500mm F:8.0 MF
F8.0 SUPER SPECTRA COATING
T Mount FOR
PANASONIC MFT Included
THIS IS NOT AN AUTO-FOCUS LENS
The BOWER Catadioptric or Reflex Mirror Lens is
a highly developed computer designed product, using the merits of both reflex
optics and refraction optics. This gives you very sharp picture quality
with less color aberration, which is considered the most harmful factor in the
field of telephoto photography
FOCUSING YOUR LENS
Focusing is accomplished while viewing the subject
through the view-finder of your camera and rotating the focusing ring. Since
the aperture is preset, you will find under certain light conditions a shadow
appearance on the split-image section of your focusing screen. In this case,
simply focus on the edges of your subject with the outer center of your
Note: In order
to compensate focusing when normal focusing position may differ due to extreme
temperature change, the focusing ring has been designed to allow rotation
beyond tile fixed engraved marks of the distance scale, to avoid error,
focusing should always be made while looking through the view-finder
adjustment of focusing is necessary when taking infrared photography, as is
required with normal lenses.
LIGHT AND CONTRAST CONTROL
Since the reflex lens is not
equipped with a diaphragm system, the use of filter plays an important factor
in the control of light and contrast.
3 FILTERS INCLUDED
SKY LIGHT , ND-2X , ND-4X
3 FILTERS: ( INCLUDED)
Normal ( IA Skylight ) : This filter should be used
whenever no other filter is necessary.
ND 2X and ND 4X ( Neutral Density ) : This filters
control the light passage since no diaphragm system is provided in the reflex
lens. Exposure factor is 4 times with a ND4X, i.e., the light in-take through
the lens is decreased similarly as it, stopping-down a normal lens with an
aperture, by 2 stops.
Note: ND filters
reduce light passage only, and the depth of field cannot be changed.
OTHER FILTER YOU CAN USE WITH
THIS LENS ( NOT INCLUDED )
Y52 (Yellow ) : This filter is used when taking black
and white pictures. It makes a blue background darker. Quite effective when
taking shots of Clouds on a blue horizon.
056 ( Orange ) : This filter makes Blue or Green color
lines darker and, Yellow or Red color lines lighter than seen with the human
eye. Quite effective when stronger contrast is desired.
R60 ( Red ) : Used to express day-time scenery as a
night scene, or emphasis and strengthen contrast exceptionally. Also,
necessary when taking infrared black and white exposures.
Note: In case
the subject to be taken indicates too much light or over exposure as indicated
by an exposure meter reading, or LED warning signal of the camera, adjustment
of the light in-take is controlled by using one of the ND filters. When using
a R60 filter with an aperture preferred camera. an aperture adjustment to the
camera between +0.5 to +1.0 is required.
EXPOSURE OR APERTURE ADJUSTMENT WITH TTL CAMERAS
Since tile aperture of the reflex lens cannot be changed,
the exposure is controlled entirely upon the shutter-speed being used.
The speed-dial is set according to your TTL reading. Both
aperture and shutter priority automatic cameras will automatically set the right
speed with its auto exposure mechanism, except a few models which it is
necessary to operate on a manual function.
In aperture priority or manual operation of a camera,
appropriate shutter speed must be adjusted using 3 neutral density filter in
case of over exposure readings or the camera's LED warning light is activated.
If your camera is a manual TTL system, then Simply follow
the exposure indicator in the viewfinder by compensating with the shutter-speed.
In case of excessive light beyond the shutter speed capability, attach a
Neutral Density Filter to Reduce the overall light passage.
CAMERA WITHOUT TTL SYSTEM
When using a camera without a TTL system and filters,
except for the normal filter, the exposure must be stopped down as indicated in
the following table to the shutter speed indicated by a exposure meter reading,
i.e., with the 300mm f5.6 Reflex lens, the setting would be f5.6. If a Y52
filter under daylight conditions is used, the stop-down will be 1. That is, if
the appropriate shutter speed is metered as 1/1000 seconds using a single
exposure meter with a f stop of 5.6, then, the shutter speed setting must be
Note: If a
1/2 shutter speed adjustment is indicated, generally to negative film, a full
one stop should be taken. When a reversal film is being used, disregard the
half-stop setting and use a normal shutter speed.
DEPTH OF FIELD
The area in acceptable sharpness in
front of, and behind, the subject in focus is called the Depth of Field. The
aperture selected and the distance of the subject, as well as, the focal length
of a lens determines such depth of field.
Because of the longer focal length
of your Reflex lens the depth of field is acutely narrow, for example, with a
800mm F8.0 lens, at a distance of 6 feet, the depth of field is only 1/2 inch
wide. Therefore, it is recommended to first practice focusing with your lens
before taking any serious pictures, especially in close-up photography. It is
suggested that a focus magnifier be used to help determine the depth of tield
sharpness under such extreme conditions.
COMPATIBLE CAMERA MODELS
New Page 1
PANASONIC SLR MFT
PANASONIC SLR MFT
|| DMC-GX1KBODY |
|| DMC-GX1XS |
|| DMC-G3KW |
|| DMC-G3KR |
|| DMC-GH2S-BODY-ONLY |
|| DMC-GH2HK |
|| DMC-GF2KK |
|| DMC-GF3XR |
|| DMC-GF3XK |
|| DMC-GF3KBODY |
|| DMC-GF3KW |
|| DMC-GF3KT |
|| DMC-GH2K-BODY-ONLY |
|| DMC-GF1C-K |
|| DMC-GH1K-Body-Only |
|| DMC-GF2CK |
|| DMC-GF2KS |
|| DMC-GF2CR |
|| DMC-G1K |
|| DMC-G10K |
|| DMC-G1R |
|| DMC-G2K |
|| DMC-GF1K-K |
|| 02-2012 |
BOWER Reflex Mirror Lens