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Author Topic: sigma 120-300 review at petapixel  (Read 4361 times)

pwp

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Re: sigma 120-300 review at petapixel
« Reply #15 on: November 02, 2013, 06:57:04 PM »
I replied to your lengthy post several times...you seem tho think you are some kind of moderator here. Policing what you don't like to hear. My comments and 1st hand disappointment on this lens hasn't changed so why should my opinion?
Moderators are (thankfully) here to put a clamp on illegal and disruptive postings, and their judgment is made based on personal and individual decisions. What I called you out on in that past thread is your technical illiteracy. We do not need moderators or judges to decide on this, I suffices if we look at facts and numbers. I showed you the numbers and explained the facts back then, and you seemed to have accepted them back then, only to start with the same BS here all over again.

If you really think your 70-200L with its internal focusing gives you anywhere near 200mm focal length at minimum focus distance, I have a bridge to sell you. If you keep implying this nonsense despite being shown otherwise, it is apparently you who is trying to sell us a bridge here. Or something else ...

Ahem....keep it nice. Part of what makes CR a quality destination is the prevailing friendliness and tolerance of viewpoints, skill levels, opinions and grasp of language.

-pw

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Re: sigma 120-300 review at petapixel
« Reply #15 on: November 02, 2013, 06:57:04 PM »

candc

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Re: sigma 120-300 review at petapixel
« Reply #16 on: November 02, 2013, 07:28:59 PM »
But more than anything, I think it's the hefty 2950g / 104oz spec that keeps my Visa card in this weakling's wallet..
http://www.sigmaphoto.com/product/120-300mm-f28-ex-dg-os-apo-hsm
-pw
thats the old version, the new one is even heavier!
http://www.sigmaphoto.com/product/120-300mm-f28-dg-os-hsm-s
Thanks for picking that up.
Whoa! The new model is a full 440g (or 15.6 oz) heavier! That's 3,390g / 119.6oz.
Canon 70-200 f/2.8isII is 1,490g
Canon 300 f/2.8isII is a svelte 2,400g

-pw

i know that canon did a good job of making the series ii super teles lighter, maybe sigma will do that next and use titanium instead of depleted uranium?

Rudeofus

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Re: sigma 120-300 review at petapixel
« Reply #17 on: November 03, 2013, 04:08:58 AM »
Ahem....keep it nice. Part of what makes CR a quality destination is the prevailing friendliness and tolerance of viewpoints, skill levels, opinions and grasp of language.
A friendly and tolerant resource becomes useless if people intentionally and against their better knowledge post misleading statements to push some agenda. My stern tone may have been a bit over the line (sorry for that), but the essence still stands: CR will turn into KR style laughing stock if we let marketing drones, shills and fan boys take over the show.

AlanF

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Re: sigma 120-300 review at petapixel
« Reply #18 on: November 03, 2013, 05:40:10 AM »
Rude
You wrote in another thread where you were arguing with GMC: "I leave it as an exercise to the reader to search the web for information how much shorter the 70-200  F/2.8 L IS II gets at nearest focus distance. It's all there for anyone to read.".

During my searching for that information, I read a lot of articles about lens design, including some very illuminating ones about Nikon 80-400 zooms, showing how different designs give different changes in focal length on focussing. But, I could not find the information about the 70-200mm, perhaps because of my ineptitude. As the tone of your comment implies that you have that data, please put me out of my misery and post the right link.
« Last Edit: November 03, 2013, 06:15:04 AM by AlanF »
5D III, 70D, Powershot SX50, 300/2.8 II, 1.4xTC III, 2xTC III, 70-200/4 IS, 24-105, 15-85, Sigma 10-20, Tamron 150-600.

Apop

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Re: sigma 120-300 review at petapixel
« Reply #19 on: November 03, 2013, 05:58:46 AM »
No doubt it's a good lens and it delivers for the price.
But the problem for me was the price on this one, When introduced it was about the same price (or slightly more) as a used canon 300 f2.8 IS , I would guess the latter holds it's value better and perform slightly better.

A further price drop would be nice , I mean really it's still 4500 $ here (3300 euros).
When it drops below 3000$ I will be more interested again.

Rudeofus

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Re: sigma 120-300 review at petapixel
« Reply #20 on: November 03, 2013, 01:18:42 PM »
During my searching for that information, I read a lot of articles about lens design, including some very illuminating ones about Nikon 80-400 zooms, showing how different designs give different changes in focal length on focussing. But, I could not find the information about the 70-200mm, perhaps because of my ineptitude. As the tone of your comment implies that you have that data, please put me out of my misery and post the right link.
The data can be found on photozone, see the table at the bottom of that page (The content of that page is written in English language despite the .de domain of that site). According to this table the 70-200 L IS II has a focal length of 172mm at minimum focus distance, the older 70-200 L IS ends at a focal length of 161mm.

Please note that this is a design characteristic of internally focusing lenses and in no way an optical deficiency or a flaw of these lenses. If we add a 1.4x teleconverter to the 70-200 L IS II as suggested by GMC, we end up with 241mm and F/4 which is similar to the 120-300 at minimum focus distance but a full aperture stop dimmer (with the respective effect on shutter speed, DOF and bokeh).

candc

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Re: sigma 120-300 review at petapixel
« Reply #21 on: November 03, 2013, 07:03:15 PM »
got a chance to use the lens with extenders today a bit. i have not tried the sigma 2x because i have seen some images taken with it and they don't look very good. i have tried it with the canon 2xiii and the promaster 2x and 1.4. the promaster 2x can give good results but its quirky and inconsistent. the promaster 1.4x is good but the one that i have gets soft on the left side wide open. the canon 2xiii works really well on this lens and would recommend it. the rusty ball and the squirrel are at 600, the cat is 240, all taken with a 70d

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Re: sigma 120-300 review at petapixel
« Reply #21 on: November 03, 2013, 07:03:15 PM »

AlanF

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Re: sigma 120-300 review at petapixel
« Reply #22 on: November 03, 2013, 07:13:58 PM »
They are much, much better at 600mm than you would have expected from the TDP iso tests.
5D III, 70D, Powershot SX50, 300/2.8 II, 1.4xTC III, 2xTC III, 70-200/4 IS, 24-105, 15-85, Sigma 10-20, Tamron 150-600.

candc

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Re: sigma 120-300 review at petapixel
« Reply #23 on: November 03, 2013, 07:47:51 PM »
They are much, much better at 600mm than you would have expected from the TDP iso tests.

that's what i thought too. you would think it would be better with their own brand of tc but with this combo it looks like the canon 2xiii is the way to go.

GMCPhotographics

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Re: sigma 120-300 review at petapixel
« Reply #24 on: November 04, 2013, 04:31:10 AM »
They are much, much better at 600mm than you would have expected from the TDP iso tests.
Stop down 2/3 of a stop to f6.3 and it sharpens up nicely. Its certainly a sharp lens, it's nearly as sharp as a Canon prime no question. I'm not sure I'd want to use a 2x TC on a 1.6x crop camera...that's pushing it a bit too far for critical sharpness. But on a full frame, a 2 x TC and a stop drop works very well. I used a Canon 2x mkII and a Canon 1.4x mkII & III. The 1.4x hardly drops any quality and can easily be used wide open. The 2X, not quite so well. 

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Re: sigma 120-300 review at petapixel
« Reply #24 on: November 04, 2013, 04:31:10 AM »