Approve the Cookies
This website uses cookies to improve your user experience. By using this site, you agree to our use of cookies and our Privacy Policy.
OK
Index  •   • New posts  •   • RTAT  •   • 'Best of'  •   • Gallery  •   • Gear  •   • Reviews
Guest
New posts  •   • RTAT  •   • 'Best of'  •   • Gallery  •   • Gear  •   • Reviews
Register to forums    Log in

 
FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 09 Jun 2013 (Sunday) 10:28
Search threadPrev/next
sponsored links
(this ad will go away when you log in as a registered member)

f1.2 lenses low light focusing

 
uOpt
Goldmember
Avatar
2,283 posts
Likes: 3
Joined Jun 2009
Location: Boston, MA, USA
     
Jun 13, 2013 07:16 |  #16

Malsam wrote in post #16013853 (external link)
Anyone experience any issues in low light focusing using the 50 and 85 f1.2L? Recently I took a lot of photos of my daughter in a dimly lighted crib and I find occasional haunting of the AF points on a 50 f1.2L and 85 f1.2L on both my 5D3 and 6D. I seldom use them (these lenses and bodies) for low light so I'm not sure is it common.

Is that with fluorescent lights?


My imagine composition sucks. I need a heavier lens.

  
  LOG IN TO REPLY
sponsored links
(this ad will go away when you log in as a registered member)
snake0ape
Goldmember
Avatar
1,223 posts
Gallery: 3 photos
Best ofs: 1
Likes: 11
Joined Jan 2007
Location: Los Angeles
     
Jun 13, 2013 08:30 |  #17

Malsam wrote in post #16026619 (external link)
I haven't have much issues with 24-70 f4L though but I'll still get some haunting from time to time and if I on the flourescent light, then the light source will be complicated by will be bright enough though.

That is very odd that a zoom f4 is out performing a prime f 1.2 in terms of low light auto focus. How close are you from the child? I'll try to simulate the situation with mine. If you have two light sources, how much contrast is there looking at the eyes? LEDs?


I am assuming your 85ii has no focus issues at that distance with a brighter light source.


5Diii | 50D | 8-15L 4| 16-35L 2.8 II| 24-70L 2.8 II | 70-200L 2.8 IS II |Tamy 150-600 | Σ35Art 1.4 | 40 2.8 | Σ50Art 1.4 | 85L 1.2 II | 100 2.8 Macro | Helios 44-3 58mm f2.0 |Helios 40-1 85mm f1.5 | 1.4x & 2x teleconverters

  
  LOG IN TO REPLY
Malsam
THREAD ­ STARTER
Senior Member
Avatar
382 posts
Joined Feb 2010
Location: SG
     
Jun 13, 2013 10:31 |  #18

uOpt wrote in post #16026833 (external link)
Is that with fluorescent lights?

My room is lighted by 2 bulbs which are warming and they are bouncing towards the ceiling due to the way I place them. I do have a main fluorescent source which when I on it I won't have any problem.

snake0ape wrote in post #16026993 (external link)
That is very odd that a zoom f4 is out performing a prime f 1.2 in terms of low light auto focus. How close are you from the child? I'll try to simulate the situation with mine. If you have two light sources, how much contrast is there looking at the eyes? LEDs?

I am assuming your 85ii has no focus issues at that distance with a brighter light source.

For the 24-70 f4L, I just feel the faster AF makes the focusing more stable. Yup I do commit this mistake when I'm too near but my 5D3 was set to red up inside the view finder when its in focus in low light.


Gear Stuffs

  
  LOG IN TO REPLY
Wilt
Reader's Digest Condensed version of War and Peace [POTN Vol 1]
Avatar
41,788 posts
Gallery: 1 photo
Likes: 2562
Joined Aug 2005
Location: Belmont, CA
     
Jun 13, 2013 10:55 |  #19

snake0ape wrote in post #16026993 (external link)
That is very odd that a zoom f4 is out performing a prime f 1.2 in terms of low light auto focus.


We should not forget that the Canon dSLR uses PHASE difference detection AF, not contrast detection AF. That may account for why an f/4 zoom seems to AF better in lower light than the f/1.2 lens.


You need to give me OK to edit your image and repost! Keep POTN alive and well with member support https://photography-on-the.net/forum/donate.p​hp
Canon dSLR system, Olympus OM 35mm system, Bronica ETRSi 645 system, Horseman LS 4x5 system, Metz flashes, Dynalite studio lighting, and too many accessories to mention

  
  LOG IN TO REPLY
snake0ape
Goldmember
Avatar
1,223 posts
Gallery: 3 photos
Best ofs: 1
Likes: 11
Joined Jan 2007
Location: Los Angeles
     
Jun 13, 2013 11:43 |  #20

Malsam wrote in post #16027311 (external link)
For the 24-70 f4L, I just feel the faster AF makes the focusing more stable. Yup I do commit this mistake when I'm too near but my 5D3 was set to red up inside the view finder when its in focus in low light.

Ahhh. Its the new 24-70 f4L. You have the best AF lens here. I read that these newer lens has an "open loop" communication with the newer camera bodies like your 6D/5Diii. So with phase detection, camera send instructions to lens, lens don't like it, send camera back with another set of directions....looping back and forth till there is some kind of agreement. With the older lens like the 85L, camera sends instructions to lens and that is it. But newer bodies are better than the old ones, with the phase detection system they take into account CA signatures and light wavelengths, so its better than older bodies since Phase detection gets confused with what is in focus since "purple" is out of sync (oof) with "green" wavelengths.

I will test out my 85L tonight to see if how low "contrast" I can go in dim lights.


5Diii | 50D | 8-15L 4| 16-35L 2.8 II| 24-70L 2.8 II | 70-200L 2.8 IS II |Tamy 150-600 | Σ35Art 1.4 | 40 2.8 | Σ50Art 1.4 | 85L 1.2 II | 100 2.8 Macro | Helios 44-3 58mm f2.0 |Helios 40-1 85mm f1.5 | 1.4x & 2x teleconverters

  
  LOG IN TO REPLY
cdang
Senior Member
263 posts
Likes: 6
Joined Dec 2011
     
Jun 13, 2013 11:44 |  #21

smorter wrote in post #16016032 (external link)
85LII is terrible with 5D3 in low light

Much better after firmware fix

I wasn't aware the new firmware helped low light focusing. Care to elaborate ? I thought it was just bad while using speedlites. Thanks in advance.




  
  LOG IN TO REPLY
Stu ­ Scully
Member
90 posts
Likes: 2
Joined Sep 2008
Location: Baton Rouge, LA
     
Jun 13, 2013 12:21 |  #22

cdang wrote in post #16027586 (external link)
I wasn't aware the new firmware helped low light focusing. Care to elaborate ? I thought it was just bad while using speedlites. Thanks in advance.

The new firmware fixes an issue with the AF assist beams with Canon flashes. Now it is suppose to work much more reliably and provide better low-light focusing. I don't do a ton of low light shooting with flashes but since I have installed the firmware I have had no noticeable issues with not locking focus at night with a 600EX.




  
  LOG IN TO REPLY
snake0ape
Goldmember
Avatar
1,223 posts
Gallery: 3 photos
Best ofs: 1
Likes: 11
Joined Jan 2007
Location: Los Angeles
     
Jun 13, 2013 23:54 |  #23

OP ask how does the 85 1.2 perform in low light. Mine worked fine in very low light. I had to go into a dark room with some light leak from the door in order to get my 85 1.2 to start hunting in low light. It is hard to describe without measuring instruments, but for what it is worth:

I took out 4 lens and shot in low low light to test which is the low light winner for AF.
85 1.2
35L 1.4
S35L 1.4
24-70ii

Basically I shot a hand fan on the wall in a dark room. The only light source was some light leaking from the door. I closed the door tighter and tighter, allow less and less light, until one lens fail to achieve focus or started to hunt for more than a second.

Of the 4 lens I tested, the 35L wins (but not by much)
second was the S35.
Third was the 85L (close to S35)
And not surprisingly, last is the 24-70ii. (still not by much)
I should have also test out my 50s, but its in my other bag.

All of these lens performed very well in low light. I can't say that anyone of these should avoid low light photography.


5Diii | 50D | 8-15L 4| 16-35L 2.8 II| 24-70L 2.8 II | 70-200L 2.8 IS II |Tamy 150-600 | Σ35Art 1.4 | 40 2.8 | Σ50Art 1.4 | 85L 1.2 II | 100 2.8 Macro | Helios 44-3 58mm f2.0 |Helios 40-1 85mm f1.5 | 1.4x & 2x teleconverters

  
  LOG IN TO REPLY
smorter
Goldmember
Avatar
4,506 posts
Likes: 18
Joined Nov 2007
Location: Melbourne, Australia
     
Jun 14, 2013 01:35 |  #24

cdang wrote in post #16027586 (external link)
I wasn't aware the new firmware helped low light focusing. Care to elaborate ? I thought it was just bad while using speedlites. Thanks in advance.

I have no evidence but it seems more sensitive in low light now, even without AF assist. At least as good as the 40D now.


Wedding Photography Melbourneexternal link
Reviews: 85LII

  
  LOG IN TO REPLY
cdang
Senior Member
263 posts
Likes: 6
Joined Dec 2011
     
Jun 14, 2013 05:34 |  #25

Stu Scully wrote in post #16027699 (external link)
The new firmware fixes an issue with the AF assist beams with Canon flashes. Now it is suppose to work much more reliably and provide better low-light focusing. I don't do a ton of low light shooting with flashes but since I have installed the firmware I have had no noticeable issues with not locking focus at night with a 600EX.

Yes I'm aware of that. I was saying if it was better without the speedlites.

smorter wrote in post #16029578 (external link)
I have no evidence but it seems more sensitive in low light now, even without AF assist. At least as good as the 40D now.

Thanks. I haven't noticed but will pay closer attention and try to notice it for myself.




  
  LOG IN TO REPLY
Malsam
THREAD ­ STARTER
Senior Member
Avatar
382 posts
Joined Feb 2010
Location: SG
     
Jun 14, 2013 11:25 as a reply to  @ cdang's post |  #26

Wilt wrote in post #16027418 (external link)
We should not forget that the Canon dSLR uses PHASE difference detection AF, not contrast detection AF. That may account for why an f/4 zoom seems to AF better in lower light than the f/1.2 lens.

snake0ape wrote in post #16027582 (external link)
Ahhh. Its the new 24-70 f4L. You have the best AF lens here. I read that these newer lens has an "open loop" communication with the newer camera bodies like your 6D/5Diii. So with phase detection, camera send instructions to lens, lens don't like it, send camera back with another set of directions....looping back and forth till there is some kind of agreement. With the older lens like the 85L, camera sends instructions to lens and that is it. But newer bodies are better than the old ones, with the phase detection system they take into account CA signatures and light wavelengths, so its better than older bodies since Phase detection gets confused with what is in focus since "purple" is out of sync (oof) with "green" wavelengths.

I will test out my 85L tonight to see if how low "contrast" I can go in dim lights.

Gee...didn't know that kind of technologies behind these new lenses bw!. I got it for my wife because she likes to do close up food shots...maybe I should trade with her ;)

cdang wrote in post #16027586 (external link)
I wasn't aware the new firmware helped low light focusing. Care to elaborate ? I thought it was just bad while using speedlites. Thanks in advance.

I do notice these older lens performed considerably better in the newer bodies. My 1v die on me recently so I can't remember how they sound on older bodies but after I gotten the 24-70 IS, I do find that the older lenses like the 50L and 85L sound quite differently upon the shutter release.

Stu Scully wrote in post #16027699 (external link)
The new firmware fixes an issue with the AF assist beams with Canon flashes. Now it is suppose to work much more reliably and provide better low-light focusing. I don't do a ton of low light shooting with flashes but since I have installed the firmware I have had no noticeable issues with not locking focus at night with a 600EX.

Hmm...so still need to on that. Do you guys leave it on? I find it irritating especially with the sound.

snake0ape wrote in post #16029445 (external link)
...Of the 4 lens I tested, the 35L wins (but not by much)
second was the S35.
Third was the 85L (close to S35)
And not surprisingly, last is the 24-70ii. (still not by much)
I should have also test out my 50s, but its in my other bag.

All of these lens performed very well in low light. I can't say that anyone of these should avoid low light photography.

Sorry you mean your 24-70 II has the best low light focusing or 35L?

Anyway just an update....keeping in mind what you guys had suggested, I tried it again yesterday night...still 2 monochrome light source, take note of the minimal focusing distance of the lenses, focus on the eyes, hold my breath and surprisingly I got it most of them now! Not much haunting and when I review on the LCD with the focusing screen point displayed, I'm pleasantly surprise that they are all in focus on the eyes!

Thanks you guys for the tips and reminders! I shall start shooting more indoor shots than outdoors now! :p


Gear Stuffs

  
  LOG IN TO REPLY
snake0ape
Goldmember
Avatar
1,223 posts
Gallery: 3 photos
Best ofs: 1
Likes: 11
Joined Jan 2007
Location: Los Angeles
     
Jun 14, 2013 23:34 |  #27

Malsam wrote in post #16030706 (external link)
Sorry you mean your 24-70 II has the best low light focusing or 35L?

 :p

35L is best of the 4 for low light AF.


5Diii | 50D | 8-15L 4| 16-35L 2.8 II| 24-70L 2.8 II | 70-200L 2.8 IS II |Tamy 150-600 | Σ35Art 1.4 | 40 2.8 | Σ50Art 1.4 | 85L 1.2 II | 100 2.8 Macro | Helios 44-3 58mm f2.0 |Helios 40-1 85mm f1.5 | 1.4x & 2x teleconverters

  
  LOG IN TO REPLY
Malsam
THREAD ­ STARTER
Senior Member
Avatar
382 posts
Joined Feb 2010
Location: SG
     
Jun 15, 2013 20:22 |  #28

snake0ape wrote in post #16032566 (external link)
35L is best of the 4 for low light AF.

Ah I c...thanks for telling me that. This lens is a good to have item in my list lolz. Something more to add on to justify 1 :cool:


Gear Stuffs

  
  LOG IN TO REPLY
sponsored links
(this ad will go away when you log in as a registered member)

3,314 views & 0 likes for this thread
f1.2 lenses low light focusing
FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
AAA
x 1600
y 1600

Jump to forum...   •  Rules   •  Index   •  New posts   •  RTAT   •  'Best of'   •  Gallery   •  Gear   •  Reviews   •  Member list   •  Polls   •  Image rules   •  Search   •  Password reset

Not a member yet?
Register to forums
Registered members may log in to forums and access all the features: full search, image upload, follow forums, own gear list and ratings, likes, more forums, private messaging, thread follow, notifications, own gallery, all settings, view hosted photos, own reviews, see more and do more... and all is free. Don't be a stranger - register now and start posting!


COOKIES DISCLAIMER: This website uses cookies to improve your user experience. By using this site, you agree to our use of cookies and to our privacy policy.
Privacy policy and cookie usage info.


POWERED BY AMASS forum software 2.1forum software
version 2.1 /
code and design
by Pekka Saarinen ©
for photography-on-the.net

Latest registered member is Birdie760
611 guests, 302 members online
Simultaneous users record so far is 15144, that happened on Nov 22, 2018

Photography-on-the.net Digital Photography Forums is the website for photographers and all who love great photos, camera and post processing techniques, gear talk, discussion and sharing. Professionals, hobbyists, newbies and those who don't even own a camera -- all are welcome regardless of skill, favourite brand, gear, gender or age. Registering and usage is free.