The lens Canon TS-E 90/2.8 — the other representatives of tilt/shift of lenses about which we started speaking in the previous article the Impression of tilt/shift lens Canon TS-E 17mm f/4L
The lenses Tilt/Shift allow
— a lens inclination concerning the image plane;
— to shift it aside, concerning the image plane;
and to rotate.
Why all these are so necessary?
If you photograph the high building on a usual lens, you have three ways.
The first way — it to direct a lens up. But thus there is a strong distortion of a picture, the prospect amplifies, and vertical lines start “being filled up” strongly in the top part of a shot.
The second way — to shoot from above, having inclined a lens down. Then the building extends and verticals meet below. Even less pleasant.
The third way is to shoot, having directed an optical axis of a lens perpendicular to the building. Then verticals will remain vertical, but hardly you will manage to seize all building in a shot at responsible distance of shooting from the building.
How to correct the meeting verticals?
It is possible to try to correct everything on the computer. In Adobe Camera Raw there is a Lens Corrections tab in which it is possible to correct many perspective distortions manually.
The problem of this method is that distortions are eliminated by extension of a picture and respectively with decrease in its quality to 50%.
Depending on from what party the image was distorted initially (verticals met above or below), the building will turn out flattened or extended. Respectively at correction (alignment of verticals) on the computer of edge will be cut off, but the building will be the wrong proportions. Further correction of building height wil make the quality of a photo bad due to interpolation of missing pixels.
Shift-effect can help the photographer, who shoots the architecture, with mooving of a lens concerning the image plane.
Actually this effect opens much more opportunities.
We receive means of production of panoramas. You won’t be disturbed by specification of your pictures as you increase your matrix (virtually) according to force of shift of an optical axis of a lens.
You can shift a lens to the left, to the right, up, down and to do pictures. Subsequently to sew the received images in Adobe Photoshop (function Auto-Align–Reposition) and to enjoy a multimegapixel panorama (~ 60% increase in a shot for the full frame camera. 21 Mpiks–33.6 Mpiks).
When shooting landscapes it is often difficult to us to take in DOF both forward and a background at the same time.
For example, flowers in the foreground and the mansion on a background.
A zone of the best focus is marked with the red line. As you can see, only on F16 we manage to take both in sharpness depth. But thus both objects are on borders of DOF and won’t be ideally sharp. Not to mention that F16 — value of a diaphragm of a lens which exceeds a diffraction limit for the majority of modern cameras and therefore too brings the contribution in decrease in sharpness of a photo.
And here we are rescued by Tilt-effect which allows to place DOF not perpendicular to the image plane, and according to the principles of Shaympflyuga (see an illustration).
The lens has the metal case, unlike many plastic autofocal lenses Canon. But also it costs a lot. Focusing from hands is complicated, it is better to use a tripod.
Optical quality is height, but it is some falling os sharpness at extreme tilt angles.
It is especially interesting to the photographers who are engaged in subject shooting. On the one hand, it doesn’t give such strong effect as more wide-angle TS-E lenses, and with another — it gives bigger scale. I.e. if for shooting of architecture it is better to take Canon TS-E 17mm f/4L, Canon TS-E 24mm f/3.5L or Canon TS-E 45mm f/2.8 , for a pretag — Canon TS-E 90/2.8
It has also small minuses. At the high quality it isn’t a macrolens and doesn’t allow to shoot with a big scale, unlike Canon 100/2.8L Macro and Canon 180/3.5L Macro.
This problem can be solved in two ways:
— lengthening rings
In other DOF of this tilt/shift lens changes: the wedge of DOF rises if you are focused on a short distance, and falls if you are focused on a distant distance.
How to find the plane of the highest sharpness
You find the highest points of subjects on forward and a background (X and Y on the picture). If you imagine a board, it will lie on points of X and Y. The plane of Shaympflyuga (the highest sharpness) will lie on the middle of height of X and Y (to pass through points of A and B).
coming back to the lens Canon TS-E 90/2.8 …
There are small castors on the lens — stoppers (it is noted by a blue circle) and big castors for movement of parts of a lens (it is noted by a red circle).
The stopper is weakened and the lens is displaced (shift) to the left-to the right or bends (tilt) up/down.
Actually I write the directions purely conditionally as at turn of a lens all directions change.
On a photo above the lens is displaced to the right, concerning the image plane (shift) and inclined (tilt) down.
One the photo above a lens is without shift, but with tilt to the left (it is simply turned).
On this photo the red arrow showed a stopper which fixes a lens in one provision of turn. The lens rotates on 45 degrees.
Use of the lens Canon TS-E 90/2.8
As you can see, the difference is considerable. We have much sharper image with tilt. Thus a diaphragm in both pictures is identical.
But tilt-shift lenses though interesting, can be applied generally to flat objects, such as coins, hours, rings and so forth.
For example, if you photograph a separate pearl, tilt-shift the lens won’t help you in any way. Other means about which I tell on the courses according to the subject photo are necessary for this purpose.
That finally to please you, I attach the big book with the beautiful photos made on tilt-shift lenses.