ok, so what's with this vignetting crap?

Slipperman

Senior Member
image size = L
image format = FX
NIKKOR 18-140

had to crop everything from something like this..

MillPond_056a.jpg

to this..

MillPond_056_057_058_HDR_deep1_crop.jpg

i do have an FX size sensor in my camera so why is the inside of the lens showing up?? hate to think i'll have to crop every damn picture.
 

sonicbuffalo_RIP

Senior Member
If you use a DX lens on a Full Frame body, which si what you've done here....you will have the vignetting. You need to buy or get your hands on a Full frame lens. Try your 50 mm lens. It may very well be a FX lens. My 50/f1.8 was a FF.

And what Sparky said....set your camera to crop mode....that will help you too.
 
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480sparky

Senior Member
Your lens is only a DX lens and is not designed to project an image large enough to cover your FX sensor.

Change your FX camera to shoot DX format when a DX lens is attached.
 

Moab Man

Senior Member
The 18-140mm is a DX lens. If you're shooting on an FX sensor the sensor is wider and you will pick up the inside of the lens. However, I would have expected the camera to go into DX mode.
 
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J-see

Senior Member
The 18-140mm is a DX lens. If your shooting on FX sensor the sensor is wider and you will pick up the inside of the lens. However, I would have expected the camera to go into DX mode.

You have to enable DX mode on the D750. His lens is only usable around 30something on the FX.
 

Horoscope Fish

Senior Member
Has anyone mentioned the Nikon 18-140mm is a DX lens, and that you're shooting with an FX body?

And that too keep that from happening in the future you need to put your camera body in "DX Crop Mode"?
...
 

Slipperman

Senior Member
ok, another question. this morning i saw that the format was set to DX crop and not knowing any better changed it to FX (thinking well, it's an FX format camera). this resulted in the vignetting crap. however, i took a bunch of pictures yesterday with the format already and unknowingly set to DX crop and there was no vignetting so that solves that issue. however, with my 5100, i used a large image size which resulted in images with a size of 4928x3264. using the DX crop yesterday, i also set the size to large but those images came out with a size of 3968x2640. so why the discrepancy in size? the crop seems to create smaller images than a DX camera would.
 

480sparky

Senior Member
ok, another question. this morning i saw that the format was set to DX crop and not knowing any better changed it to FX (thinking well, it's an FX format camera). this resulted in the vignetting crap. however, i took a bunch of pictures yesterday with the format already and unknowingly set to DX crop and there was no vignetting so that solves that issue. however, with my 5100, i used a large image size which resulted in images with a size of 4928x3264. using the DX crop yesterday, i also set the size to large but those images came out with a size of 3968x2640. so why the discrepancy in size? the crop seems to create smaller images than a DX camera would.

It's a function of how many pixels are on the sensor to begin with. There are DX-format cameras with more pixels than some FX sensors.

FX ≠ a set, given number of pixels, any more than DX does. The DX D7100 and FX D600 are both 24mp. Of course the D600, in DX mode, will have fewer pixels.
 

BackdoorArts

Senior Member
A good chunk of what you are experiencing is explained here http://nikonites.com/tutorials/20377-fx-vs-dx-uncomplicating-math.html#axzz3Noj172wV

You've got a great Full Frame camera, but your lenses are a bunch of DX glass (the 50mm is your only full framed lens). If you didn't realize the implications of this before you laid down the money for your D750 then your lack of legwork (and that's what it has to be because this is talked about all the time) led you to buy a camera that can't effectively use most of your lenses. Yes, there's a DX mode, but all that does is remove 55% of your pixels, turning your wonderful 24MP camera into a $2200 11MP DX camera. It does not take your DX lens and magically expand it to cover the FX sensor, it takes your FX sensor and tells the outside edges to take a break while the center does all the work.

Time for new glass. Until then, stick the 50mm on there and shoot.
 

Slipperman

Senior Member
A good chunk of what you are experiencing is explained here http://nikonites.com/tutorials/20377-fx-vs-dx-uncomplicating-math.html#axzz3Noj172wV

You've got a great Full Frame camera, but your lenses are a bunch of DX glass (the 50mm is your only full framed lens). If you didn't realize the implications of this before you laid down the money for your D750 then your lack of legwork (and that's what it has to be because this is talked about all the time) led you to buy a camera that can't effectively use most of your lenses. Yes, there's a DX mode, but all that does is remove 55% of your pixels, turning your wonderful 24MP camera into a $2200 11MP DX camera. It does not take your DX lens and magically expand it to cover the FX sensor, it takes your FX sensor and tells the outside edges to take a break while the center does all the work.

Time for new glass. Until then, stick the 50mm on there and shoot.
hmm, done ridiculing now? like i'm not gonna buy the 750 because my current lenses are DX format? and i didn't buy them because they were DX, i bought them because i liked the focal length or the macro capability. they just happened to be DX. and stop with the legwork stuff too. i don't read every thread on here nor do i want to. right now i'm more interested in learning my new camera than i am in worrying about the lenses. just came across a situation that i'll bet is pretty normal for people who just made a huge upgrade in equipment.
 

J-see

Senior Member
hmm, done ridiculing now? like i'm not gonna buy the 750 because my current lenses are DX format? and i didn't buy them because they were DX, i bought them because i liked the focal length or the macro capability. they just happened to be DX. and stop with the legwork stuff too. i don't read every thread on here nor do i want to. right now i'm more interested in learning my new camera than i am in worrying about the lenses. just came across a situation that i'll bet is pretty normal for people who just made a huge upgrade in equipment.

If you go from DX to FX, this problem is one that many face. I luckily bought most of my lenses with FX already in mind but some I had to upgrade later on. I tried to use some DX lenses for a while but DX mode on the D750 simply does not satisfy long and shooting in FX mode while losing the lower end of the zoom lens wasn't a great option either.

To fully use the D750 you'll be forced to go FX with all lenses but since that costs money, it's not something we all can instantly replace. Until then, make the best of what you got.
 
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Slipperman

Senior Member
If you go from DX to FX, this problem is one that many face. I luckily bought most of my lenses with FX already in mind but some I had to upgrade later on. I tried to use some DX lenses for a while but DX mode on the D750 simply does not satisfy long and losing the lower end of the zoom lens wasn't a great option either.

To fully use the D750 you'll be forced to go FX with all lenses but since that costs money, it's not something we all can instantly replace. Until then, make the best of what you got.
thank you.. at least some people can be tactful on here.
 

Kultfunk

Senior Member
thank you.. at least some people can be tactful on here.

Upgrade-wise: since the D750 has a built in AF-motor means that you're not restricted to the newer AF-S lenses... you can also look around (2nd hand) for older AF-D & AF screw driven lenses of the film era... some go them are (still) pretty good performers on a dslr !
 

hark

Administrator
Staff member
Super Mod
Contributor
i bought them because i liked the focal length or the macro capability. they just happened to be DX.

Your Tamron 70-300mm looks like it is an FX lens so you shouldn't experience any problem with it. At some point, please consider getting a different wide-normal zoom lens. Your three 18-xx zooms are all specifically DX lenses.

18mm on FX gives a much different field of view than 18mm on DX. 18mm on FX captures a wider area because 18mm on DX is equivalent to 27mm on FX. There are some decent 24-xxmm FX zooms available as well as some 17-xxmm or 18-xxmm FX zooms. If you liked 18mm on DX, you might REALLY love 24-xxmm or 18-xxmm zooms specifically made for FX. ;)
 
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