• This lens is small and light, but it's still a telephoto lens with a
long focal length.
Generally, telephoto lenses are associated with a small angle of
view and higher probability of the images becoming blurry due
to magnifications of every movement of the lens know as
“camera shake”. It's recommended that you set your camera to
high sensitivity and a high shutter speed, or use a stable tripod
or monopod.
●
Preventing Blurry Images
6. Taking Photographs
Attaching the lens
❶
Attach the T-mount to the lens and then set the lens on the
T-mount to the camera.
❷
Provide a T-mount appropriate for your camera.
[Refer to 3, “T-Mount.”]
＊
Multiple types of mounts may be available depending on the camera
brand. For details, contact the camera manufacturer. (Four-Thirds, Micro
Four-Thirds, etc.)
❶
The T-mount isn't attached to
the lens.
❷
The T-mount doesn't match the
mount on your camera.
The lens can't be attached to
the camera.
❶
Securely tighten the outer screws using a commercially
available precision screwdriver.
[Refer to 3, “T-Mount.”]
❶
The outer screws (three
locations) on the T-mount are
loose.
The mount rattles.
❶
Loosen the outer screws on the T-mount and turn the lens until
the distance scale indicator mark comes to the top center, and
then tighten the outer screws on the T-mount.
[Refer to 3, “T-Mount.”]
❶
The lens and T-mount aren't
adjusted to proper positions.
The distance scale indicator
mark doesn't come to the top
center.
❶
The T-mount has a double-structure. Once the outer screws
(three locations) on the T-mount are loosened and removed,
place the outer ring on the T-mount again and tighten the outer
screws on the T-mount, and then remove the T-mount from the
lens.
[Refer to 3, “T-Mount.”]
❶
The inner ring of the T-mount
remains on the lens.
Other mount can't be
attached.
7. Troubleshooting
You can prevent blurry images by using a cable release or self-
timer function.
In this case, be sure to use a stable, sturdy tripod. If your
camera has a mirror-up function, use the function to further
reduce the possibility of blurring.
Tip
• When a telephoto lens is used, the magnification factor
increases and therefore dust, water vapor and other matter
suspended in the air will affect the image quality. To capture
sharp images, ideally photographs should be taken on a fine
day with minimum wind following several consecutive fine days,
in a location not subject to exhaust gases, smoke from
chimneys, etc.
●
Photographing Conditions with a Telephoto Lens
It is difficult to capture sharp images in mountains and coastal
areas during the summer, because the air contains a consider-
able amount of gas and water vapor. However, your photogra-
phy can be more enjoyable if you'll take advantage of unfavor-
able conditions to create works of your own, such as capturing
the sea through vibrating air or shooting the ridgelines of moun-
tains veiled in haze.
Tip
• This lens isn't linked to the auto focus function, so the focus
must be adjusted manually. To bring the subject into focus,
simply turn the focus ring.
• With a telephoto lens, the depth of field (the range in which the
subject can be brought into focus) becomes shallow (= the
focus range is small), so it's difficult to adjust the focus.
Use a stable tripod or monopod to adjust the focus carefully.
●
Adjusting the Focus
Generally, a super-telephoto lens with a range of 300 mm or
more will have some allowance in the position of the infinitely
symbol
∞
. This is because the refractive index of light in air
changes as the temperature in the mirror cylinder changes, and
the focus position may shift slightly as a result. Accordingly, be
sure to adjust the focus carefully by checking the image on the
finder screen, even when capturing a distant view, starry sky or
other very distant subject.
Tip
If you're using a digital camera with a live view feature, you can
use the zoom-in function to fine-tune the focus.
Tip
• This lens employs reflective optics, so the aperture is fixed.
Accordingly, the amount of light must be adjusted by changing
the shutter speed. (If you're using a digital camera, you can do
this by changing the ISO sensitivity.) However, a slow shutter
speed tends to cause blurry images, so it's recommended that
you set your camera to high sensitivity and use a high-sensitivity
film (ISO400 or better).
• Auto exposure is possible on nearly any camera that offers an
AE function with aperture priority (except for certain Nikon and
Sony models)(the program AE and shutter priority AE are not
possible). Set the camera without lens to the aperture priority
AE mode, and then try taking photographs in a bright area and
a dark area. If you notice that the shutter speed differs from one
condition to the next, auto exposure is enabled.
●
Adjusting the Exposure
This lens has no electrical contacts, so signals aren't exchanged
electrically between the camera and lens. Accordingly, the
camera’s finder display or LCD screen may not come on, but
this doesn't affect the camera or lens function. (It's the same as
taking photographs with an astronomical telescope or field
scope attached to the camera.)
Tip
Condition
Remedial action
Taking photographs
❶
,
❷
Set the necessary items beforehand by referring to 4,
“Setting Up the Camera,” and your camera's manual.
❸
Set the camera’s focus mode to “MF” (manual focus).
❶
The shooting mode doesn't
support the attached lens.
❷
The camera isn't set correctly,
or the camera is set to disable
the shutter release when a lens
without electrical contacts is
used.
❸
The camera’s focus mode is
set to “AF” (auto focus). In the
AF mode the camera may not
be able to detect the focus
position of this lens, in which
case the shutter doesn't
release.
The shutter doesn't release.
❶
Neither the camera nor the lens function is affected.
❶
This lens has no electrical
contacts, so it doesn't send or
receive electrical signals
to/from the camera.
The camera’s finder display or
LCD screen doesn't come on.
❶
Turn the focus ring and manually adjust the focus.
[Refer to 6, “Taking Photographs.”]
❶
This lens is a manual focus
lens.
Auto focus doesn't work.
❶
Firmly secure the camera when taking photographs.
＊
The use of a tripod or monopod is recommended.
❷
Increase the distance from the subject.
❸
Take photographs in a place having less airborne dust, water
vapor, exhaust gases, etc.
❹
Wipe clean the lens using a soft cloth.
[Refer to 6, “Taking Photographs.”]
❶
The hand shakes when
photographs are taken.
❷
The distance to the subject is
too close.
❸
Effects of dust and water vapor
in the air.
❹
The lens is dirty.
Images become blurry.
❶
Adjust the exposure by changing the shutter speed.
[Refer to 6, “Taking Photographs.”]
❶
This lens has a fixed aperture.
The aperture can't be
adjusted.
This lens is a mono-focal lens.
The camera doesn't zoom in.
Condition
Remedial action
Cause
Other
❶
Check your camera for the type of mount, and consult the
dealer/retail shop where you purchased your lens.
❶
You can attach various
T-mounts sold separately.
I want to use my lens with a
camera of a different type of
mount (a camera from a
different manufacturer).
❶
When attaching a filter in front of the lens, first confirm that the
filter won't contact the center of the front surface of the lens.
❶
[Refer to 1, “Name of Each
Part.”]
A filter can be attached to the
filter attachment thread
⑧
or
⑨
as shown in the Fig. 1.
I want to attach a filter.
❶
Do not remove the black object. It's okay to take a photograph
as is.
❶
This is the part of the lens
structure that is used to reflect
images.
What appears to be a black
cap at the center of the object
lens (lens on the subject side)
doesn't come off.
❶
On cameras with aperture priority mode, this problem can be
compensated to some extent by correcting the exposure. On
models that only have the “M (manual)” mode, the lens is linked
neither to the AE function nor to the exposure meter in the
camera.
When using such a camera, refer to the instruction manual for
information on the appropriate shutter speed.
❶
The exposure is significantly
off.
Photographs are all white or
all black.
Condition
Remedial action
Cause
Cause
