NikonGear'23
Gear Talk => Lens Talk => Topic started by: Macro_Cosmos on May 20, 2017, 10:48:31
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https://www.youtube.com/watch?v=QbZoydUfVCQ
Ken Wheeler aka The Angry Photographer adapted the Nikon DX 10.5mm fisheye to the GFX via a fotodiox adapter.
Full 220° coverage on the medium format (crop) sensor!
Really interesting.
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Sorry, no 220 degrees coverage ... just moving the lens over to another camera doesn't change its optical properties.
On the DX you get the designated 180 degrees. Shave off the hood and put the camera on an FX or larger one gets a maximum of ~200 degrees if the deteriorating quality outside the basic 180 is ignored. With the FX, top and bottom of the circle are cut off, but one can do a composite of two images with the camera rotated 90 degrees for the second frame.
An example of the 10.5 mm Fisheye-Nikkor on an FX body (D750). Do note how easy it is to get the photographer himself included in the frame.;
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If real 220 degrees are desirable, then here is the solution ... No wonder Erik has such a big smile.
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Here's one of the rarest Nikkor: 6.2mm f5.6 SAP fisheye that offers 230 degree.
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I have a line on one of of these, but the owner cannot be convinced to sell it :( Oh well, probably saves me a bundle.
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The SAP is much rarer than 6mm/f2.8 fisheye, and can be sold for much higher price.
By the way, I've heard that Nikon never sold the SAP fisheye and only leased. So, it should be "technically" impossible to be on the second-hand market.
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I was under the impression he had that particular model, but might be mistaken. It is however, f/5.6 and 6 mm or thereabouts, and definitively not the 7.5 mm. I've seen (poor) snapshots of the lens, but as email attachments they are gone long time ago.
What irks me ever so slightly is that I was offered the 6 mm f/5.6 by Nikon Norway in the 'mid 70s and procrastinated a little too long to get it so another customer bought it, thus instead I had make do with the 10/5.6 OP which for my purpose probably was even more useful.
Nikon Norway (now Nikon Nordic) made up for this later when they cleaned out their inventory towards the end of the '90s and found a forgotten 8 mm f/2.8 pre-AI still in its unopened box. I got a phone call and was asked whether I had interest in the lens, to which request I answered 'maybe, depends on the price. And since it is pre-AI won't be willing to pay too much." They agreed and I got the lens for USD 150 (approx.). Snooped around and found an AI-kit for the 6/2.8 from Pacific Rim Camera, that also should fit the 8/2.8. It did. Thus I got my 8/2.8 Fisheye-Nikkor with A-modification included I'd for a total of less than USD 200.
A pity such deals are virtually non-existing these days.
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A pity such deals are virtually non-existing these days.
Yeah, because the internet has disclosed everything, not only the secondhand prices but also the national secrets. ;D
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More like the trend towards globalisation and ever more centralised company structures. Distance to the contact persons increases and concomitantly the communication weakens.
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Sorry, no 220 degrees coverage ... just moving the lens over to another camera doesn't change its optical properties.
On the DX you get the designated 180 degrees. Shave off the hood and put the camera on an FX or larger one gets a maximum of ~200 degrees if the deteriorating quality outside the basic 180 is ignored. With the FX, top and bottom of the circle are cut off, but one can do a composite of two images with the camera rotated 90 degrees for the second frame.
An example of the 10.5 mm Fisheye-Nikkor on an FX body (D750). Do note how easy it is to get the photographer himself included in the frame.;
;) I can certainly see you there!
200 degrees is still larger than 180, which means the lens can see behind itself, right? I'm not too certain either way, had no experience with the 10.5mm. If shaving the hood grants a 200 degree then yes, no matter which format, it will remain at 200 degrees. I also wonder if the 10.5mm is able resolve that 50mp Fuji... it should perform better actually, less demanding on pixel density? -- just my speculation.
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Here's one of the rarest Nikkor: 6.2mm f5.6 SAP fisheye that offers 230 degree.
:o woah looks very... nifty!
Which format is it designed for?
I actually contacted Laowa himself and he told me that a 220 degree fisheye can be made at a very small size, f/2.8, but he currently has no interest in making such a lens.
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:o woah looks very... nifty!
Which format is it designed for?
It has the Nikon-F mount, so it should be safe to assume that it is designed for 135 (or FX) format.
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so...if I mount a 24X36 lens on a medium format camera...it will give me a wider FOV? :o :o :o is this how it works? I worked on a studio modifying (simple) camera equipment for special scenes but I do not know that this thing works.
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so...if I mount a 24X36 lens on a medium format camera...it will give me a wider FOV? :o :o :o is this how it works? I worked on a studio modifying (simple) camera equipment for special scenes but I do not know that this thing works.
Yes, but usually its image circle will be too small to cover the entire frame of the larger format. If the lens is not of a telecentric design, the image circle can be larger if you focus closer (or more precisely, if you move the lens (meaning, the entire optical system) further away from the image plane).
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yes, that was what we saw when we adapted 8mm lenses for FX :o :o :o so the point is lost because we got a black edge.
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Yes, but usually its image circle will be too small to cover the entire frame of the larger format.
Even if the lens image circle is larger than FX format, the image quality outside the FX limit could be poor.
Similarly with DX lens on an FX camera. At some zoom settings the lens may cover FX format but the corners are not guaranteed to be sharp, and of course at other zoom settings the lens will not cover FX so there will be heavy vignetting.
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With Circular Fisheye lenses one tend to care less about the image quality in the corners,,,
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https://www.youtube.com/watch?v=QbZoydUfVCQ (https://www.youtube.com/watch?v=QbZoydUfVCQ)
Ken Wheeler aka The Angry Photographer adapted the Nikon DX 10.5mm fisheye to the GFX via a fotodiox adapter.
Full 220° coverage on the medium format (crop) sensor!
Really interesting.
He starts off with this statement:
,,,This lens has a 220 millimeter field of view,,,,
No real need to see more, says it all,,, He's of course wrong in all departments, it's neither 220 millimeters nor 220 degrees.
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He starts off with this statement:
,,,This lens has a 220 millimeter field of view,,,,
I noticed that, too. :D
Image quality aside, I would seriously doubt if the 10.5mm DX fisheye really offers the 220 degree angle of view when the hood is cut off. Even in the default condition, the hood doesn't shade the very corner of the lens. If the lens has the potential to cover 220 degrees, it should be a 220 degree diagonal fisheye in the first place.
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As Bjørn stated to start off with it's not 220 degrees!!!
It's about 200 degrees,,,
To give a good quality image on DX of 180 degrees in full frame as Roland states,,,
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As Bjørn stated to start off with it's not 220 degrees!!!
It's about 200 degrees,,,
To give a good quality image on DX of 180 degrees in full frame as Roland states,,,
Thanks for the note, Erik. I missed that...
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so...if I mount a 24X36 lens on a medium format camera...it will give me a wider FOV? :o :o :o is this how it works? I worked on a studio modifying (simple) camera equipment for special scenes but I do not know that this thing works.
All lenses have an image circle (or more precisely a cone) outside of which no light is transmitted, however that edge is not a sharp one. At small apertures the circle is at the maximum usable size. At large apertures, shadowing by parts of the lens body itself blocks some of the light and causes vignetting.
As it is a cone, if you have sufficient extension, the coverage on the sensor/film can be greater as magnification is higher, but this does not affect maximum angle of view, just crops what is being shown.
If you look near the edge of the image circle you notice that there is light fall-off and poorer imagine performance. Usually the lense is designed to have this occur outside the frame as much as possible, but often we hear that a lens is "soft in the corners". This means that not all of the available image circle is being used.
With a fisheye, if you can see the edge of the circle on one format, going to a larger format is not going to show you a greater angle of view. It can only show you parts of the image circle which previously landed outside the sensor. In most cases this is the worst performing part of the lens and has been excluded intentionally.
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a (slightly modified for film camera use) 2.8/6mm 220 degrees is on ebay now (UK seller) :-)
--> Eric??
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No thanks ;) Quite the modifications and a bad looking non original mount.
Nice they cut off the huge foot though,,, :) much more easy to mount a full size DSLR!
Also someone had a tremble when they repeatedly fiddled with an apparently not so well fitting large lens spanner,,, OMG :o :o :o