Rokinon 14mm f/2.8 IF ED UMC Super Wide Angle Lens

timlatham

New member
I recently purchased my D3300 and a Rokinon 14mm f/2.8 IF ED UMC Super Wide Angle Lens w/ Built-in AE Chip for Nikon to take on vacation.
[h=1][/h]The photos I took with the Wide Angle Lens look the same as the same scenes taken with the normal lens that came with the camera. I cannot see any
wide angle effects. Is the camera not compatible with this lens? I took the camera to my local dealer and he seems to think that the lens is functioning ok but that there may be something in the body that is not allowing the wide angle effect I have hoped for. Can anyone offer any insight into this?

Thanks,
Tim
 

timlatham

New member
Thanks for the quick reply. The lens that came with the camera is a Nikkor 18-55 mm zoom lens. I took over 2000 photos on the trip so I will look through them and send a few.
 

Blacktop

Senior Member
I recently purchased my D3300 and a Rokinon 14mm f/2.8 IF ED UMC Super Wide Angle Lens w/ Built-in AE Chip for Nikon to take on vacation.
The photos I took with the Wide Angle Lens look the same as the same scenes taken with the normal lens that came with the camera. I cannot see any
wide angle effects.
Is the camera not compatible with this lens? I took the camera to my local dealer and he seems to think that the lens is functioning ok but that there may be something in the body that is not allowing the wide angle effect I have hoped for. Can anyone offer any insight into this?

Thanks,
Tim

I don't quite understand. Are you saying that you took a shot with your 14mm Rokinon, then you took the same shot from the same distance with your 18-55mm and the 18-55mm looks just as wide as the 14mm?
 

Bill16

Senior Member
I think I understand! The lens you have is super wide but only on FX Nikon's! It won't have the same effects your looking for on your Nikon only on full frame Nikon's!
 

J-see

Senior Member
It's indeed an FX lens that will have a field of view of about a 20mm on your D3300. Which is why there's that little difference with the 18-55mm.
 

J-see

Senior Member
But a 14mm lens, FX or DX, should still have a wider FOV than an 18mm.

The wider part doesn't hit the sensor. Since the sensor is smaller, it only gets the center part of the image the lens casts. The full image cast by the lens on the sensor is about 35mm wide but the DX only grabs the inner 24mm which results into a narrower field of view.

The 18mm is a DX lens which casts the full 18mm FoV on the sensor.
 
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Bill16

Senior Member
I don't know. I was just saying that it's only super wide on FX.I never bothered to try mine on a DX, when you can use a FX! Also for a DX I would just get a 11-16 lens if I used a wide angle on my D300! :)

But a 14mm lens, FX or DX, should still have a wider FOV than an 18mm.
 

480sparky

Senior Member
The wider part doesn't hit the sensor. Since the sensor is smaller, it only gets the center part of the image the lens casts. The full image cast by the lens on the sensor is about 35mm wide but the DX only grabs the inner 24mm which results into a narrower field of view.

The 18mm is a DX lens which casts the full 18mm FoV on the sensor.


I guess we need to review focal length and how it relates to sensor sizes again. Whether the lenses are FX or DX is not relevant since you're using a DX sensor. They both will cover the area of a DX sensor.

A 14mm, whether it's designed for DX or FX, will have a wider FOV on a DX sensor than an 18mm, whether or not the 18mm is DX or FX. 14mm is 14mm, and 18mm is 18mm. Period. There's no way a change in sensor size modifies those.

You can take 14mm DX and an 18mm FX lenses, and put them on a DX camera and the 14mm will have a wider FOV.
 

J-see

Senior Member
I guess we need to review focal length and how it relates to sensor sizes again. Whether the lenses are FX or DX is not relevant since you're using a DX sensor. They both will cover the area of a DX sensor.

A 14mm, whether it's designed for DX or FX, will have a wider FOV on a DX sensor than an 18mm, whether or not the 18mm is DX or FX. 14mm is 14mm, and 18mm is 18mm. Period. There's no way a change in sensor size modifies those.

You can take 14mm DX and an 18mm FX lenses, and put them on a DX camera and the 14mm will have a wider FOV.

Then why does my Tamron 600mm shot have a wider FoV on my D810 than it does on my D3300? Same thing at work as with the 14mm FX vs 18mm DX.

It's not the FoV of a 14 vs 18 but of a 20-21 vs 18mm. The 18mm is a DX lens which will cast the FoV of an 18mm on the sensor. The same is not true when you attach an FX lens to a DX.
 
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480sparky

Senior Member
Then why does my Tamron 600mm shot have a wider FoV on my D810 than it does on my D3300? Same thing at work as with the 14mm FX vs 18mm DX.

Because one is an FX sensor and the other is a DX sensor. We're talking about JUST the DX sensor the OP has. And once again, it's NOT RELEVANT whether a lens is designed for DX or FX. Put two lenses on a DX body and the shorter focal length WILL have a wider FOV. It's that simple.

It's not the FoV of a 14 vs 18 but of a 20-21 vs 18mm.

Where did you magically get 20-21mm? Who introduced a 20 or 21mm lens into the mix?
 

J-see

Senior Member
Because one is an FX sensor and the other is a DX sensor. We're talking about JUST the DX sensor the OP has. And once again, it's NOT RELEVANT whether a lens is designed for DX or FX. Put two lenses on a DX body and the shorter focal length WILL have a wider FOV. It's that simple.



Where did you magically get 20-21mm? Who introduced a 20 or 21mm lens into the mix?

An FX 14 mm on a DX cam is the equivalent of a 20-21mm DX lens and will have the same FoV.
 

480sparky

Senior Member
An FX 14 mm on a DX cam is the equivalent of a 20-21mm DX lens and will have the same FoV.


Incorrect.

Focal length is immutable. It has nothing to do with field of fiew. A 14mm lens is 14mm. A 50mm lens is 50mm. A 200mm lens is 200mm. That does not change by putting a different sensor behind it. A different sensor cannot magically change a lens's focal length.


What DOES change is the FOV, based on the focal length IN CONJUNCTION WITH the size of the sensor. But a 14mm lens does not 'become' a 21mm just because it's on a DX-format camera. Never has, and never will.
 

J-see

Senior Member
Incorrect.

Focal length is immutable. It has nothing to do with field of fiew. A 14mm lens is 14mm. A 50mm lens is 50mm. A 200mm lens is 200mm. That does not change by putting a different sensor behind it. A different sensor cannot magically change a lens's focal length.

Let's try it this way.

I'm shooting my 50mm on the FX. I give it to you and you take the exact same shot with a DX.

Now we compare images. Has you image a narrower field of view than mine? We took the same shot at the same distance.

Btw, when I say equivalent I was talking about the FoV. I didn't imply the lens gets "longer". The 14mm FX will have about the same FoV on the DX as a 20-21mm DX lens.
 
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480sparky

Senior Member
Let's try it this way.

I'm shooting my 50mm on the FX. I give it to you and you take the exact same shot with a DX.

Now we compare images. Has you image a narrower field of view than mine? We took the same shot at the same distance.

Btw, when I say equivalent I was talking about the FoV. I didn't imply the lens gets "longer".



First, let's kick the FX sensor idea out. The OP does not have an FX sensor, so comparing sensor size is totally irrational.

But try this:

Put a 50mm FX lens and a 50mm DX lens on a DX camera. You'll get the exact same image.
 

J-see

Senior Member
First, let's kick the FX sensor idea out. The OP does not have an FX sensor, so comparing sensor size is totally irrational.

But try this:

Put a 50mm FX lens and a 50mm DX lens on a DX camera. You'll get the exact same image.

No you don't since the 50mm DX will cast a "true" 50mm image on the sensor. That's why a 50mm DX on an FX cam doesn't fill the frame.
 

J-see

Senior Member
I gave away my D3300 today else I'd show you the difference.

A DX lens is not identical to an FX lens and although both can be used on a DX cam, only the DX lenses will have the FoV of the specific focal length that lens has. The FX lens has the FoV of that lens but since only a portion of the image reaches the sensor, that FoV gets narrower.
 

480sparky

Senior Member
No you don't since the 50mm DX will cast a "true" 50mm image on the sensor. That's why a 50mm DX on an FX cam doesn't fill the frame.

Yes, you will. I will state this again and again. 50mm is 50mm. It is a property of the optics of the lens. It has ZIP to do with sensors. And I will state this again and again (simply because it's true): a 50mm FX lens and a 50mm DX lens will produce the same image when used on a DX sensor. End of story.

http://nikonites.com/d750/29680-dx-lens-fx-camera.html#post434074

I just gotta ask.... do you know the difference between an FX and DX lens? What makes a lens DX and what makes a lens FX?
 

J-see

Senior Member
Yes, you will. I will state this again and again. 50mm is 50mm. It is a property of the optics of the lens. It has ZIP to do with sensors. And I will state this again and again (simply because it's true): a 50mm FX lens and a 50mm DX lens will produce the same image when used on a DX sensor. End of story.

http://nikonites.com/d750/29680-dx-lens-fx-camera.html#post434074

I just gotta ask.... do you know the difference between an FX and DX lens? What makes a lens DX and what makes a lens FX?

Yep since I had both types and shot both types on both formats and I'm certain that my 14mm FX doesn't have the same FoV on my DX than the 14mm length of my 10-24mm DX.

But if you don't agree, that's cool.

I'll just wait until I can say; told you so. ;)

I got some post here where I shot the 200mm macro (FX lens) on both cams and it should show clearly what happens. If only I could find it.
 
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