about six months ago. Has anyone had success indoors with flash? I've the F360z & I can't seem to do any good at all. I've deleted the few attempts I've made. Can't help you specifically with the 10-20 and flash (but thanks to this thread it is on my wishlist and short-listed!), but for any wide-angle flash work, you really need to use a "dome-type" diffuser. Yes, it limits the distance and power of your flash, but point the thing up with a plastic blob on it and it will light up your wide angle field of view. Most motorized flashes (like the 360) only go to about 24mm FOV, and their little "plop-up" diffuser panels do jack. Get an Omnibounce or a cheap knock-off of a Gary Fong (google them), or make one out of translucent white tupperware. Looks silly, but does the trick! To keep more of your flash power going forward (the above plastic diffusers scatter the light 360 degrees), you could also go "turbo-silly" and build one of these: DIY Reflector-Diffuser Here is a pic of Gooshin (from this very forum) trying my DIY wide-angle bounce diffuser out: (Not taken with a Sigma 10-20mm!)

01-10-2010, 12:18 PM - 1 Like	#171
ramiot Site Supporter Join Date: Feb 2007 Location: Prevost, Quebec, Canada Photos: Gallery Posts: 407	10-20mm at work in Quebec. 1 A College near by By ramiot, shot with PENTAX K20D at 2009-07-07 2 Old house By ramiot, shot with PENTAX K20D at 2009-06-22 3 Field in automn By ramiot at 2009-10-14

01-17-2010, 02:19 PM	#177
axl Inactive Account Join Date: Mar 2007 Location: Nove Zamky, Slovakia Photos: Gallery \| Albums Posts: 7,181	Shopping arcade in Picadilly I took my 10-20 for a spin on Saturday. Ended up at London's Picadilly and since it was rainy outside, I took a refuge in one of the shopping arcades along the street. Had few good results. Here is one:

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01-10-2010, 12:58 AM	#166
philbaum Veteran Member Join Date: Oct 2007 Location: Port Townsend, Washington State, USA Posts: 3,659	Originally posted by Fl_Gulfer I just took this with my new Sigma 10-20 and I don't think it's very clear. Click to Enlarge. Gulfer, I don't know about clear, but i didn't think the image was in focus. It looked like it was close too focus up close, but those 2 figures down the beach were fuzzy, i thought. I don't know what focal length you were at, but at low light conditions, my 10-20 has problems focusing near 10mm. and i've read that complaint from a few other users as well. I always use manual focus under those conditions to achieve hyper focus. i think if you dial in 3 or 6 feet you're there. as focal length increases beyond 12 mm, my lens usually again picks up the focus. I was wondering if perhaps that was the problem with this image.

01-10-2010, 01:40 AM	#167
axl Inactive Account Join Date: Mar 2007 Location: Nove Zamky, Slovakia Photos: Gallery \| Albums Posts: 7,181	As Phil said, it seems that the forground is in the focus but not the rest of the image. I'd blame the AF not the lens.

01-10-2010, 10:38 AM	#169
jgredline Pentaxian Join Date: Oct 2007 Location: LosAngeles, Ca. Photos: Albums Posts: 10,627	Gulfer, When especially at 10mm, try shooting the lens at F/8 and simply hyperfocal. Atleast I have found this to be the best starting point for me.

01-11-2010, 11:55 AM	#173
philbaum Veteran Member Join Date: Oct 2007 Location: Port Townsend, Washington State, USA Posts: 3,659	Originally posted by Jewelltrail Here we are at 13mm I believe: Wow, thats an amazing image - congrats. Thats like a brick wall, but huge. And the range of sharpness from top to bottom to each corner is incredible.

01-12-2010, 10:42 AM	#174
Jewelltrail Veteran Member Join Date: May 2008 Location: Rhode Island Photos: Albums Posts: 4,180 Original Poster	Quote: philbaum: Wow, thats an amazing image - congrats. Thats like a brick wall, but huge. And the range of sharpness from top to bottom to each corner is incredible. Thanks Phil--the lens is pure delight--no doubt.

01-14-2010, 10:51 PM	#175
jgredline Pentaxian Join Date: Oct 2007 Location: LosAngeles, Ca. Photos: Albums Posts: 10,627	Time to wake this thread up with a cheesy snap shot

01-17-2010, 12:38 PM	#176
Jewelltrail Veteran Member Join Date: May 2008 Location: Rhode Island Photos: Albums Posts: 4,180 Original Poster	And here we are @ 15mm:

01-17-2010, 10:18 PM	#178
cb750r Veteran Member Join Date: Sep 2009 Photos: Gallery \| Albums Posts: 310	Granville Island in Vancouver BC

01-17-2010, 10:53 PM	#179
jgredline Pentaxian Join Date: Oct 2007 Location: LosAngeles, Ca. Photos: Albums Posts: 10,627	Originally posted by cb750r Granville Island in Vancouver BC Very Nice.

01-18-2010, 04:20 PM	#180
digitalCG Senior Member Join Date: Sep 2009 Photos: Gallery Posts: 248	Some really nice images coming out on this thread, keep it up folks! Two more recent ones, both with ND110 filter attached:

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