Wide aperture - Pictures out of focus

Started Aug 3, 2014 | Discussions thread
tedolf Forum Pro • Posts: 27,165
Re: Faster shutter speeds........

Christof21 wrote:

tedolf wrote:

Christof21 wrote:

tedolf wrote:

Christof21 wrote:

AnthonyL wrote:

Jizzy wrote:

tedolf wrote:

So, stop down to about f/8 and you will get a DOF of about 8-10 inches.

Now, you have to ask yourself why did you spend so much money for a f/1.8 lens when you really can't use it wide open for the types of photo's you want to shoot!


Yeah, thats what I am asking myself now

Yes - just get a P&S - no probs with DOF there!

Or stop down the lens, same results. This is not a "problem"

There are some situations where you can't stop down. Like where you need a faster shutter speed to avoid subject motion blur, e.g. father/daughter waltz at a wed

You should read articles about equivalence. You can always shoot an "equivalent" picture with the bigger sensor. The opposite is not true.


The "problem" is that you are paying a lot of money for a fast aperture

You should compare lenses with an equivalent aperture to be fair. With Full Frame for instance, you pay a lot for the body. Not so much for the lenses, it is sometimes even cheaper (considering the equivalent aperture)

that is usable only in very rare circumstances. I think a lot of beginning photographers get "suckered" into paying a lot of $$ for a really fast lens when an f/2.8 lens of the same model would cost a lot less and work just as well in the real world.

Having a fast aperture can make a big difference in the real world ! I have a 23mm on APS-C and I can take advantage of the f1.4 aperture without problems in low light for instance. This is 2 stops better than f2.8. As soon as your subject is a bit distant, the dof increases quickly.

yes, there are definitely situations where having a fast aperture is a huge advantage and that is my point. I think with a smaller sensor, that large aperture is usable more often than with a larger sensor. Your point about APS-c is well taken. I think it is a more usable format than FF. The problem with most (Nikon/Canon) is that they reserve their best lenses for the FF system and let APS-c be the poor step-child. The newer formats (4/3, Fuji, etc.) started from scratch and gave those systems their best lenses.

Instead of "usable", you should use the word limited or restricted... You try to present a disadvantage as if it was an advantage...

Just let each format have their advantages/disadvantages.

I don't think we have any disagreement here.

Each format has its advantages and disadvantages.

I was simply commenting in the context of the specific picture the OP was trying to take with the  equipment he has.

Have a look also at the picture of doss. Is f1.8 a problem ?

It is worth spending a bit of time checking what your lens can do wide open and stopped down a touch. But as pointed out elsewhere the focus confirmation can kick in sooner than you think and not necessarily on what you thought it focussed on. Use static subjects and if you haven't got a tripod then find something to stand the camera on and use a time delay.

Also double check your technique. Need to be very precise and steady.




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