Show us you circular fish-eye images

[Jørgen Ramskov]

Thanks for the comments guys.

Jakov: Until a few days ago, I didn't have a DX body. I now have a d40x to be converted into and IR camera before long.

[Jakov Minić]

Here is a shot of a tower on a hill close to Belgrade called Avala.
IR D200 + Sigma 8/3.5 fish-eye

[Bjørn Rørslett]

A circular spring ....

[Jakov Minić]

Oh how I love my circular fish-eye in IR
The same subject with so many possibilities of shooting and post processing. Loads of fun 

[Akira]

Jakov, I like your sense of color.

[George B]

Hello.  Really enjoying the site and have been following for a while.  Thought I would throw my hat in the ring so to speak with a couple fish-eye images taken recently. 
Df and Fisheye-Nikkor 8mm/2.8

George

[chris dees]

Hello.  Really enjoying the site and have been following for a while.  Thought I would throw my hat in the ring so to speak with a couple fish-eye images taken recently. 
Df and Fisheye-Nikkor 8mm/2.8

George

Welcome to NG, quite a good start with these images.

[Erik Lund]

Very nice framing and post prosseing;)

[Jakov Minić]

Jakov, I like your sense of color.

Thank you Akira!

Joost, some really dramatic black and white images, I like them!

[FGAng]

A couple more shots from the previous days.

#1

Træer ved Jernhatten by Joergen Ramskov, on Flickr

Jørgen I went to your exif to find some information: D750 Lens Info - 8mm f3.5, I assume this is the Samyang/Rokinon 8mm, is that right?

Appears to be full circular fisheye on FX.

played a bit with my son's  samyang 8/3.5 indeed no full circle on fx

But Fons' photo is not full circle on FX?

I am about to pull the trigger, so to speak, on Amazon to buy the Samyang 8mm, sight unseen, no chance to try it out, but it would defeat the purpose if it is not full circle!

I am using D800 and Df.

Help!

[Akira]

Hi, FGAng.

The 8mm fisheye Jørgen uses is Sigma which is designed as a circular fisheye for FX (or full-frame).

On the other hand, Fons uses Samyang 8mm/f3.5 which is designed as a diagonal fisheye for DX (or APS-C).  Its lens hood is removable.  Fons uses the lens without the hood which yields a circular image without vignetting caused by the hood.  However, its image circle is the same as the diagonal size of APS-C format which is roughly 28mm and larger than the shorter side of the FX frame (24mm).  That's why Fons' image is cut by the FX frame.

[Jørgen Ramskov]

Jakov: Cool yellow shots! Particularly the strong/sharp yellow color in the first one.

George B: Welcome. Those are very nice introduction shots

Jørgen I went to your exif to find some information: D750 Lens Info - 8mm f3.5, I assume this is the Samyang/Rokinon 8mm, is that right?

Appears to be full circular fisheye on FX.

But Fons' photo is not full circle on FX?

I am about to pull the trigger, so to speak, on Amazon to buy the Samyang 8mm, sight unseen, no chance to try it out, but it would defeat the purpose if it is not full circle!

I am using D800 and Df.

Help!

As Akira already wrote, it's the Sigma AF 8mm F3.5 EX DG I recently bought and I use it on a D750.

[FGAng]

Hi, FGAng.

The 8mm fisheye Jørgen uses is Sigma which is designed as a circular fisheye for FX (or full-frame).

On the other hand, Fons uses Samyang 8mm/f3.5 which is designed as a diagonal fisheye for DX (or APS-C).  Its lens hood is removable.  Fons uses the lens without the hood which yields a circular image without vignetting caused by the hood.  However, its image circle is the same as the diagonal size of APS-C format which is roughly 28mm and larger than the shorter side of the FX frame (24mm).  That's why Fons' image is cut by the FX frame.

OK I understand now.  If we take the ideal DX (18 x 24) being half of FX (24 x 36) the DX diagonal would be 30mm.  So as a diagonal fisheye for DX the image circle would have to be around 30mm > 24mm so I won't get a nice circle.

Maybe this is a silly question, hopefully not, but 8mm being 8mm, the Sigma being designed as circular fisheye for FX, it follows that if I use the Samyang and in post process remove the "excess" image to form a nice circle, I should have the same image captured by the Sigma had it been used instead.  Is this correct?  I realize this is a long unwieldy sentence...

As Akira already wrote, it's the Sigma AF 8mm F3.5 EX DG I recently bought and I use it on a D750.

Oh silly me, it was you who initiated the thread with that to-buy-or-not-to-buy question.

[Bjørn Rørslett]

The answer to that long and unwieldy sentence is 'it depends'. Actually, depends on the exact projection equation used in the optical design.

Ignoring any near range differences, an 8 mm lens on-axis will yield the same magnification  of detail, but not necessarily the same field of view. Looking at this in reverse, the same field of coverage might be produced by lenses with different focal lengths. For example, my 8 mm f/2.8 and 10 mm f/5.6 fisheye-nikkors both cover 180 degrees, but the manner in which this coverage is manifested will be different. See the examples below.

[Akira]

Samyang makes fisheyes for three different formats (FX, DX and m4/3).  What makes Samyang (also sold under some different brand names like Bower) unique is that all three fisheyes are of stereographic projection type.  Given the format size is the same, the focal length of a stereographic projection fisheye is the shortest, and thus its magnification factor of the central area is the lowest.

On the other hand, the peripheral parts of the image by a stereographic projection fisheye is much less squeezed than the ones by the fisheyes of all other projection types, and thus the resulted entire image is the most natural.

I personally prefer the images by Samyang fisheye and used as a super-wide angles, although Samyang doesn't make any circular fisheye.