An FX 70-300 used at F5.6 at 300mm will not let in less light than a DX version of the same zoom. That is pure nonsense put out by Tony Northrup who has a tenuous relationship with the facts on this.

Where it makes sense to adjust aperture to compensate for crop factor, to a point, is when considering depth of field for the "same" composition. Clearly for the same composition with a 300mm on a full frame camera, you'd have to move back with a crop sensor camera and the same 300mm lens, increasing your depth of field. To get the same depth of field with the 300mm on the full frame camera you'd have to close the lens down a bit. But this has absolutely nothing to do with whether the lens is a DX or FX lens. I suggest you to to a store, put a DX 70-300 on your DX camera, then put an FX 70-300. You'll see that they will pretty much provide the same thing, provided the light transmission (T-Stop) is comparable.

Another validation is to look at any light meter. Does it have a scale or compensation for when you use an FX lens on a DX camera?

Follow your gut and question everything that just doesn't sound right.

Gene

Tony did show that when one uses the same lens on a crop and full frame camera, the crop camera image background is more in focus than the Full Frame camera image.

In the meantime, can you point me to the page where Nikon says aperture must be multiplied by crop factor?

Great question and hard to answer without a peek at his wings. Here's what one expert site says"

Falcon: A medium-size bird of prey with long pointy wings and tends to be a very swift flier. Falcons catch smaller birds in the air with swift, spectacular dives, called stoops. In cities they are masterful at catching pigeons. Elsewhere they feed especially on shorebirds and ducks. They often sit on high perches, waiting for the right opportunity to make their aerial assault.

Hawk : A medium sized bird found mainly in woodlands hunting by sudden dashes from a concealed perch. It usually has a long tail for tight steering. Their flight is an accipiter like pattern of intermittent flaps and glides.

Did it fly away eventually? Did you get a look at the wings just like S/S says long a narrow it's a flacon, short and blunt it's a hawk. I'm going to look around a little more and see what I can see. I found a photo of a sharp shinned hawk that looks pretty much like what you saw. take a look and tell me what you think.



https://www.carolinabirdclub.org/gallery/images/Sharp-shinned%20Hawk%202%20Underwood.jpg

Great question and hard to answer without a peek at his wings. Here's what one expert site says"

Falcon: A medium-size bird of prey with long pointy wings and tends to be a very swift flier. Falcons catch smaller birds in the air with swift, spectacular dives, called stoops. In cities they are masterful at catching pigeons. Elsewhere they feed especially on shorebirds and ducks. They often sit on high perches, waiting for the right opportunity to make their aerial assault.

Hawk : A medium sized bird found mainly in woodlands hunting by sudden dashes from a concealed perch. It usually has a long tail for tight steering. Their flight is an accipiter like pattern of intermittent flaps and glides.

Did it fly away eventually? Did you get a look at the wings just like S/S says long a narrow it's a flacon, short and blunt it's a hawk. I'm going to look around a little more and see what I can see. I found a photo of a sharp shinned hawk that looks pretty much like what you saw. take a look and tell me what you think.


I have attached a better image. No the bird did not look like image that you attached.



https://www.carolinabirdclub.org/gallery/images/Sharp-shinned%20Hawk%202%20Underwood.jpg

Dear All,
I plan to enter our State Fair Fine Art contest this year. Each entrant is allowed to submit only TWO photographs. I've narrowed my possible choices down to FOUR. So .... I'm hoping that I might count on the UHH community to help me choose the best two to enter. The PHOTOGRAPHY JUDGING CRITERIA are:
Impact - Composition - Creativity - Technical Aspects - Presentation. (presentation can't really be assessed here as I won't invest in the mounting/framing until after I've narrowed my choice.) BUT ... suggestions for mat color - or whether to go with stretched canvas with no frame - would also be appreciated.
Thanks all,
Tim