Crop sensor /lens question: I currently have a D750, D7200 and a D5300. I only have 3 DX lenses. I understand that using my pro-grade lenses on my crop bodies I have a 1.5 crop ratio.

TMurphy71

I currently have a D750, D7200 and a D5300. I only have 3 DX lenses. I understand that using my pro-grade lenses on my crop bodies I have a 1.5 crop ratio. My question is......Is it the same when using the DX lenses or is a DX24mm actually 24mm?

Mac Loc: Pittsburgh, Philadelphia now Hernando Co. Fl.

TMurphy71 wrote:

I currently have a D750, D7200 and a D5300. I only have 3 DX lenses. I understand that using my pro-grade lenses on my crop bodies I have a 1.5 crop ratio. My question is......Is it the same when using the DX lenses or is a DX24mm actually 24mm?

24mm is always 24mm, FX or DX. The sensor size does not change the focal length, only the angle of view.
A DX 24mm is 24mm, but on a DX sensor a 24 mm lens (FX or DX) will have an equivalent angle of view of 36mm.

ballsafire Loc: Lafayette, Louisiana

A DX24mm is actually 24mm!!

Abo

There's a few ambiguities with your post TM.

Your D750 is a "full frame" camera, in Nikonese; "FX".

The images projected by your DX lenses will not
entirely cover the sensor of the D750.

You really need FX lenses to appreciate
the ability of your excellent D750.

Anyway, I believe the focal length printed on all Nikon lenses
whether DX or FX are the actual focal lengths.

So your 24mm DX lenses focal length is actually 24mm.
Having said that, the angle of view will be narrower than
a 24mm FX lens on an FX camera because the DX sensor
is smaller and captures a smaller area.

For a detailed explanation go here:
https://www.nikonusa.com/en/learn-and-explore/a/products-and-innovation/the-dx-and-fx-formats.html

TMurphy71

I have pro grade lenses for my full frame camera. I would not waste my time putting my DX lenses on that body. My question is specific for the DX lenses on my crop bodies. If I put my 24mm DX lens on my crop body is it the equivalent of 24mm or 36mm?

dandi Loc: near Seattle, WA

TMurphy71 wrote:

I have pro grade lenses for my full frame camera. I would not waste my time putting my DX lenses on that body. My question is specific for the DX lenses on my crop bodies. If I put my 24mm DX lens on my crop body is it the equivalent of 24mm or 36mm?

I didn't know that Nikon makes 24mm DX lens.

Mac Loc: Pittsburgh, Philadelphia now Hernando Co. Fl.

TMurphy71 wrote:

I have pro grade lenses for my full frame camera. I would not waste my time putting my DX lenses on that body. My question is specific for the DX lenses on my crop bodies. If I put my 24mm DX lens on my crop body is it the equivalent of 24mm or 36mm?

It is the angle of view equivalent to 36mm.

CHG_CANON Loc: the Windy City

Pages 110-112 of your D750 manual would be a good place to consult about the use of DX lenses on this FX body. Page 118 gives you the maximum pixel resolution 3936x2624 = 10MP, a pretty significant step down from your 6016x4016 = 24MP full frame sensor. A step down too from your overlapping 24MP DX bodies.

Mac Loc: Pittsburgh, Philadelphia now Hernando Co. Fl.

CHG_CANON wrote:

Pages 110-112 of your D750 manual would be a good place to consult about the use of DX lenses on this FX body. Page 118 gives you the maximum pixel resolution 3936x2624 = 10MP, a pretty significant step down from your 6016x4016 = 24MP full frame sensor.

He's asking if a 24mm DX lens will give him an equivalent angle of view of 24mm or 36mm on a DX sensor.

Strodav Loc: Houston, Tx

You might want to watch the following video. Sensor size not only affects crop factor (multiply the focal length by the crop factor), but also effective aperture (divide the FF aperture by the crop factor) affecting background blur then need to adjust the ISO for the same exposure (FF ISO divided by the crop factor squared).

https://www.youtube.com/watch?v=hi_CkZ0sGAw

ballsafire Loc: Lafayette, Louisiana

Mac wrote:

It is the angle of view equivalent to 36mm.

Longshadow Loc: Audubon, PA, United States

Mac wrote:

It is the angle of view equivalent to 36mm.

It looks like a 36mm when used on a crop sensor.

GoofyNewfie Loc: Kansas City

Strodav wrote:

You might want to watch the following video. Sensor size not only affects crop factor (multiply the focal length by the crop factor), but also effective aperture (divide the FF aperture by the crop factor) affecting background blur then need to adjust the ISO for the same exposure (FF ISO divided by the crop factor squared).

https://www.youtube.com/watch?v=hi_CkZ0sGAw

One caveat:
(A lot of people are misled by the video.)
You do not need to adjust for exposure if you’re using a different sized sensor.
He covers that about:2 minutes and 16 minutes in.
His application compensates for using a specific aperture for getting equivalent depth of field, then you would need to adjust either the ISO and/or shutter setting for proper exposure.

Anyone who uses/used a hand-held light meter will tell you that there are no compensation/adjustment markings for different format cameras.

Longshadow Loc: Audubon, PA, United States

GoofyNewfie wrote:

You do not need to adjust for exposure!
He covers that about 16 minutes in.

The lens opening is the lens opening.
It lets the same amount of light through regardless of what it is mounted on.

Strodav Loc: Houston, Tx

GoofyNewfie wrote:

One caveat: br (A lot of people are misled by the ... (show quote)

The whole idea of the video is to show how to get EQUIVALENT images between FF sensor cameras and non-FF sensor cameras. Let's say you take portrait with a 50mm lens on a FF camera at 1/500 sec, f4 and ISO 400. If I want an equivalent image with a Nikon DX (aps-c) camera, what lens and settings would I need to use? Answer: 50mm / 1.5 = 33mm (so use a 35mm lens) at f4/1.5 = f/2.7 (so use f/2.8) and ISO 400/1.5^2 = 177 (since you are opening the aperture to maintain blur you need to reduce ISO to get the same exposure) and leave the shutter at 1/500 sec. Please help me understand why this is confusing?