Olympus UK E-System User Group
Olympus UK E-System User Group

Join our unique resource for Olympus Four Thirds E-System DSLR and Pen and OM-D Micro Four Thirds photographers. Show your images via our free e-group photo gallery. Please read the e-group.uk.net forum terms and conditions before posting for the first time. Above all, welcome!


Go Back   Olympus UK E-System User Group > Cameras, lenses and system accessories > Camera conference > Micro Four Thirds > Olympus OM-D E-M1 Mark II

Olympus OM-D E-M1 Mark II The second Micro Four Thirds camera that offers phase detect focusing so you can use Four Thirds DSLR lenses normally as well a Micro Four Thirds lenses.

Reply
 
Thread Tools Display Modes
  #1  
Old 7th August 2019
Willom's Avatar
Willom Willom is offline
Full member
 
Join Date: Aug 2010
Location: Hertfordshire
Posts: 339
Thanks: 39
Thanked 31 Times in 31 Posts
Likes: 50
Liked 70 Times in 40 Posts
C-AF preferring the background

I finally have some free time in which to play with my not so new MkII. This morning I was out on the water attempting to photograph seals in the water. Sadly, in most of the photos, the background was in focus more often than the subject.

I was using my 4/3rds 70-300mm at the top end and the camera was set up with a single focus point and C-AF and sequential low silent. I used shutter priority with the shutter set at 1/1000 and ISO 800.

To make it difficult I was low to the water and bobbing around in a kayak so there was a lot of potential for the background to feature in the images. Understanding the conditions I want to try to force the camera to focus somewhere in the vicinity of where the subject rather than the background (which I assume is at infinity). To avoid stressing the animals I was about 50m to 100m from them (unless they got curious and came to me) so I am right on the limit of the lense.

I was thinking of adjusting the aperture to f11 or f14 to increase the depth of field to assist the AF (or increase the chances of the subject being I'm the field of view) but I am not sure if that would work.

I tried using five focus points yesterday but more often than not the focus just behind or in front of the subject (although the conditions were a bit different).

I'll try to post some photos later but I need to remember how to.

I know I am attempting to sprint before I can crawl but I don't get these opportunities very often, any ideas will be greatly appreciated.
Reply With Quote
  #2  
Old 7th August 2019
DerekW DerekW is online now
Full member
 
Join Date: Nov 2007
Location: Hampshire
Posts: 3,106
Thanks: 92
Thanked 337 Times in 264 Posts
Likes: 33
Liked 542 Times in 380 Posts
Re: C-AF preferring the background

Have you installed the very latest firmware for the camera for details see previous threads
__________________
This space for rent
Reply With Quote
  #3  
Old 7th August 2019
Wildwood Wildwood is offline
Full member
 
Join Date: Jan 2017
Location: dfdsfsdf
Posts: 133
Thanks: 0
Thanked 34 Times in 33 Posts
Likes: 63
Liked 56 Times in 37 Posts
Re: C-AF preferring the background

Quote:
Originally Posted by Willom View Post

To make it difficult I was low to the water and bobbing around in a kayak so there was a lot of potential for the background to feature in the images. Understanding the conditions I want to try to force the camera to focus somewhere in the vicinity of where the subject rather than the background (which I assume is at infinity). To avoid stressing the animals I was about 50m to 100m from them (unless they got curious and came to me) so I am right on the limit of the lense.

I was thinking of adjusting the aperture to f11 or f14 to increase the depth of field to assist the AF (or increase the chances of the subject being I'm the field of view) but I am not sure if that would work.

I tried using five focus points yesterday but more often than not the focus just behind or in front of the subject (although the conditions were a bit different).

I'll try to post some photos later but I need to remember how to.

Stopping down will not affect the AF because the camera performs AF with the lens wide open. At 50m the head of a bobbing seal is going to be rather small in the viewfinder and thus difficult for the AF to lock on to. Using anything larger than a single focus point will only make this worse. In most areas the seals will come much, much closer of their own accord so patience is the order of the day. I find C-AF+TR works well for photographing seals from a boat.
__________________
Best wishes

Wildwood
Reply With Quote
  #4  
Old 7th August 2019
Growltiger Growltiger is offline
Full member
 
Join Date: Dec 2016
Location: UK
Posts: 310
Thanks: 2
Thanked 94 Times in 68 Posts
Likes: 9
Liked 72 Times in 54 Posts
Re: C-AF preferring the background

Before you try anything else, follow these three steps.

1. Make sure you are using firmware 3.1. This is most important in your case.
2. Try single focus point.
3. Use C-AF not +TR.
Reply With Quote
  #5  
Old 7th August 2019
MikeOxon MikeOxon is offline
Full member
 
Join Date: Nov 2017
Location: oxford
Posts: 601
Thanks: 61
Thanked 107 Times in 93 Posts
Likes: 63
Liked 246 Times in 153 Posts
Re: C-AF preferring the background

I only tend to turn to C-AF for fast moving subjects like birds in flight. For subjects like Seals (recently photographed in the Scillies)

I prefer S-AF, which is very fast to acquire on the E-M1 Mk.ii, especially if you pre-focus on the sea where the Seal is bobbing up and down. Make sure you use small focus points, to minimise distraction by the background. ( I'm not sure whether this actually works with C-AF, where the camera tends to use phase detection, which only operates at specific points) You could also try Pro-capture to anticipate the moment when a head pops up.
__________________
Mike
visit my Natural History Photos website:
http://home.btconnect.com/mike.flemming/
Reply With Quote
  #6  
Old 7th August 2019
Willom's Avatar
Willom Willom is offline
Full member
 
Join Date: Aug 2010
Location: Hertfordshire
Posts: 339
Thanks: 39
Thanked 31 Times in 31 Posts
Likes: 50
Liked 70 Times in 40 Posts
Re: C-AF preferring the background

Thank you all for your quick responses.

I don't have the latest firmware as I am still trying to figure out how to install it as my laptop runs on Linux instead of Windows or Apple.

They are indeed small in the viewfinder. I wanted to use C-AF as these seals do porpoise at certain times and I would love to photograph that behavior. One of today's images have one almost standing on it's tail. Shame the tress a mile away are in sharp focused and the seal is nicely blurred.

I'll see if I can update the firmware but will also try on S-AF with burst.
Reply With Quote
  #7  
Old 7th August 2019
MJ224's Avatar
MJ224 MJ224 is offline
Full member
 
Join Date: May 2016
Location: Carmarthenshire
Posts: 13,819
Thanks: 946
Thanked 749 Times in 695 Posts
Likes: 6,951
Liked 3,816 Times in 1,762 Posts
Re: C-AF preferring the background

Alternative is to use manual focus with peaking.....

With slow moving objects such as seals, you should be able to see precisely (?) what is in focus...

When taking birds photos, I quite often use MF, as the poor camera is not sure what I want......
__________________
Mark Johnson

My Sailing Page

My Flickr
Reply With Quote
  #8  
Old 7th August 2019
Growltiger Growltiger is offline
Full member
 
Join Date: Dec 2016
Location: UK
Posts: 310
Thanks: 2
Thanked 94 Times in 68 Posts
Likes: 9
Liked 72 Times in 54 Posts
Re: C-AF preferring the background

I would suggest you stick with S-AF until you have upgraded to 3.1
3.1 is a huge improvement for C-AF.
Can't you borrow a PC for 10 minutes?
Reply With Quote
  #9  
Old 8th August 2019
Ross the fiddler's Avatar
Ross the fiddler Ross the fiddler is offline
Full member
 
Join Date: Apr 2010
Location: Blue Mtns, NSW Australia
Posts: 14,231
Thanks: 2,090
Thanked 1,339 Times in 1,044 Posts
Likes: 5,535
Liked 2,181 Times in 1,163 Posts
Re: C-AF preferring the background

I do not know of any method to update your firmware with using Linux, unless the LightSnowDev method can do it.

Another thing, also make sure your 70-300 lens is updated too (not possible through LightSnow Dev though) as it should be at FW 1.4 released in February 2012.
https://cs.olympus-imaging.jp/en/sup...s/ed70_300.cfm

Quote:
ZUIKO DIGITAL ED 70-300mm F4.0-5.6 Firmware Update
ZUIKO DIGITAL ED 70-300mm F4.0-5.6 Firmware Ver1.4
has incorporated the following upgrade.
[Modification]
Focusing during MF operation has been improved.
* Upgrade history *
ZUIKO DIGITAL ED 70-300mm F4.0-5.6 Firmware Ver1.3
has incorporated the following upgrade.
Resolved unstable sequential shooting when using C-AF on the E-3 and E-30.
ZUIKO DIGITAL ED 70-300mm F4.0-5.6 Firmware Ver1.2
has incorporated the following upgrade.
IMAGER AF is available when supported by the camera. *Depending on the condition of the subject, the focusing speed near the telephoto end may slow down to maintain focusing accuracy.
ZUIKO DIGITAL ED 70-300mm F4.0-5.6 Firmware Ver1.1
has incorporated the following upgrade.
Stabilized exposure precision.
__________________
Ross
I fiddle with violins (when I'm not fiddling with a camera).
Flickr: https://www.flickr.com/photos/ross-the-fiddler/
Cameras: OM-D E-M1 & Mk II, Olympus Stylus 1, OM-D E-M5.
Lenses: M.ZD7-14mm f2.8 PRO Lens, M.ZD12-40mm f2.8 PRO Lens, M.ZD40-150mm f2.8 PRO Lens, MC-14, MC-20, M.ZD12-50, M.ZD60 Macro, M.ZD75-300 Mk II, MMF-3, ZD14-54 II, Sigma 150mm F2.8 APO Macro DG HSM.
Flashes: FL36R X2, FL50R, FL50.
Software: Capture One Pro 10 (& Olympus Viewer 3).
Reply With Quote
  #10  
Old 8th August 2019
MikeOxon MikeOxon is offline
Full member
 
Join Date: Nov 2017
Location: oxford
Posts: 601
Thanks: 61
Thanked 107 Times in 93 Posts
Likes: 63
Liked 246 Times in 153 Posts
Re: C-AF preferring the background

You can downloaded the firmware files from https://lightsnowdev.com/Olympus/OMD/OMD-E-M1II.html then copy the (large) file to an SD card after re-naming as per the instructions.


Save your setting first because they will be lost when using this method.
__________________
Mike
visit my Natural History Photos website:
http://home.btconnect.com/mike.flemming/
Reply With Quote
  #11  
Old 8th August 2019
kbouk kbouk is offline
Full member
 
Join Date: Oct 2013
Location: Piraeus - Greece
Posts: 64
Thanks: 1
Thanked 28 Times in 16 Posts
Likes: 0
Liked 7 Times in 6 Posts
Re: C-AF preferring the background

There is another solution, try focus limiter function on camera menu. You can set 3 different preset areas (camera focus inside one of them) and if you assign a button for the function (focus limiter) keep press this button and with back dial you can change to one of the three different areas.
If you don’t know the distance to assign it on focus limiter you can use another camera function (ΜF prefocus) to measure as a distance laser.
Reply With Quote
The Following User Says Thank You to kbouk For This Useful Post:
OM USer (8th August 2019)
  #12  
Old 8th August 2019
wornish's Avatar
wornish wornish is offline
Senior Member
 
Join Date: Sep 2015
Location: Cheshire
Posts: 6,043
Thanks: 341
Thanked 548 Times in 428 Posts
Likes: 2,850
Liked 1,594 Times in 787 Posts
Re: C-AF preferring the background

Quote:
Originally Posted by kbouk View Post
There is another solution,...........

If you don’t know the distance to assign it on focus limiter you can use another camera function (ΜF prefocus) to measure as a distance laser.

Your last sentence about using the MF prefocus as a distance laser is interesting.
How exactly do you do that. Are you saying simply MF and then read off the focus distance from the lens focusing ring or is there a way to get a more accurate read out of the actual distance possible?

I have looked at the exif data and it doesnt seem to show the focus distance.
__________________
Dave

My Flickr
Reply With Quote
  #13  
Old 8th August 2019
Wildwood Wildwood is offline
Full member
 
Join Date: Jan 2017
Location: dfdsfsdf
Posts: 133
Thanks: 0
Thanked 34 Times in 33 Posts
Likes: 63
Liked 56 Times in 37 Posts
Re: C-AF preferring the background

As a point of interest how many of you who are offering solutions have actually photographed seals from a boat?
__________________
Best wishes

Wildwood
Reply With Quote
  #14  
Old 8th August 2019
kbouk kbouk is offline
Full member
 
Join Date: Oct 2013
Location: Piraeus - Greece
Posts: 64
Thanks: 1
Thanked 28 Times in 16 Posts
Likes: 0
Liked 7 Times in 6 Posts
Re: C-AF preferring the background

Quote:
Originally Posted by wornish View Post
Your last sentence about using the MF prefocus as a distance laser is interesting.
How exactly do you do that. Are you saying simply MF and then read off the focus distance from the lens focusing ring or is there a way to get a more accurate read out of the actual distance possible?

I have looked at the exif data and it doesnt seem to show the focus distance.
PreMF is an AF mode actually (inside AF menu after SAF,CAF,CAF+TR....), it makes the lens focus only at the one focal distance , you can set and lock any AF capable lens (first when you choose it hit info and then the shutter) to a predefined focus distance between 0 to 999.9(infinity). When you use it the camera focus at one point (first info then shutter) you will see also the focus distance on the LCD, try it.

The AF limiter function is a different one and you will find it inside camera’s menu, you have up to 3 presets to program the camera to rack focus only within the range(x-y) that you specify with specific values.
Reply With Quote
The Following User Says Thank You to kbouk For This Useful Post:
wornish (8th August 2019)
  #15  
Old 8th August 2019
MJ224's Avatar
MJ224 MJ224 is offline
Full member
 
Join Date: May 2016
Location: Carmarthenshire
Posts: 13,819
Thanks: 946
Thanked 749 Times in 695 Posts
Likes: 6,951
Liked 3,816 Times in 1,762 Posts
Re: C-AF preferring the background

Quote:
Originally Posted by Wildwood View Post
As a point of interest how many of you who are offering solutions have actually photographed seals from a boat?


Aground, fate sealed


by Mark Johnson, on Flickr

__________________
Mark Johnson

My Sailing Page

My Flickr
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Black background ? Antonio Correia The lounge 26 19th February 2018 12:05 PM
HELP! How to Shoot with Blurred Background jamaljan Olympus Pen E-P1 6 19th March 2014 11:36 PM
Help - Portable background sponner Accessory talk 5 3rd February 2013 10:30 PM
Non crease white background Macca1980 General accessories 10 26th September 2012 09:54 AM
Artificial background? No, just looks like it :-) Cathrine Stephansen Foto Fair 10 6th June 2011 08:16 PM


All times are GMT. The time now is 10:11 PM.


The Write Technology Ltd, 2007-2019, All rights reservedAd Management plugin by RedTyger