FX Vs DX lens
Apr 20, 2012 18:13:02 #
I would appreciate an explanation of the following: When you use an FX lens on a DX camera body (Nikon for example) the crop factor of 1.5 comes into play. Thus an FX 50mm lens will give you the perspective of a 75 mm lens. Magnification stays the same and you do not get an increase in the magnification. The FX lens on a full frame camera body will naturally give you the 50mm focal length as well as the perspective of the 50mm lens. The question I have is when using a 50mm DX lens on a DX camera body (which lens is made specifically for the smaller sensor in the DX body) why do you get the perspective of a 75mm lens???? Example.The Tokina 11-16 DX lens tells you in its literature that it is the equivilent to a 17-24 lens in a 35mm. Why is it not a true 11-16 on a DX body in similar fashion to and FX lens on a full frame body???
Apr 20, 2012 18:17:59 #
Read this Frequently asked Question & Answer pertaining to your question.
FAQ: Sensor Sizes Chart & Comparative Format Views
http://www.uglyhedgehog.com/t-26503-1.html
FAQ: Sensor Sizes Chart & Comparative Format Views
http://www.uglyhedgehog.com/t-26503-1.html
Apr 20, 2012 18:20:02 #
There was a recent drawn out discussion on this topic. Might I suggest you use the search feature.
Edit: Looks like Nikonian sent it to you.
Edit: Looks like Nikonian sent it to you.
Apr 20, 2012 19:03:55 #
Just one little thing to help your understanding: focal length (crop/no crop, no matter) does not affect perspective. The only thing that does is the distance between the subject and the camera. You can prove this by taking a shot with a wide angle and same shot with a long lens. Crop the section out of the wide angle lens image that matches the long lens image. Perfect match-they will be identical.
Apr 20, 2012 19:09:09 #
Apr 20, 2012 20:49:04 #
ward5311 wrote:
Fail! FX lens + 1.5 TC = DX lens
This makes no sense. 1.5x crop factor has nothing to do with tele-converters. It is a function of sensor size.
This diagram shows that an FX sensor captures 1.5x more field-of-view than a DX sensor.
Sensors - Full Frame (FX) vs APS-C (DX) Field-of-View Comparison
Apr 20, 2012 21:06:40 #
Wabbit
Loc: Arizona Desert
wgold13 wrote:
I would appreciate an explanation of the following... (show quote)
It's not the DX or FX lens that changes the perspective it's the sensor
Apr 20, 2012 21:07:42 #
ward5311 wrote:
FX lens + 1.5 TC = DX lens
Not quite accurate. There is no 1.5 TC, but there is a 1.4. A 200mm on the DX platform gives a FOV of 300mm. The 200 mm on a DX with the 1.4 TC = 280.
Apr 20, 2012 21:31:29 #
CaptainC wrote:
Not quite accurate. There is no 1.5 TC, but there is a 1.4. A 200mm on the DX platform gives a FOV of 300mm. The 200 mm on a DX with the 1.4 TC = 280.
ward5311 wrote:
FX lens + 1.5 TC = DX lens
Not quite accurate. There is no 1.5 TC, but there is a 1.4. A 200mm on the DX platform gives a FOV of 300mm. The 200 mm on a DX with the 1.4 TC = 280.
I know that...and my point is this....if you look through the viewfinder of a DX camera and DX lens you will see exactly the same image on the same scale as you would if looking through the viewfinder of an FX camera with FX lens with a 1.5 TC (for Nikon if they made one but they only make 1.4 and 2X). Exactly the same image, size, and scale. And Nikonian I only used a TC to make a point. I know a TC has nothing to do with a crop sensor. That's a little condescending.
Apr 20, 2012 21:42:05 #
Wabbit wrote:
quote=wgold13 I would appreciate an explanation o... (show quote)
Nope- ONLY DISTANCE changes perspective. Nothing else.
Apr 20, 2012 21:55:22 #
ward5311 wrote:
If you want to share your knowledge, make sure it is correct. If you have to explain your errors, as you did to CaptainC and me, you are only confusing less experienced photographers. And you run the risk of earning a reputation for presenting mis-leading information on UHH. I only used a TC to make a point. I know a TC has nothing to do with a crop sensor. That's a little condescending.
Apr 20, 2012 22:00:52 #
Wabbit wrote:
The difference between FX and DX is field-of-view. See diagram above. As CaptainC stated, only distance changes perspective.It's not the DX or FX lens that changes the perspective it's the sensor
Apr 20, 2012 22:08:40 #
Nikonian72 wrote:
ward5311 wrote:
If you want to share your knowledge, make sure it is correct. If you have to explain your errors, as you did to CaptainC and me, you are only confusing less experienced photographers. And you run the risk of earning a reputation for presenting mis-leading information on UHH. I only used a TC to make a point. I know a TC has nothing to do with a crop sensor. That's a little condescending.
It would never be my intent to mislead anyone. I don't claim to be an expert. I was addressing my point to the OP to grasp the concept. You are more informed on many things on photography no doubt, but I do know the difference between FX and DX and was trying to simplify it for the OP. I might have not made my point as well as I should but then again I didn't think I was making a very fine point to you as I did in my follow up. Sometimes people don't understand things that are said because they don't understand or wallow in the details. I was trying to help the OP. Peace.
Apr 20, 2012 22:31:23 #
Wabbit
Loc: Arizona Desert
CaptainC wrote:
quote=Wabbit quote=wgold13 I would appreciate an... (show quote)
You're right, I meant angle of view.
Apr 20, 2012 22:46:34 #
ward5311 wrote:
Sometimes people shouldn't post because they do not understand the details.Sometimes people don't understand things that are said because they don't understand or wallow in the details.
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