There have been some interesting discussions about the pros and cons of various sensor sizes and how they impact angle of view, lens focal length and the depth-of-field that results. For example, some photographers bemoan the fact that it is difficult to achieve a shallow depth of field at a particular equivalent-field-of-view with a CX sensor using 1 Nikon lenses, while others find it useful to be able to get deeper depth-of-field at more open aperture settings such as f/1.8 and f/2. Some D800 shooters are concerned about diffraction setting in above f/8 when trying to achieve deep depth-of-field with a high pixel density 36mp FX sensor, as are many photographers who use high pixel density sensor DX bodies.
Having been testing lenses extensively for the past few years, I have seen all kinds of optical defects on even the most expensive / exotic lenses that cost thousands of dollars. One of the most common issues I have seen so far is lens de-centering, where a single optical element or a group of elements are not properly aligned with others, resulting in uneven performance across the frame. Some lenses have very slight de-centering, which only software like Imatest can reveal, while others have very noticeable de-centering (particularly lower-end zoom lenses), where a portion of the frame would always appear less sharp in images. Then there are other optical issues that also impact the overall contrast and sharpness of lens. And testing lenses with all kinds of optical issues can often be a challenging task.
I have just added another section to the Camera Comparisons page of the Olympus OM-D E-M1 review, where I provided RAW performance comparisons between the OM-D E-M1 and the Fuji X-T1. Some of our readers requested this comparison, so here it is for those that just want to see this particular section of the review. Although the X-T1 has a similar resolution of 16.3 MP, it is physically larger in size (APS-C vs Micro Four Thirds) and hence has larger pixels than the OM-D E-M1. Let’s take a look at ISO 200 (Left: Olympus OM-D E-M1, Right: Fuji X-T1):
Grimsby Ontario is on the raptor migration route and every year the town holds an indoor “RaptorFest” event at the local hockey arena during which various presentations of live birds, and educational initiatives are conducted. A fast, mid-range telephoto like the Nikkor 200mm f/2G VR would be the perfect lens to photograph birds during this indoor event. Like most people, I don’t have the $6,000 or so it would take to own the 200mm Nikkor…but I thought I might have a reasonable solution in my camera bag.
One of the frequently asked questions by our readers when we post information on Zeiss lenses (which are often optically stellar), is why Zeiss does not make autofocus lenses for DSLR cameras from Nikon and Canon. As you may already known, Zeiss is currently making autofocus lenses only for two specific mounts – Sony E (for NEX / Alpha series mirrorless cameras) and Fuji X. This line of autofocus lenses labeled as “Touit” is limited to a few lenses at the moment, with full autofocus capability and compatibility with both Sony and Fuji mirrorless cameras. So one might naturally ask why Zeiss has finally started making autofocus lenses and wonder if it has plans to start developing autofocus lenses for Nikon and Canon mounts. Although I have known the reason behind this for a while now, I decided to ask the question again from the Zeiss team at the Photo Plus show in NY last year. Specifically, I wanted to find out if Zeiss is planning to change their strategy in the future in regards to DSLR lenses.
This article is written in response to “The Question of 18-300mm Lenses” article written by Romanas Naryškin. I used to like my 18-300mm zoom – I called it my Guilty Pleasure Lens (GPL). It was hands-down the most fun lens I ever shot with. When I wanted to just go out on an adventure outside and had no idea what I’d run into, instead of grabbing my FX body, my 16-35mm zoom, 50mm prime, 105mm macro, 80-400mm zoom and of course a manservant to carry all that gear, I’d grab GPL and my D7000 and blast on down the trail. Sure GPL wasn’t the sharpest knife in the drawer, but neither am I. In our shared ignorance we’d shoot grand vistas or cool nature abstracts or maybe even crawl through the dirt for a close-up or two. What a fool I was thinking I’d found a partner that liked to do all the things I liked to do.
Earlier this week, Ricoh Imaging introduced the Pentax 645Z, a high resolution 51.4 MP medium format DSLR camera. While Nikon has been relatively quiet on the resolution front with its now 2+ years old 36 MP D800/D800E models and Canon has not stepped up above 24 MP, Pentax is stepping in with a larger sensor that provides super high resolution 51.4 MP images. With its 43.8 x 32.8mm size sensor, the 645Z has a smaller version of the medium format (MF) sensor that is similar in size to the Leica S-System, although with a different aspect ratio of 4:3 vs 3:2. Compared to full-frame sensors, the physical size of the 645Z MF sensor is about 166% (or 1.66 times) larger, which is a huge difference. Enough of a difference to allow for relatively large pixel size of 5.3 microns – bigger than 4.8 microns on the Nikon D800/D800E. Why does this matter, you might ask? Well, that’s because the Pentax 645Z comes with a CMOS sensor, which is similar technology as we see on all modern DSLR cameras. Compared to traditional CCD sensors used on medium format cameras, a CMOS sensor is capable of yielding images with very little noise at high ISO sensitivity levels. As a result, the Pentax 645Z has an ISO sensitivity range of 100 to 204,800, which is a mind-boggling number for a medium format camera.
Sigma announced the new Sigma 50mm f/1.4 Art lens back in January of this year, but we were left with a couple of big unknowns such as the price. I guess it has become the latest trend to announce early development efforts by a number of manufacturers now – Nikon did the same with their Nikkor 800mm f/5.6 lens and the D4s DSLR camera. A couple of days ago, Sigma finally announced the pricing and availability of the Sigma 50mm f/1.4 DG HSM “Art” and I must say, after hearing rumors about Sigma challenging the Zeiss Otus 55mm f/1.4 in optical quality, I was very surprised to find out that the lens is going to be retailed for $950. As you may already know, I am a big fan of the new revamped line of Sigma lenses. After reviewing the 35mm f/1.4 Art, I was blown away by its sharpness, focus speed / accuracy and color rendition. So when Sigma announced the 50mm f/1.4 Art series, I looked at the MTF charts and knew immediately that the lens will not disappoint.
There is a lesson here for all, especially when purchasing expensive gear. Expensive is a relative term with a value that varies per individual and can’t be generalized, the stuff being said here applies to all values of items. It comes down to how much value the item has to you and whether you are willing to risk that value versus the warranty programs being offered. Obviously the bigger the expense, the higher the risk.
I have been shooting with the Fuji X-T1 for the past several weeks and I must say, I am just blown away by what this little camera can do. While I will be working my way to a review fairly soon, I wanted to provide a quick summary of my thoughts so far on the X-T1, along with some sample images using the 35mm f/1.4 and 56mm f/1.2 lenses. Ever since I received the X-T1, I just cannot stop myself from taking it every time when I go outside. Pretty much everything about the camera feels right to me – from the amazing controls and dials on the top, to the fast and responsive autofocus and the huge electronic viewfinder (EVF), making the camera a pure joy to use.