Quantum CALCU-LIGHT X Operating Instructions Manual - page 4
Multiply footlamberts by 3.48 to convert to candela/m
2
.
8. ACCESSORY ATTACHMENTS
SX-1 spot attachment
This attachment measures a 10° angle for reflected light, compared to 30° for the standard reflected mode. No
compensations are necessary. Use the reflected window pointer of the dial.
CFX-1 and 2 filter attachments
These accessories provide for filtered light measurements. The filters supplied are standard photographic types.
CFX-1 contains the 80B, 85B, 25A, 8 and 4x (neutral density) filters. CFX-2 comes with the 81A, 82A, 11 and 21
filters. All common filter types are additionally available separately. CFX-1 is the basic set that contains a special
turret for mounting the filters.
Now when using a particular filter on a camera, the same type can be mounted on the meter. Filter factors, and their
variations due to color temperature of light sources can be dispensed with. Use the reflected window pointer.
FOX-1 fiber optic probe
This accessory measures reflected light values of 1/8 inch (3mm) diameter areas on focusing screens, ground glass,
light tables and other luminant objects. It permits exact readings of scene contrast, and serves as a densitometer for
negatives and transparencies with a resolution of 0.1 density units. Use the reflected window pointer. Additional
information is supplied in the FOX-1 instructions.
DX-1 flat diffuser
The purpose of the flat diffuser attachment is to make calibrated illumance measurements and contrast
measurements with studio lighting. Its applications are better described in the CALIBRATED MEASUREMENTS
section.
Consult your photographic dealer for recent additions to the Calcu-Light/Calcu-Flash digital light measurement
system.
9. PROBLEMS & SOLUTIONS
1. Digits only read 00.
Be sure nothing is blocking the light turret. Also, hold the MEASURE control long enough to obtain a reading.
2. Two readings of the same scene differ by one or two digits.
Usually, there is nothing wrong. Calcu-Light measures in precise 1/3 stop increments. Slight changes in position or
lighting are detected. If you measure fluorescent lighting you will detect the strobing effect, reminding you to shoot
slower than 1/125 second. Use the average of the highest and lowest reading.
3. Battery indicators appear momentarily after MEASURE control is released.
This simply indicates that the battery check circuits function. The batteries are good unless the indicators appear
while the MEASURE control is pressed.
4. Instrument shows no display.
Be sure the batteries are connected. Clean the contacts and springs if necessary.
10. SPECIFICATIONS
Intermediate Film Speed Markings