Nikkor AF DX 10.5mm f/2.8 ED Fisheye Lense

[jo3pit]

Originally Posted by Andy Ho It is a full frame fish eye to replace the 16mm for use on Nikon DX digital cameras so that you get a full fish eye effect. Andy Ho

gee, it's making me more excited...

[scanman]

Hi

What happen when u fix the 10.5 DX lens on normal SLR?
wat the effect?

[Andy Ho]

Originally Posted by scanman Hi What happen when u fix the 10.5 DX lens on normal SLR? wat the effect?

You get vignetting on your pictures (circular shadows on the edge) for the image circle projected by this lens is smaller than that from of a normal lens. This is to cater to DSLR users who does not have the ability to achieve full frame fish eye due to the 1.5 times manification factor caused by the smaller sensor as compared to film.

Andy Ho

[VincentLin]

Originally Posted by Andy Ho You get vignetting on your pictures (circular shadows on the edge) for the image circle projected by this lens is smaller than that from of a normal lens. This is to cater to DSLR users who does not have the ability to achieve full frame fish eye due to the 1.5 times manification factor caused by the smaller sensor as compared to film. Andy Ho

Vignetting is, of course, quite irritating. But the hilarious images you see in the viewfinder... remember that bunch of adverts with a dog whose nose is really inflated looking?

Try to imagine it being much more distorted.

[Andy Ho]

Originally Posted by VincentLin Vignetting is, of course, quite irritating. But the hilarious images you see in the viewfinder... remember that bunch of adverts with a dog whose nose is really inflated looking? Try to imagine it being much more distorted.

[scanman]

one question..
if i m using a non digital nikon lens let say 50mm f2.0
if it fitted on D100 it will become 75mm rt? how abt the F stop?
will it change too?

thanks

[VincentLin]

Originally Posted by scanman one question.. if i m using a non digital nikon lens let say 50mm f2.0 if it fitted on D100 it will become 75mm rt? how abt the F stop? will it change too? thanks

ur F wouldn't change. the imaging sensor just does a crop - that's why u get a magnification factor.

experts... please elaborate. I'm no digital junkie.

[scanman]

ic ic ... i m worried that it might lose out on the f stop.

BTW... a digital camera when using a conventional flash gun say SB 28 wont have the TTL function rt?

[johnyu]

Originally Posted by scanman one question.. if i m using a non digital nikon lens let say 50mm f2.0 if it fitted on D100 it will become 75mm rt? how abt the F stop? will it change too? thanks

While the F-stop stays the same, the effective DOF on DSLR for the same FOV as on 135 (35mm) format is deeper. That means it's harder to get nice out of focus background...

(Note: The effective DOF is affected by the cropping of the smaller CCD size and that we move further away from the subject to maintain the same FOV. http://dfleming.ameranet.com/dof_dslr.html has a good article on it. http://www.photo.net/learn/optics/dofdigital/ has a more technical, but somewhat confusing, article.)

[johnyu]

Originally Posted by scanman ic ic ... i m worried that it might lose out on the f stop. BTW... a digital camera when using a conventional flash gun say SB 28 wont have the TTL function rt?

Tranditional TTL flash won't work on DSLR. (Manual mode works though.)

Reason: The TTL flash metering is performed by measuring the light reflected from the film surface *when* the shutter curtain is opened. The body cuts off the flash when its meter says enough light is collected. CCD got some nastily reflection property that rules out this approach.

Newer "DX" flashes perform "psuedo TTL": they use pre-flashes to meter and calculate the required outuput *before* the shutter curtain is opened. (Yes, this is similar to the auto fill-in monitor pre-flash.) The downside of doing this is if it is a fast-moving subject, the reading can be wrong.

[scanman]

ic ic...

so those old Metz flash gun cant be used on DSLR even if i change the adapter. rt?

[MatthewSL]

excellent wideview lens! got mine last weekend from john 3:16.

[bearycute]

Originally Posted by scanman ic ic... so those old Metz flash gun cant be used on DSLR even if i change the adapter. rt?

Not all DSLR cant ttl... S2Pro can

[johnyu]

Originally Posted by bearycute Not all DSLR cant ttl... S2Pro can

Yes, bearycute is right! Fuji S2Pro can do TTL with "classic" non-DX flashes, even with AIS lenses. Amazing! (How do they do it? )

[ckiang]

Originally Posted by johnyu Yes, bearycute is right! Fuji S2Pro can do TTL with "classic" non-DX flashes, even with AIS lenses. Amazing! (How do they do it? )

Yes it can. Dunno how far it's true, but I heard from some S2 Pro users that the TTL on the S2 Pro isn't accurate. And read somewhere the S2 Pro TTL works only up to 400, dunno what will happen at ISO 800 though.

Then again, D-TTL on D100 is also very erratic...

Regards
CK

[Larry]

Originally Posted by scanman Hi What happen when u fix the 10.5 DX lens on normal SLR? wat the effect?

actually, at the CS-Nikon outing, someone mounted this little baby (the DX fisheye) on a film camera. the vignetting isn't circular, it's this weird rectangular shape. hard to describe though... guess when it's avail someone will post up a sample pix.

[scanman]

Originally Posted by ckiang Yes it can. Dunno how far it's true, but I heard from some S2 Pro users that the TTL on the S2 Pro isn't accurate. And read somewhere the S2 Pro TTL works only up to 400, dunno what will happen at ISO 800 though. Then again, D-TTL on D100 is also very erratic... Regards CK

Is it mention anywhere that normal flash could be used on S2
using normal TTL function?