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05-27-2008, 11:02 AM   #1
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16mm vs 10mm

Hello.

I own a Pentax 16-45mm and I really like wide angle pictures. Sigma 10-20mm seems an excellent choice but I just was wondering how much different is 10mm (Sigma) against 16mm (Pentax). Would it be so different and would it be so much wide 10mm than 16mm?

It would be great to have a comparison on a picture so I can make my mind and then I could decide if saving money for the Sigma is interesting or not.

Thank you.

05-27-2008, 11:02 AM   #2
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10mm is much wider than 16mm

you'll get about 20-25 more workable degrees of field of view from dropping down to 10mm from 16


the higher you go up in focal length, the less of an impact it has on field of view from a utilitarian perspective, the lower, the greater the visual impact

Last edited by Gooshin; 05-27-2008 at 11:08 AM.
05-27-2008, 11:49 AM   #3
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I have both Pentax 16-50 and Sigma 10-20 and they complement each other nicely. 10mm is really a lot wider than 16mm.
05-27-2008, 12:05 PM   #4
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The difference of just over 100 deg and about 84 deg in image angle is very significant. At these short focal lengthes any single mm counts and can be noticed.

Ben

05-27-2008, 12:25 PM   #5
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QuoteOriginally posted by cooldude14es Quote
It would be great to have a comparison on a picture so I can make my mind and then I could decide if saving money for the Sigma is interesting or not.
This Tamron tool gives a reasonable idea of the effect of different focal lengths.
05-27-2008, 12:41 PM   #6
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10mm is also much more challenging (and funny) in terms of composition.
05-27-2008, 01:48 PM   #7
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QuoteOriginally posted by baw Quote
This Tamron tool gives a reasonable idea of the effect of different focal lengths.
Thanks for this tool.

And thank you everybody else for your answers.

Has anybody considered this lens? It is still not avalaible for Pentax mount but maybe soon. It seems really interesting also.

Tokina 11-16mm

Somebody on another forum gave me this link to read a review about it.

Thanks.
05-27-2008, 02:17 PM   #8
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QuoteOriginally posted by cooldude14es Quote
Thanks for this tool.

And thank you everybody else for your answers.

Has anybody considered this lens? It is still not avalaible for Pentax mount but maybe soon. It seems really interesting also.

Tokina 11-16mm

Somebody on another forum gave me this link to read a review about it.

Thanks.
on paper this is a better lens than the sigma

however its not out, so no one knows for sure.

OTOH the sigma's range into 20mm means that you will find yourself not wanting to switch lenses that often when out on the street

05-27-2008, 02:37 PM   #9
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Go for the Sigma - it's out already, it's cheaper than the 16-50, and it's been getting good reviews.
05-27-2008, 05:50 PM   #10
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The Sigma 10-20mm openned up a new world in photography to me. It is completely different to the 16mm you experienced in terms of perspective, creativities and photo opportunities. It is my most fav travel lens. I even used it for portrait sometimes, it is fun and very different to the standard portrait focal length. Check the Ultrawide portrait group in Flickr...
05-27-2008, 06:04 PM   #11
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Here's something I cooked up earlier that might be of help:

05-27-2008, 07:46 PM   #12
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POP4 - that is awesome!

Thanks for posting that.

I REALLY want that Sigma 10-20mm

Hopefully one comes into the marketplace reasonable priced one day.

D.
05-27-2008, 11:34 PM   #13
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Wow, thank you guys!!

I think I will consider this lens seriously.

Thanks.
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