Join for FREE
It only takes a minute!
Zeiss - Always on the lookout for something special – Shop now

Welcome to BirdForum.
BirdForum is the net's largest birding community, dedicated to wild birds and birding, and is absolutely FREE! You are most welcome to register for an account, which allows you to take part in lively discussions in the forum, post your pictures in the gallery and more.

ISO auto or ISO manual?

Thread Tools Rating: Thread Rating: 7 votes, 5.00 average.
Old Tuesday 24th September 2013, 13:59   #1
Registered User

Join Date: Feb 2013
Location: Royston, Herts
Posts: 22
ISO auto or ISO manual?

Please could I have some opinions or wether using ISO on auto or manual control when in apperture mode or shutter mode is best practise !

Many thanks Johnno65
Johnno65 is offline  
Reply With Quote
Old Tuesday 24th September 2013, 19:51   #2
Roy C
Occasional bird snapper
Roy C's Avatar

Join Date: Feb 2005
Location: Barnstaple,North Devon,UK
Posts: 16,253
Originally Posted by Johnno65 View Post
Please could I have some opinions or wether using ISO on auto or manual control when in apperture mode or shutter mode is best practise !

Many thanks Johnno65
Depends on the Camera, your method of shooting (pod or hand held) and lens you are shooting Johnno. With the 40D auto ISO was cr#p but on the 7D it is great for bird photography, it is one less thing to worry about in the field.

With the 7D and handholding a non IS lens like the 400/5.6 it is a god send as you can use Tv mode to control the shutter speed and let the ISO take care of its self. When you use auto ISO in TV mode on the 7D almost always uses a wide open aperture which is great for a lens like the 400/5.6 but not so good for lenses that need to be stopped down.

In AV mode and Auto ISO the shutter speed returned is around focal length x crop factor of the Camera so with a 400mm lens on the 7D it returns a shutter speed of around 1/640sec - if this suits you needs then great but obviously no good for things like flyers where you need a faster shutter speed.

BTW on the 7D you can dictate the max ISO used in auto ISO by setting the max allowed in the menu.

When you use auto ISO the Camera will use 1/3 stop ISO's even if you have your Camera set for full stops only. A few years ago some intermediate ISO's were considered to be nosier than the next up full ISO but nowadays the algorithm used to calculate expose with these intermediate ISO has got a lot better and I have not problems whatsoever using intermediates.

For crop Camera's other than the 40D and 7D I cannot comment on how good or otherwise auto ISO is has I have no experience.

Hope this helps John.

Last edited by Roy C : Tuesday 24th September 2013 at 19:53.
Roy C is offline  
Reply With Quote

BF Supporter 2007 Support BirdForum With A Donation


Thread Tools
Rate This Thread
Rate This Thread:

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

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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Combined Manual-Auto Discovery cdninva Digiscoping Adapters 1 Sunday 22nd May 2011 02:14
Auto ISO on 7D Roy C Canon 10 Thursday 24th March 2011 15:30
Manual or Auto focus which do you use the most? Tog Technique 16 Tuesday 4th May 2010 11:27
auto vs manual focus neil brown Technique 3 Monday 28th December 2009 09:29
Auto FX-Auto Eye software. christineredgate Photoshop, Paintshop and Printing 18 Thursday 1st December 2005 21:07


Fatbirder's Top 1000 Birding Websites

Help support BirdForum

Page generated in 0.14109612 seconds with 14 queries
All times are GMT. The time now is 05:02.