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Messages - tron

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886
EOS Bodies - For Stills / Re: F/8 Autofocusing impressions
« on: May 20, 2013, 06:21:12 AM »
Finally I found time to test my 5D3 with a 300mm f/4 (non-iS) lens with EF2X II teleconverter.
The test was inside my house and not much light.

It worked fine  :)
More information about "not much light"

Shutter: 1/50 Aperture: f/8 ISO: 25600

According to an EV calculator I found it worked fine to 3.6EV.

Next step would probably be to use half the lights I used...

887
EOS Bodies - For Stills / Re: F/8 Autofocusing impressions
« on: May 20, 2013, 05:21:30 AM »
Finally I found time to test my 5D3 with a 300mm f/4 (non-iS) lens with EF2X II teleconverter.
The test was inside my house and not much light.

It worked fine  :)


888
EOS Bodies - For Stills / Re: F/8 Autofocusing impressions
« on: May 19, 2013, 12:00:14 PM »
I was surprised that Canon hadn't included f/8 AF on that body right from the start. Perhaps they needed to iron out some issues first, I don't know.
+1 Same with the 1DX. As it was replacing 1D4 (at least!) it was very strange that they omitted this feature initially.

889
EOS Bodies - For Stills / Re: F/8 Autofocusing impressions
« on: May 18, 2013, 11:42:29 AM »
I don't like being an "early adopter" (although this firmware update is not exactly a totally new thing), but reading these comments has convinced me to go ahead and install it.
Firmware seems fine :)  Just read the instructions. The part at the end that says to remove the battery for a few seconds seems new to me. I remember members of this forum mentioning the same thing for the 7D upgrade but I do not remember this instruction for the 5DMkII firmware updates.

(Or there was and I simply omitted it and I didn't know it!! )

891
EOS Bodies - For Stills / Re: F/8 Autofocusing impressions
« on: May 17, 2013, 01:21:57 PM »
Someone please explain this f/8 brouhaha to me: my 5D3 + Kenko 1.4x tele-extender + 400 & 70-300 auto-focus (at f/8, pre-firmware update) all day long. I just downloaded the firmware update and will install it later today, but I've been auto-focusing just fine at f/8 for some time. Am I missing something?

You are missing ... Canon teleconverters which report the correct maximum aperture to camera.

When you put kenco with your say 400 f/5.6 lens does it report it as having a maximum f/8 aperture? I guess not! It still reports it as f/5.6!

You have effectively a 1.4X400 = 560mm f/8 lens but the camera thinks it is connected to a f/5.6 maximum aperture lens and tries to autofocus!

When my Kenko is attached to my EF 400 f/5.6 lens, the 5D3 tells me that the max aperture available is f/8. It auto-focuses just fine (I used it that way between my last post and this post). The EXIF data in Lightroom lists the lens as the EF 400 f/5.6, but the images display the correct EXIF data: f/8. So, tron, maybe I'm still not seeing something, but this all jives.
That's interesting for Kenko! However, everyone who had Canon teleconverters could not have this option!

So as I said before it wasn't possible with Canon teleconverters...

892
EOS Bodies - For Stills / Re: F/8 Autofocusing impressions
« on: May 17, 2013, 10:55:03 AM »
Someone please explain this f/8 brouhaha to me: my 5D3 + Kenko 1.4x tele-extender + 400 & 70-300 auto-focus (at f/8, pre-firmware update) all day long. I just downloaded the firmware update and will install it later today, but I've been auto-focusing just fine at f/8 for some time. Am I missing something?

You are missing ... Canon teleconverters which report the correct maximum aperture to camera.

When you put kenco with your say 400 f/5.6 lens does it report it as having a maximum f/8 aperture? I guess not! It still reports it as f/5.6!

You have effectively a 1.4X400 = 560mm f/8 lens but the camera thinks it is connected to a f/5.6 maximum aperture lens and tries to autofocus!

893
Lenses / Re: Poll: Most Wanted New Lenses of 2013.
« on: May 17, 2013, 09:07:07 AM »
I would LOVE to see the return of DO lenses, Got to use a 400 f/4 DO today and it was a joy, the contrast/color is a bit off but super easy to fix in post.
+100000 !!!!

I would be interested but this lens' IQ has been controversial.

Some say it is very good, some not (some determine 2003 as the make year that made the difference.

I remember correctly at the-digital-picture site the 400DO didn't take the teleconverters well (IQ wise).

894
EOS Bodies - For Stills / Re: F/8 Autofocusing impressions
« on: May 17, 2013, 09:01:28 AM »
If I could afford it, I would preorder the 200-400 but that is not an option(My Wife clarified that for me).
Does she have the same hard feelings for EF500 f/4L IS II ?  ;D

895
Lenses / Re: I have a weight limit....what would you bring?
« on: May 17, 2013, 05:17:10 AM »
Right now, I am planning to bring my 70-200 f/4 IS, my 24-104, and my 17-40.

Do you really need to fill that 40-70mm gap? 17-40L + 70-200/4L IS could be enough.
OP seems to have one camera so that would cause lens change more often. Still it remains an interesting combination...

896
Lenses / Re: Poll: Most Wanted New Lenses of 2013.
« on: May 17, 2013, 05:11:57 AM »
Can we have ALL please ? (wishful thinking) ;D

Seriously though, that would be extremely bad for our wallets. It's better having each one every year or two (more wishful thinking)  ;D

897
Lenses / Re: When is the New 100-400 Coming?
« on: May 17, 2013, 05:04:28 AM »
If they produce a 100-400 that's a "twist" and is as light and small as my 70-200 F/4 IS with 4 stop IS and IQ as good as what we've got now, and if the price is less than $2000, I would jump.  But, that is impossible form an engineering and design and financial perspective.
If I were to just guess (I obviously have NO inside information) I would say that it would look like the bigger (and  heavier) brother of 70-300L ... Now the price would be higher too...

898
Lenses / Re: Can the 70-200 2.8L II IS replace my 100L and 135L?
« on: May 16, 2013, 09:15:58 PM »
I find it extremely hard to sell Lenses I no longer use so much, almost like selling my Children.
I understand what you mean.

But, I sold lenses I didn't like or need (and the battery grip of my stolen 40D) and saved a lot of money getting new camera and ... L lenses.

Only 1 was an L lens. The others were old non-L from the end of 80s or the early 90s (and 2 of them were SIGMA lenses)

So it depends.

899
Lenses / Re: Can the 70-200 2.8L II IS replace my 100L and 135L?
« on: May 16, 2013, 09:06:24 PM »
They are different. I cannot comment on 100L since I do not have it but I have the other two.

135mm: discrete, light, excellent for shooting at f/2.0 - f/2.2
70-200m: Excellent but... heavy and conspicuous.

But, it all depends on the specific use. Also I take with me either but not both depending on what I want to do.

I admit I enjoy the 135 more. But this is subjective...

(Sorry I didn't help)

900
The Samyang's 14mm distortion is only a problem for architectural photography. You will have no problem for the type of photography you want.
Keep in mind the 500 rule:

500 / <lens focal length> is about the maximum you can shoot in seconds to avoid star trails.

So for Samyang 14mm it is 500/14 = a little more than 30sec (35sec actually so 30sec is a rather safe selection).

Even so you will see some star trails at 100% or more...

The more the megapixels the more star trails you get for the same exposure!

Since 40D is an APS-C camera it has the pixel density of a 10*1.6*1.6 = 25.6 Mpixels.
You may need to decrease the exposure to less than 30sec.

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