DOF and Cropping take 2

Started Feb 11, 2014 | Discussions thread
moving_comfort Veteran Member • Posts: 8,227
Re: What the heck is a cropped image ( with the 645d)

awaldram wrote:

Ian Stuart Forsyth wrote:

Now looking at the photos above, myself and many others would say this is about the worse way to compare image across formats we want to compare DOF with image that have the same FOV as this is how we photograph. We use things like DOF, FOV, perspective & focal point as visual aids in conveying our creative work, so why not use these key segments in photography >>> and god said let there be Equivalency<<<< to evaluate formats.

Because as a photographer you shoot with the tool in your hand, you do not equate it to anything.

So, if you shoot with a P&S and someone asks what focal length that shot was at, you would say "5mm" and leave it at that? Or would you perhaps say something like "well, 5mm on my P&S, which is equivalent to about 24mm." Which, by the way, is what the P&S vendor does, as do review sites, and the information is often automatically available in Exif viewers.

Equivalency is just a conversion tool, it's not your enemy, it doesn't 'prove' anything about your equipment choice right or wrong when taken out of context.


As we’ve already proved Perceived DoF will alter both at capture time and when presented depending on viewing distance.

And crop amount, when displayed at the same size - which you, yourself have unwittingly demonstrated several times, although you argue that you haven't


the reality is you will adjust Focal length or subject distance as you shoot to create the correct composition DoF is a secondary concern and only a ball park ideal.

It may or may not be a 'secondary concern' to you or anyone - that's not the same thing as saying it doesn't change with format (or cropping.) You seem to vacillate between "It's not true" and "well, it doesn't matter anyway."


-- hide signature --

Here are a few of my favorite things...

 moving_comfort's gear list:moving_comfort's gear list
Pentax K20D Nikon D800 Nikon AF-S DX Nikkor 35mm F1.8G Nikon AF-S Nikkor 300mm f/4D ED-IF Nikon AF Nikkor 20mm f/2.8D +10 more
Post (hide subjects) Posted by
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark MMy threads
Color scheme? Blue / Yellow