comparable FoV: I'm upgrading my setup from a crop sensor (nikon d3200) to a full frame (sony a7 rII). I've only ever had the crop and was wondering how I could figure out the...

bmike101 Loc: Gainesville, Florida

I'm upgrading my setup from a crop sensor (nikon d3200) to a full frame (sony a7 rII). I've only ever had the crop and was wondering how I could figure out the comparable FoV of the two?

rdubreuil Loc: Dummer, NH USA

bmike101 wrote:

I'm upgrading my setup from a crop sensor (nikon d3200) to a full frame (sony a7 rII). I've only ever had the crop and was wondering how I could figure out the comparable FoV of the two?

Your field of view is based on the crop of the sensor in what ever camera you are using in comparison to FF 35mm equivalent. In other words your field of view on FF is as stated on the lens so a 24-70 is 24-70. The crop only comes into play on the crop sensors, Nikon 1.5, Canon 1.6 which not only applies to focal length (60mm becomes 90mm on Nikon) but, it also applies to f stop of the lens. To know the equivalent on a crop body you must also multiply the f stop by the crop factor, so an f/2.8 lens on full frame would act like an f/4.2 on a crop body when one is considering the loss of light and changes to depth of field. That's also why a FF wide angle lens is not the same as a DX wide angle lens, based on the circle of projection onto the sensor.

CHG_CANON Loc: the Windy City

This will probably help.

http://www.bhphotovideo.com/explora/photography/tips-and-solutions/understanding-crop-factor

Pegasus Loc: Texas Gulf Coast

rdubreuil wrote:

Your field of view is based on the crop of the sen... (show quote)

This all unbelievably incorrect. The focal length and f-number of a lens do not change.

rdubreuil Loc: Dummer, NH USA

Pegasus wrote:

This all unbelievably incorrect. The focal length and f-number of a lens do not change.

Based on the crop factor the perceived field of view certainly does change. Not once did I mention a change in focal length, there is no change in magnification of the image.

https://www.youtube.com/watch?v=f5zN6NVx-hY

CHG_CANON Loc: the Windy City

rdubreuil wrote:

Your field of view is based on the crop of the sen... (show quote)

Second - This all unbelievably incorrect. The focal length and f-number of a lens do not change.

rdubreuil Loc: Dummer, NH USA

CHG_CANON wrote:

Second - This all unbelievably incorrect. The focal length and f-number of a lens do not change.

Follow the link. We're talking perceived field of view not that a lenses focal length changes. A 50mm is a 50mm all day long, add a crop factor and compare images and an image on a crop sensor would appear as though it were shot with a 75 or 80 depending on the crop factor. Now factor in circle of projection of a lens (FF vs. DX) as well as the effect on depth of field and in turn it's effect on bokeh.

R.G. Loc: Scotland

bmike101 wrote:

I'm upgrading my setup from a crop sensor (nikon d3200) to a full frame (sony a7 rII). I've only ever had the crop and was wondering how I could figure out the comparable FoV of the two?

Going from crop sensor to full frame, to calculate what focal length gives the same field of view you multiply the focal length of the DX lens by 1.5. For the same FOV -

16mm DX = 24mm FF.

80mm DX = 120mm FF.

200mm DX = 30mm FF etc.

jerryc41 Loc: Catskill Mts of NY

bmike101 wrote:

I'm upgrading my setup from a crop sensor (nikon d3200) to a full frame (sony a7 rII). I've only ever had the crop and was wondering how I could figure out the comparable FoV of the two?

CG Canon gave you a good link. This one might help, too. The crop factor for Nikon DX bodies is 1.5, so multiply 100mm (FF) by 1.5, and you get 150mm on the Nikon. Or divide the 150mm by 1.5, and you get 100mm on the Sony relative to the Nikon. In short, a FF camera will give you a wider field of view for any given lens over a crop sensor.

https://photographylife.com/sensor-crop-factors-and-equivalence

jerryc41 Loc: Catskill Mts of NY

Pegasus wrote:

This all unbelievably incorrect. The focal length and f-number of a lens do not change.

Actually, it is perfectly correct. Although focal length and aperture do not change, the field of view does. From B&H -

"...the images seen through a lens of any particular focal length had a different field of view than that of the same lens on a 35mm film camera. Suddenly, a 50mm lens no longer had a “normal” field of view; it was a bit more of a telephoto."

jerryc41 Loc: Catskill Mts of NY

CHG_CANON wrote:

Second - This all unbelievably incorrect. The focal length and f-number of a lens do not change.

Actually, it is perfectly correct. Although focal length and aperture do not change, the field of view does. From B&H -

"...the images seen through a lens of any particular focal length had a different field of view than that of the same lens on a 35mm film camera. Suddenly, a 50mm lens no longer had a “normal” field of view; it was a bit more of a telephoto."

I think we all know what we're talking about, but we're getting hung up on terminology. Just look through the viewfinder of a crop body and then put the same lens on a full frame. The difference is obvious, regardless what terminology you use.

These lens simulators show that.

http://imaging.nikon.com/lineup/lens/simulator/
http://www.dpreview.com/galleries/9059751105/photos/2518330/olympus-zuiko-lens-field-of-view-comparison

Linary Loc: UK

bmike101 wrote:

I'm upgrading my setup from a crop sensor (nikon d3200) to a full frame (sony a7 rII). I've only ever had the crop and was wondering how I could figure out the comparable FoV of the two?

A field of view calculator which will give you the angular or dimensional field of view and will give you the answers you want is at:
http://www.tawbaware.com/maxlyons/calc.htm

Scroll down through Depth of Field and Parallax calculators and then you have two simple but accurate FoV calculators.

rdubreuil Loc: Dummer, NH USA

jerryc41 wrote:

Actually, it is perfectly correct. Although focal... (show quote)

Thanks Jerry, I didn't think I was talking out my ass. Maybe it's how I worded it but, the concept is the same.

Pegasus Loc: Texas Gulf Coast

rdubreuil wrote:

Thanks Jerry, I didn't think I was talking out my ass. Maybe it's how I worded it but, the concept is the same.

Unfortunatley for you Jerry is not the arbiter of truth and apart from being very quick to post countless links as supposed answers to questions, he eschew responding to the question or even understanding the sites to which he so feverishly links.

A focal length for a lens is a focal length. Unless you physically do something to the lens itself, it doe not change its focal length. In a lens the focal length is the distance between the point of convergence and the plane of the sensor or film. A zoom lens will change that distance physically. The F-number of the lens is the ratio of the focal length to the diameter of the objective lens. For a given focal length you have an F-number. It does not change because of the size of the sensor. A 50mm f/1.8 lens is a 50mm f/1.8 lens regardless of the sensor size.

I can somewhat forgive you for conflating the change in FoV between a crop sensor and a FF sensor because a lot of people equate the change in FoV to a magnifying factor. But the F-number does NOT change because of the sensor and that is talking out of your ass.

rdubreuil Loc: Dummer, NH USA

Pegasus wrote:

Unfortunatley for you Jerry is not the arbiter of ... (show quote)

I'm in complete agreement, it's perceived field of view (no physical change to focal length & no magnification change) however it has an effect on depth of field. What changes depth of field? F stop right? So if no settings were to change except the camera body with the same lens you'd see the difference in the depth of field or bokeh if you will, ergo; would that not indicate the f stop was also affected? The sensor plays a role in there too, pixel pitch, pixel size and density along with it's ability to gather light. Then there's the issue of DX vs. FX lenses and how they affect things, focal length not withstanding and how the glass elements interact in the system for field of view. I wasn't purporting to be an expert, only offering up a response to the OP based in essence saying the exact same thing. Most of which for the OP is a moot point as he's going from DX to FX there's no crop factor to contend with, if he were transitioning down to or adding DX to an existing FX kit the original question would make more sense.