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

Olympus OM-D E-M1 The first 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 30th April 2014
brian1208 brian1208 is offline
Full member
 
Join Date: Jun 2012
Location: Dorset
Posts: 4,561
Thanks: 825
Thanked 928 Times in 741 Posts
Likes: 1,962
Liked 1,327 Times in 625 Posts
comparing the 75-300mk2 with panny 35-100 on the EM-1 when shooting House Martins

Just a bit of information from a quick and dirty experiment:

As dusk fell last night the House Martins decided to play high in the air so I thought I would have a quick try at focusing on a few.

Under the available light I found that the 75-300 would only acquire focus lock if it was pre-focused and even then it struggled, if it over-shot it couldn't re-acquire a lock (not really surprising when the birds were only about 1% of the area of the frame )

When I put on the 35-100 the situation changed and I found that whilst pre-focusing was still key to getting a lock, if focus was lost the system very quickly re-acquired the bird and locked focus (this despite the fact that the birds were an even smaller percentage of frame)

I used everything from smallest single point to all points active, SAF mode and saw much the same results, the 9 point box seemed to work the "best" in this situation

I'm guessing that several factors are involved here, the wider aperture being the primary factor but also the fact that there is a shorter focal distance for the lens to traverse when searching for a lock must help

Another reason for me to look forward to the release of the 40-150 f2.8 and the 300 f4 lenses

(I'll be having another test in better light to see how that compares)
Reply With Quote
  #2  
Old 30th April 2014
TonyR TonyR is offline
Full member
 
Join Date: Oct 2013
Location: Bath
Posts: 381
Thanks: 0
Thanked 112 Times in 72 Posts
Likes: 0
Liked 119 Times in 55 Posts
Re: comparing the 75-300mk2 with panny 35-100 on the EM-1 when shooting House Martins

Interesting results.

Do you have an opinion about how 9-area compares to largest single area in zoom af mode. i.e. the box size you get when setting in 5x zoom af?

I tend to use 5x zoom AF form moving subjects because I can get it with a single press of the f2 button (provided I have set to 5x beforehand) and it is just about big enough for me to be able to track. Some have said that this mode is faster/better than 9-area.
Reply With Quote
  #3  
Old 30th April 2014
brian1208 brian1208 is offline
Full member
 
Join Date: Jun 2012
Location: Dorset
Posts: 4,561
Thanks: 825
Thanked 928 Times in 741 Posts
Likes: 1,962
Liked 1,327 Times in 625 Posts
Re: comparing the 75-300mk2 with panny 35-100 on the EM-1 when shooting House Martins

Quote:
Do you have an opinion about how 9-area compares to largest single area in zoom af mode. i.e. the box size you get when setting in 5x zoom af?
I've not tried it yet Tony so can't comment (but its something to have a go with when the mist lifts )
Reply With Quote
  #4  
Old 30th April 2014
Alpha1
Guest
 
Posts: n/a
Re: comparing the 75-300mk2 with panny 35-100 on the EM-1 when shooting House Martins

Hi Brian

I have conducted a similar test between the MZuiko 75-300ll and the Panny 100-300 with identical results on exactly the same focal lengths. I concluded that the smaller apertures on the 75-300 were the cause. The Panny lens has much bigger (and heavier!!) glass!
Reply With Quote
The Following User Says Thank You to For This Useful Post:
brian1208 (30th April 2014)
  #5  
Old 30th April 2014
brian1208 brian1208 is offline
Full member
 
Join Date: Jun 2012
Location: Dorset
Posts: 4,561
Thanks: 825
Thanked 928 Times in 741 Posts
Likes: 1,962
Liked 1,327 Times in 625 Posts
Re: comparing the 75-300mk2 with panny 35-100 on the EM-1 when shooting House Martins

thanks Dave, what's the difference, around 1 stop at the longest end? (f5.6 vs f6.7 at 300mm) I'm surprised that it makes so much difference?

(I understand it will have an effect but thought you would need at least 2 stops for it to show?)
Reply With Quote
  #6  
Old 30th April 2014
brian1208 brian1208 is offline
Full member
 
Join Date: Jun 2012
Location: Dorset
Posts: 4,561
Thanks: 825
Thanked 928 Times in 741 Posts
Likes: 1,962
Liked 1,327 Times in 625 Posts
Re: comparing the 75-300mk2 with panny 35-100 on the EM-1 when shooting House Martins

Improved light does make the expected difference, although it still needs the 75-300 to be prefocused when working at 300mm

This is a 100% crop (ISO400, f7.1 with 1/2000th sec shutter, 9 point box SAF)



with a bit more practise to get the technique re-sharpened I should have the chance to get something better / filling the frame more
Reply With Quote
  #7  
Old 30th April 2014
Maczero Maczero is offline
Full member
 
Join Date: Dec 2008
Location: Fife, Scotland
Posts: 134
Thanks: 51
Thanked 26 Times in 23 Posts
Likes: 23
Liked 24 Times in 14 Posts
Re: comparing the 75-300mk2 with panny 35-100 on the EM-1 when shooting House Martins

I think that is why I am using my old 50-200 more compared to my 75-300 II. At 3.5 at the long end it allows significantly more light in, which seems to help. On the other hand, it often needs a touch of MF prefocus (on F1) to get it in the right ball park.

It's also jolly sharp.
Reply With Quote
The Following User Says Thank You to Maczero For This Useful Post:
brian1208 (30th April 2014)
  #8  
Old 30th April 2014
brian1208 brian1208 is offline
Full member
 
Join Date: Jun 2012
Location: Dorset
Posts: 4,561
Thanks: 825
Thanked 928 Times in 741 Posts
Likes: 1,962
Liked 1,327 Times in 625 Posts
Re: comparing the 75-300mk2 with panny 35-100 on the EM-1 when shooting House Martins

A bit more time wasted peering at the sky waiting for things to appear has confirmed one more thing which seemed obvious but I hadn't systematically confirmed - the relative size of the subject compared to fame size is clearly critical.

Leaving setting constant with 300mm fl and under near identical conditions (separated by a few seconds or so) I tried shooting distant Martins (1% or less of frame width) and Gulls (around 5% + of width of frame)

Martins = zero sharp
Gulls = 80+% sharp

(the fact that the Martins are travelling considerably faster than the gulls can't be discounted either )

With the gulls, any loss of focus lock is almost instantly re-acquired (not the case with the martins)

Hazy / misty sky but bright, with light from behind
Reply With Quote
The Following 2 Users Say Thank You to brian1208 For This Useful Post:
Melaka (6th May 2014), OM USer (30th April 2014)
  #9  
Old 30th April 2014
Ian's Avatar
Ian Ian is offline
Administrator
 
Join Date: Jul 2007
Location: Hemel Hempstead, Hertfordshire, UK
Posts: 11,593
Thanks: 425
Thanked 2,534 Times in 1,274 Posts
Likes: 870
Liked 1,715 Times in 774 Posts
Re: comparing the 75-300mk2 with panny 35-100 on the EM-1 when shooting House Martins

With the slower 75-300 there should be less of a drop-off in performance when used with an E-M1 if phase-detection is in use, in theory. The lower the light the lower the contrast so CD-AF will be affected but I wouldn't have though PDAF would be similarly affected.

Ian
__________________
Founder and editor of:
Olympus UK E-System User Group (http://e-group.uk.net)
Four Thirds User (http://fourthirds-user.com)
Digital Photography Now (http://dpnow.com)
Olympus camera, lens, and accessory hire (http://e-group.uk.net/hire)

Twitter: www.twitter.com/ian_burley
Flickr: www.flickr.com/photos/dpnow/
Pinterest: www.pinterest.com/ianburley/
NEW: My personal BLOG ianburley.com
Reply With Quote
  #10  
Old 30th April 2014
brian1208 brian1208 is offline
Full member
 
Join Date: Jun 2012
Location: Dorset
Posts: 4,561
Thanks: 825
Thanked 928 Times in 741 Posts
Likes: 1,962
Liked 1,327 Times in 625 Posts
Re: comparing the 75-300mk2 with panny 35-100 on the EM-1 when shooting House Martins

Thanks Ian, an interesting input. So far, shooting these ridiculously small and fast subjects CAF has not shown any advantage over SAF, in fact I find it easier to get focus lock with SAF.

Maybe when the light is better and they get closer it will help?
Reply With Quote
The Following User Liked This Post:
Alpha1 (30th April 2014)
  #11  
Old 30th April 2014
bredman bredman is offline
Full member
 
Join Date: Apr 2012
Location: Sherwood Forest
Posts: 1,105
Thanks: 191
Thanked 142 Times in 118 Posts
Likes: 411
Liked 289 Times in 143 Posts
Re: comparing the 75-300mk2 with panny 35-100 on the EM-1 when shooting House Martins

Quote:
Originally Posted by brian1208 View Post
So far, shooting these ridiculously small and fast subjects CAF has not shown any advantage over SAF, in fact I find it easier to get focus lock with SAF.
Brian, my conclusion from the BIFs thread i started...


Quote:
Originally Posted by bredman View Post
Had a few more [sand] martins fly over earlier yesterday. CAF was useless, complete waste of time for that type of bird. Then i tried the two burst rates with SAF, it was better than CAF but not much use really. Best technique for that type of BIFfing was single shot SAF (i had anti-shock (0 secs) on too) and taking more care to find the birds and set the shot before focussing and releasing the shutter. Only this way could i move the camera fast enough to keep up with the Sandies.
__________________
__________________
Pete


https://www.flickr.com/photos/122278067@N06/
Reply With Quote
The Following User Says Thank You to bredman For This Useful Post:
brian1208 (30th April 2014)
The Following User Liked This Post:
brian1208 (30th April 2014)
  #12  
Old 30th April 2014
Alpha1
Guest
 
Posts: n/a
Re: comparing the 75-300mk2 with panny 35-100 on the EM-1 when shooting House Martins

Quote:
Originally Posted by brian1208 View Post
thanks Dave, what's the difference, around 1 stop at the longest end? (f5.6 vs f6.7 at 300mm) I'm surprised that it makes so much difference?

(I understand it will have an effect but thought you would need at least 2 stops for it to show?)
You are right in the difference on max aperture f5.6 vs f6.7, but as I say the diameter of the front element on the Panny is much more 67mm vs 58mm which translates to a much larger area of glass for light gathering. The AF(S-AF) is much more responsive in poor light on the larger Panny than the smaller mZuiko. Not much difference in good light though. I tend to chose the lens according to the weather forecast!

Although, having said that, I was shooting Otters in Devon over the last week-end in showery overcast conditions with the Oly75-300 with pleasing action results. I will post some on Photofair as soon as I have finished processing them all. my piccies are now up on Foto Fair!
Reply With Quote
The Following User Says Thank You to For This Useful Post:
brian1208 (30th April 2014)
  #13  
Old 30th April 2014
brian1208 brian1208 is offline
Full member
 
Join Date: Jun 2012
Location: Dorset
Posts: 4,561
Thanks: 825
Thanked 928 Times in 741 Posts
Likes: 1,962
Liked 1,327 Times in 625 Posts
Re: comparing the 75-300mk2 with panny 35-100 on the EM-1 when shooting House Martins

Pete, it sounds as if we have a similar experience although I have yet to try your idea of 0sec anti-shot which sounds worth a try for me

Dave, I'm sure you are right but I'm mapping out the response factors with the 75-300 and size of subject in the frame + contrast seem to be critical for good focus acquisition for that lens and the added benefit then comes from the faster aperture
Reply With Quote
  #14  
Old 1st May 2014
brian1208 brian1208 is offline
Full member
 
Join Date: Jun 2012
Location: Dorset
Posts: 4,561
Thanks: 825
Thanked 928 Times in 741 Posts
Likes: 1,962
Liked 1,327 Times in 625 Posts
Re: comparing the 75-300mk2 with panny 35-100 on the EM-1 when shooting House Martins

I'm getting better at grabbing these little blighters as they fly by at great distance and speed - just need a few closer opportunities

Another 100% crop un-resized, against a high bright mist cover ISO400, f6.7 at 300mm with 1/8000th sec

Reply With Quote
  #15  
Old 1st May 2014
bredman bredman is offline
Full member
 
Join Date: Apr 2012
Location: Sherwood Forest
Posts: 1,105
Thanks: 191
Thanked 142 Times in 118 Posts
Likes: 411
Liked 289 Times in 143 Posts
Re: comparing the 75-300mk2 with panny 35-100 on the EM-1 when shooting House Martins

Quote:
Originally Posted by brian1208 View Post
Pete, it sounds as if we have a similar experience although I have yet to try your idea of 0sec anti-shot which sounds worth a try for me
Brian, it wasn't an idea of sorts, i just have it on constantly with the 75-300. The recent upgrade gave this lens a new lease of life on my camera.
__________________
__________________
Pete


https://www.flickr.com/photos/122278067@N06/
Reply With Quote
The Following User Says Thank You to bredman For This Useful Post:
brian1208 (1st May 2014)
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
More examples using the 75-300mk2 at 300mm on the EM-1 post v1.3 brian1208 Foto Fair 21 10th April 2014 04:05 PM
More Sand Martins Tordan58 Foto Fair 2 10th July 2013 06:35 AM
Sand Martins Tordan58 Foto Fair 4 30th June 2013 12:12 PM
Swifts and Sand Martins in Flight Olybirder Foto Fair 13 30th May 2013 06:29 AM
Fledgling House Martins David Morison Foto Fair 3 12th July 2011 02:45 AM


All times are GMT. The time now is 11:27 AM.


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