Amazon Reikan Focal How To Do This
Choose camera, lens focal length and target size:Summary This is a unique lens for Nikon DSLRs: it's a fisheye, it's a zoom and it goes down to 8mm focal length producing fully circular images on full-frame/FX bodies. NOTE: Target Distance Tool is now part of FoCal, scroll down to read about the new feature You can use this online Target Distance Tool (see below how to do this within FoCal) to suggest a suitable target distance for AFMA / Focus Fine Tune lens calibration with Reikan FoCal. Target Distance Tool: AutoFocus Calibration.
The sites only the bravestor perhaps, foolishenter.Reikan has announced a major update to its AF tuning software, FoCal. These are the sites spoken of only in whispers. 2 takes you on a tour through all 47 prefectures of Japan, but this isn’t any old tour.
So this zoom covers effectively three separate fixed-focal fisheye lenses. It has an angle of view of 180 degrees and projects a circular image at 8mm on a full-frame sensor, completely covers a DX-sensor at 11mm, and completely covers a full-frame sensor at 15mm. Reikan FoCal AF calibration and lens testing software.The Nikon 8-15mm f3.5-4.5E ED fisheye is a 1.9x super wide-angle zoom. Read moreUsing my links from B&H as well as Amazon help support me and the photo education work I do. Version 2 introduces the ability to check your copy of a lens against other users' test results.
The lens hood adds another 11mm in length and has a diameter of 96mm. This is par for the course for a modern lens. X length): 78 x 83mm (3.1 x 3.3in) without lens hood at its shortest length which is at 10mm focal length. I’ll compare it mostly with Nikon’s only other full-frame fisheye, the 16/2.8D.Size (diam. I’ve rated the features with a (or ), when it’s better than average or even state of the art, a if it’s standard or just average, and if there’s a disadvantage.
Magnification: 0.16m (0.52ft) / 1:2.9 (at 15mm focal length) compared to 0.25m (0.82ft) / 1:10 with the 16/2.8D. Closest focus distance/max. Nano coating should reduce flare and ghosting. The new lens has three (extra) low dispersion and two aspherical elements. But that lens isn’t a zoom. Optics: 15 elements in 13 groups which is much more than the 8/5 of the 16/2.8D.
Their bulbous front elements prevent that. Filter-thread: None of the fisheye lenses (or any ultra wide-angle zooms from Nikon, Tamron, Sigma or Canon for that matter) offer a filter-thread. A magnification of 1:10 is achieved at around 0.27m distance which gives 14cm working distance.
Covers full frame/FX or smaller = very good. All the alternatives from Nikon and Tokina need a focus-motor in camera to drive the AF. Manual-focus override is by simply turning the focus ring. Auto Focus: HSM (Hyper Sonic Motor), so it also works on camera bodies which don’t have an AF-drive built in like Nikon’s D3x00/5×00. Image Stabilization: No fisheye lens has image stabilization. The Nikon 10.5/2.8G has a similar slot and the 16/2.8D offers a special type of screw-in filter over the rear lens-element.
The front lens-cap does arrest in place when mounted on the lens hood (see next photo) – very good! When you use the built-in flash the shadow of the lens (even without hood) is always visible at the bottom of the image at any focal length on an FF-/FX sensor. It can be removed and should be when you’re shooting circular images on a full frame sensor below 14mm focal length. The lens hood has an interlock to prevent accidental loss. Comes with a standard soft case. But to put the price of the new Nikon in perspective: The Canon 8-15/4.0 L fisheye currently sells at around 1200 EUR. 19% VAT), 100% more expensive than the 16/2.8D which can be had for around 750 EUR.
This is pretty good with no real down-side.Here is what the 8-15mm zoom projects on the sensor:Above: Nikon 8-15/3.5-4.5E coverage on Nikon D810 full-frame body at 8mm (left), at 15mm (right) the red box indicates the DX frameOn a full-frame sensor the angle of view is always around 180 degrees regardless of the focal length you use while on a DX sensor the angle of view narrows from 180 degrees at focal lengths between 8mm and 10mm to 110 degrees at 15mm.Following is the coverage of the Nikon 10.5/2.8G (with sawn-off lens hood to generate a circular image) and the Nikon 16/2.8D:Above: coverage of Nikon 10.5/2.8G (left) and Nikon 16/2.8D (right) on a Nikon D810 full-frame body the red box indicates the DX frameAnd in case you wonder how a “straight” 15mm lens would capture the same scene following is an image from the Tamron 15-30/2.8 VC at 15mm:Above: coverage of Tamron 15-30/2.8VC at 15mm on a Nikon D810 full-frame body the red box indicates the DX frame The score in the “features-department” is 0/6/7. Sealing: A rubber grommet at the lens-mount and more in the lens barrel. Same with the competition. Distance information is relayed to the camera, so the Nikon body can do all the advanced exposure-related stuff with this lens. The onboard flash of the D810 can fill the DX frame at 15mm focal length relatively well but shows heavy vignetting at 12mm and shorter focal lengths.
Be aware though that both lenses need a body with integrated AF motor to auto-focus. Nikon up to now only offered two fixed focal lenses with fisheye characteristic: the AF DX 10.5mm f2.8G and the AF 16mm f2.8D. See the following images:Above: Tokina 10-17/3.5-4.5 coverage on Nikon D810 full-frame body at 10mm (left), at 17mm (right) the red box indicates the DX frame This allows for circular images albeit with 29mm diameter at 10mm focal length which get’s cut off at the top and bottom by the sensor. If you’re using it on a full-frame body you should get the “NH” version which has no hood. It is designated as a lens for APS-C/DX-sensors but my tests showed that it covers full-frame sensors well at focal lengths of 14mm and longer.
But with the help of the appropriate adapter either the Canon or the Nikon 8-15mm zoom can be used on Sony E-mount bodies.Above from left to right: Tokina 10-17/3.5-4.5, Nikon 8-15/3.5-4.5E, Nikon 16/2.8D, Nikon DX 10.5/2.8G with sawn-off lens hoodFocus accuracy and repeatability is critical to consistently produce sharp shots. Sony users don’t have a fisheye zoom for E (or A) mount but can get a lot of fixed focal fisheyes mostly from Samyang/Walimex and the Sony 16/2.8 for A mount. See Gordon’s Canon 8-15/4.0L fisheye review. And of course it cannot be adapted to Nikon DSLRs. But it softens markedly towards the corners and exhibits some strong lateral color aberrations when used wide open. It has a street price around 1200 USD / EUR and was tested as very sharp in the center.
Amazon Reikan Focal Manual Focus Wide
Its rubberized surface is 10mm wide and can be turned with one finger. The focus ring has no slack/play between its movement and the focus-action and a throw of 55 degrees which is good enough for manual focus wide open. And there is only very little performance variation whether the lens focuses from infinity or from a closer distance.At 15mm focal length the lens focuses with no hunting in around 0.3 sec from infinity to 0.27m, which is very fast.
When I adjusted the focus from infinity to 0. Nikon put the zoom ring at the front of the lens and the focus ring behind that.AF-operation is very quiet from the outside, and if you record video with the built-in microphone the AF-drive produces a slight hiss and only faint clicks at the start or stop of focus-movements.As you pull focus, you’ll notice some focus breathing: the image becomes less magnified at closer focusing distances.
0 kommentar(er)
