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Messages - Phenix205

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Lenses / Re: Review: Sigma 50mm f/1.4 DG HSM Art Lens
« on: April 29, 2014, 12:14:10 PM »
i'm waiting for someone to complain about the bokeh.... :P

I smell some onion in it.

Lenses / Re: Review: Sigma 50mm f/1.4 DG HSM Art Lens
« on: April 25, 2014, 07:36:45 AM »
All that said, I'm surprised nobody has been discussing how odd it seems that AI Servo was apparently ok, but One Shot on a tripod wasn't...Any conjecture?

With a static subject and on a tripod, the reviewer should have been using "Live View" (contrast based focus) and focused through that and should not have used the normal TTL method of focusing. This would then allow the review to check that the camera was no longer vibrating (at 10x view) when they took the photo: depending on the residual motion, 2 seconds is not always enough to allow the camera to become still.

This makes me think that there are some questions to be asked about the procedures used by the reviewer as they have obviously been found wanting.

Live View focusing uses different communication protocols with the lens. Using that method would not have tested the lens' performance with PDAF, which was the whole point of the test.  A 2 s delay should be quite sufficient at a 50mm FL, given the quality of support gear that Bryan has (I have ample shots – thousands – taken for AFMA to support that assertion).

Where can I find information about which communication protocol(s) are used between the body and lens for each different type of autofocus method?

I don't quite understand why you've included a reference to AFMA there. Can you please explain what you're saying more clearly?

Was the distance from the lens to the subject matter mentioned?
i.e. can we calculate what the DoF was so that we know if the focus was out a lot or a little?

but I'm curious to know how he tested the ability of the lens to focus correctly.
Is it just line up the camera, then repeat half press for focus and shoot ten times?
Or does he manual focus to infinity and then focus-shoot for each test?
Or is it focus and hold the shutter down for 10 shots?

It's the peanut gallery commentator who has been found wanting, as is frequently the case on this forum.

Who was it that said that scientific testing should detail what and how in depth?

I trust Bryan like many of us here do. I doubt he just randomly shot some photos then made made some comments on his own website without thinking it through. If you have a different approach for testing AF, I'd be very interested in hearing about it. Or you can just post a summary of what you find out using your protocol.

Lenses / Re: Review: Sigma 50mm f/1.4 DG HSM Art Lens
« on: April 22, 2014, 01:50:43 PM »
Is there a lens out there that never has occasional AF inconsistency?

Does a 40% miss rate really constitute occasional inconsistency?  I think not...

Compare this to Zeiss missing 100% of AF shots  ;)

My thoughts exactly!  Hey, at under a grand, this lens offers most of the performance of the Zeiss, but it sucks because the AF is inconsistent while the Zeiss with no AF and 4x the cost is awesome?   :o

As Bryan said, if you buy and use it as an MF lens, nothing beats its excellent value. Most people rely on AF in majority of shooting situations, and if it is indeed as bad as 40% missing rate, it's just a shame for such a high optical quality lens. Look forward to hearing from more on the AF consistency tests. 

Lenses / Re: Review: Sigma 50mm f/1.4 DG HSM Art Lens
« on: April 22, 2014, 12:46:52 PM »
I was wondering how the AF consistency test would turn out with this lens using FoCal. Most of Canon's new lenses get 99% AF consistency. If this one is in the 60-70% range, I may just wait for the Canon's new version. Sharpness is meaningless if focus is missed.

I agree. I have one. I can put 5D3 + 70-200 2.8L II, 24-70 II, 16-35, 50, and a flash by using the side pockets and top pocket.

There's also the new f-stop Kenti, with quick access ports on both sides.  I've been eyeing that model myself.

Lenses / Re: Sigma 50mm F/1.4 Art listed in Belarus for $790
« on: March 20, 2014, 11:18:41 PM »
I sold my Canon 50 1.4 immediately after Sigma announced the 50 Art. Before this, I had never thought about buying a third party lens. Can't wait for it to arrive in the US market.

Lenses / Re: 24-70 II Onion Ring Bokeh
« on: December 20, 2013, 10:36:17 PM »
Sorry, should've attached the 100% crop one.

Lenses / 24-70 II Onion Ring Bokeh
« on: December 20, 2013, 10:33:02 PM »
Merry Christmas Everyone.

I've been using my 24-70 II since April. Love it to pieces. Never really paid much attention to the bokeh until I took some photos of the Christmas light. Very very prominent onion ring bokeh. First I thought it might be the filter, but the same thing happened when I took off the filter.

Any thoughts? Is it inherent with this lens design or something is wrong with my specific copy?


EOS-M / Re: Some EOS M Information [CR1]
« on: August 20, 2013, 11:36:23 PM »
Shooting video with the current M is a bloody pain in a butt. I like the manual exposure control but the AF sucks big time. I am not expecting huge improvement on the still image quality but do wish Canon do something intelligent on the video function (70D sensor or better) and make the next M look better.

Pricewatch Deals / Re: Deal: EOS M w/22mm f/2 STM & 90EX $399
« on: August 09, 2013, 04:55:41 PM »
I like the little guy. Not very powerful but very portable and does a relatively decent job for what it can do. It's more powerful than the built-in flash in many high-end mirrorless cameras. And it can trigger my 600-RT.

EOS-M / Re: EOS M Flash Diffuser
« on: August 04, 2013, 11:27:13 AM »
It's sold for $1.99 on the rainbowimaging website. But you need to order more than $15 to get your order fulfilled. So I ordered a hand strap and a few other small items.

EOS-M / Re: EOS-M Annoyances
« on: July 27, 2013, 08:57:00 AM »
It is annoying. Almost every time when I pulled it out of the camera bag, it got turned on because I accidentally pressed the Play button.

EOS-M / Re: EOS M 22 pancake lens cap
« on: July 20, 2013, 09:32:44 AM »
thanks MrFotoFool for the link. I might order one for same reason.

I will add more M lenses, only in pancake style.
It takes time to get the screw-in cap off, but it's good when in the bag/pocket. Will go to my local camera store to see if an old styled side pinch cap could be found. Very thick cap with a tiny hood on a pancake lens. Sometimes just couldn't figure out what the designer was thinking.

 I'd love to see more fast pancake primes too.

EOS Bodies / Re: EOS M Stock & Shipping Update
« on: July 17, 2013, 04:50:02 PM »
Twenty years from now, this first M will be sold on ebay as a "classic," and all the nostalgia buffs will pay top dollar for them.

Hang on to them if you've got them.
Those with the original firmware would be sold at higher price as they were truly the "original" M by Canon.  ;)

EOS-M / Re: How do you carry your EOS-M?
« on: July 13, 2013, 07:44:04 PM »
I ended up getting a wrist strap used for the wii remote controller. It should be adequate to prevent accidental drop or even some swings.

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