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Converters, adapters and extension tubes All those lens accessories that get in between the lens and the camera.

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  #31  
Old 14th January 2013
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Re: EC-20 and 50-200 SWD

Hi,

My contribution to the detailed inspection...

I dug out the some bird photos taken the past summer taken in "realistic field conditions" (good light and at quite some distance) showing what I have been able to achieve with the 50-200 SWD + EC20 and the E-620 body.

Used monopod and IS.1 so any shake blur should be virtually eliminated.

I picked the sharpest shots from series from focus and motion blur point of view.

RAW images process in DXO Optics, using the default profile. 50-200 SWD is supported so the optics correction module is applied.

I have cut out a 1024x768 portion of the photos for 100% scale rendering.


What do you think about the sharpness?





#1 Great Egret
Distance to subject: 70 meters
ISO 400
F/9
1/1000 s
Comment: slight CA is visible. Focus is correct (not visible on the crop, but visible on the full size picture). Slightly soft.



#2 Ruddy Turnstone
Distance: 15 meters
ISO 400
F/8
1/2000 s

Comment: I should have stepped down further, was not anticipating the subject. Some back focus but not much.



#3 Sanderling
Distance: 22 meters
ISO 400
F/9
1/1000 s

Comment: back focus is noticeable, impacts the sharpness.



#4 Whinchat
Distance: 19 meters
ISO 400
F/8
1/200 s

Comment: 1/200 s should be fast enough with IS.1 and monopod. Hard to judge if focus is right or not, but since there are no other elements in the picture I guess it is right. Slightly soft.

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Old 14th January 2013
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Re: EC-20 and 50-200 SWD

@Tordan58

How did you knew the distance to the subject ? Or is just an aproximation ?

The sharpness is not that bad for 100%, but not usable at 100%. Maybe with resize + sharpen, looks ok.
50-200 alone produces pictures wich you can use even if you crop at 100%, but sometimes is not long enough.

I got sharper photos than you when with this combo. I will post tonight some 100% samples.

I saw now that you have Sigma 50-500. How is it at 100% ? Sharp enough ?
Worth to use it instead of 50-200 + EC-14 ?
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Re: EC-20 and 50-200 SWD

Quote:
Originally Posted by katran View Post
@Tordan58

How did you knew the distance to the subject ? Or is just an aproximation ?
You can read the distance in the EXIF data.

Quote:
Originally Posted by katran View Post
@Tordan58
The sharpness is not that bad for 100%, but not usable at 100%. Maybe with resize + sharpen, looks ok.
50-200 alone produces pictures wich you can use even if you crop at 100%, but sometimes is not long enough.
I agree.

Quote:
Originally Posted by katran View Post
@Tordan58
I got sharper photos than you with this combo. I will post tonight some 100% samples.
Looking fwd to see them. Maybe the E5 makes a difference. Maybe the AF system on the E620 is fooled by the EC20?

Quote:
Originally Posted by katran View Post
@Tordan58
I saw now that you have Sigma 50-500. How is it at 100% ? Sharp enough ?
Worth to use it instead of 50-200 + EC-14 ?
It is sharper at 400mm. Sharpness drops as you venture into the long end of the zoom range but still beats my 50-200 + EC20 combo. The drawback is weight. I would pick the Sigma over the 50-200 SWD + EC20 unless restricted by weight restrictions (e.g. flight travel).

For the record, the 50-200 + EC14 is sharper that the Sigma.


Regards
/Tord
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Last edited by Tordan58; 14th January 2013 at 09:55 AM. Reason: E5 vs E620
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Re: EC-20 and 50-200 SWD

Quote:
Originally Posted by Tordan58 View Post
You can read the distance in the EXIF data.
Are you sure ? As far as I know, this is working only with Sigma lenses.
With Olympus lenses this information is not available.

I checked now the exif of my pictures, but I could not find the distance to the subject.
Can you give more details here ? Wich program you used to read the exif and what is the name of the tag wich contains the distance to the subject.

Thank you in advance !
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Re: EC-20 and 50-200 SWD

Quote:
Originally Posted by katran View Post
Are you sure ? As far as I know, this is working only with Sigma lenses.
With Olympus lenses this information is not available.

I checked now the exif of my pictures, but I could not find the distance to the subject.
Can you give more details here ? Wich program you used to read the exif and what is the name of the tag wich contains the distance to the subject.

Thank you in advance !
Hi,

The information is in tag 9206 Hex / 37382.
For instance:
Tag hex Tag Name Type Value Text value
9206 37382 ExifSubjectDist 5 18650/1000

An easy way to inspect the EXIF is using EXIFeditor from Kiwi Software. You can download it from here.

/Tord
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Re: EC-20 and 50-200 SWD

This information is gold. You are great. Thank you so much !
I will try and if I do not have succes to find the info, I will let you know.

And this evening I will come back with 100% samples made with E-5 + 50-200 + EC-20.

If you feel yout E-620 + EC20-combo has a focus problem, worths to try live-view mode too. If you notice an sharpness improvment, than it can be that focus does not make a very good job all the time.
I am sure that in some conditions (especially low light) focus system fails to do a perfect job when using EC20 (maybe because of F/7.0).
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Re: EC-20 and 50-200 SWD

Now I tried Exif Editor.

I opened one of my pictures, but I could not found "9206 37382 ExifSubjectDist".

I found "9205" and "9207", but could not found "9206".

What do you think ?

Maybe only the SWD version can measure the distance.
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Re: EC-20 and 50-200 SWD

One thing I could do is to calibrate the AF system to check it if there is a systematic bias when using the 50-200/EC20.
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Re: EC-20 and 50-200 SWD

Ok, but what about my last post ?

I tried ExifEditor. Still do not see "9206 37382 ExifSubjectDist".
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Re: EC-20 and 50-200 SWD

Quote:
Originally Posted by katran View Post
Now I tried Exif Editor.

I opened one of my pictures, but I could not found "9206 37382 ExifSubjectDist".

I found "9205" and "9207", but could not found "9206".

What do you think ?

Maybe only the SWD version can measure the distance.
Hi

I checked on a few files, my own as well as some downloaded from the forum. I noticed a few things.
  • All of the files I have created have this EXIF tag. I have been using E520 and E620/E600 over time.
  • The tag has a reasonable value when AF lenses have been used. I checked files taken with Zuiko 9-18, 12-60, 50mm, 50-200, 70-300, and also Sigma 50-500
  • When used with non-AF lenses (e.g. legacy Zuiko 50mm or my telescope) it is present but has a default value 6395/1000, same value for each file. (The value may, or may not, come from the AF confirm dandelion chip I am using, but this does not matter. What matters is that the tag is there and has an arbitrary value).
  • None of the files I have seen created with the E3 or E5 have this tag.

What I guess is that the tag is camera body dependent, and the observations above indicate that it is regardless of lens make and model.

Possible explanations?
  • It could be that the E3/E5 do not support/discard this tag.
  • It could be that it is supported but is hidden under another name, however none of the E3/E5 tags I found in EXIF Editor resemble "distance", and none of the values are close to what you would expect
  • It could be that the processing SW that generates JPG discards this tag. Have you checked your RAW files to see if the tag is there?

/Tord
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Re: EC-20 and 50-200 SWD

Thank you again !

I also have raw files, but could not find this tag.

I have a friend wich is using E-620 + 50-200 SWD + EC-14 and I asked him to send me an picture with exif.
I could not found in that picture neither the distance tag.

Now I have the feeling that maybe I am looking wrong.
Can you post here a printscreen with that tag to see how it looks, because maybe I am looking wrong or in a wrong place ?
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Re: EC-20 and 50-200 SWD

Here are two screenshots showing how the EXIF in the photo of the Whinchat looks like on my computer: http://e-group.uk.net/gallery/showgallery.php?cat=1550

For easy reference below are all the tags exported from the file:
Tag hex Tag Name Type Value Text value
10E 270 ImageDescription 2 OLYMPUS DIGITAL CAMERA
10F 271 EquipMake 2 OLYMPUS IMAGING CORP.
110 272 EquipModel 2 E-620
112 274 Orientation 3 1 Horizontal (normal)
11A 282 XResolution 5 314/1
11B 283 YResolution 5 314/1
128 296 ResolutionUnit 3 2 inches
131 305 SoftwareUsed 2 DXO Optics Pro v6
132 306 DateTime 2 2012:09:04 07:35:08
829A 33434 ExifExposureTime 5 1/200
829D 33437 ExifFNumber 5 80/10
8822 34850 ExifExposureProg 3 3 Aperture-priority AE
8827 34855 ExifISOSpeed 3 400
9000 36864 ExifVer 7 0221
9003 36867 ExifDTOrig 2 2012:09:04 07:35:08
9004 36868 ExifDTDigitized 2 2012:09:04 07:35:08
9204 37380 ExifExposureBias 10 0/10
9205 37381 ExifMaxAperture 5 1273/256
9206 37382 ExifSubjectDist 5 18650/1000
9207 37383 ExifMeteringMode 3 5 Multi-segment
9208 37384 ExifLightSource 3 0 Unknown
9209 37385 ExifFlash 3 8 On, Did not fire
920A 37386 ExifFocalLength 5 400/1
927C 37500 ExifMakerNote 7 OLYMPUS
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Re: EC-20 and 50-200 SWD

PS
If you provide me an E5 RAW file I could have a look at it later this evening to see if I find anything that resembles a tag holding distance information. You can email it to me, I will PM you an email address.
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Re: EC-20 and 50-200 SWD

Thanks again for the info !

I sent to you to gmail address, an raw file made with E-5 and 50-200.
It is only 11 Mb, size should not be a problem for an mailbox.

If you have time to have a look....it is not a hurry. When you have time . Thank you in advance !

Maybe from now on is better to continue discussing by mail about this subject or maybe to open a new thread about exif-distance-to-subject, to avoid off-topic.
It was an very interesting information, thanks to tordan58.

Of course, here we will continue with new samples and informations about 50-200 + EC20 combo.
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Re: EC-20 and 50-200 SWD

I will post now the 100% samples : E-5 + 50-200 mk1 + EC-20.

Picture 1 - 400mm, F/9.0
Original picture resized to 1600x1200 :


And 100% crop :


Picture 2 - 400 mm F/9.0
Original picture resized to 1600x1200:


And 100% crop :


Picture 3 - 316mm F/9.0
Original picture resized to 1600x1200:


And 100% crop :


Picture 4 - BIF 316mm, F/9.0
Original picture resized to 1600x1200:


And 100% crop:
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