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Photometer 2 Instruction Manual

DLGelectronics.com

1

PHOTOMETER 2

Focal Plane Metering System

For

Large Format Photography

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Summary of Contents for PHOTOMETER 2

Page 1: ...Photometer 2 Instruction Manual DLGelectronics com 1 PHOTOMETER 2 Focal Plane Metering System For Large Format Photography ...

Page 2: ... DLGelectronics com 2 CONTENTS Introduction 3 Introduction to Focal Plane Exposure Metering 4 Using the Photometer 2 5 Technical And Performance Data 10 Circuit Diagram 12 Warranty Servicing Repairs and Enquiries 13 Specification 14 ...

Page 3: ...to be optimised taking into account shadow and highlight areas ensuring that detail within these areas is captured in the negative The Photometer 2 provides image plane metering at an affordable price in a simple easy to use and robust metering system The Photometer 2 comprises a metering unit a frame which is inserted in the camera in place of the film carrier with integral metering probe and a c...

Page 4: ...milar situations can arise when photographing dark objects against the sky or in a snow scene or when trying to photograph a brightly lit subject against a dark background Incident Light Metering Incident light metering partially addresses this issue by indicating an exposure setting based on the light falling on the subject of interest in the scene In our cave example an incident light reading co...

Page 5: ...USING THE PHOTOMETER 2 Components of the Metering System The metering system comprises 1 The meter 2 Frame including rear shutter 3 Sensing probe 4 Connecting cable Insert 9V battery type 6LR61 1604A PP3 The battery compartment is on the rear of the case ...

Page 6: ...ces Insert the metering probe into the wider of the two slots in the top of the frame if it is not already inserted The sensor should be facing the front lens of the camera If it is not clear which side is the sensor the connector block at the other end of the probe should be on the front side A white circle on the rear of the metering probe indicates the location of the sensor Connect the probe t...

Page 7: ...ure in the image When the hold buttons are pressed the currently metered brightness value is stored in the meter in the corresponding memory Turning the on off 1 2 switch to the hold 1 or hold 2 positions displays the stored brightness A typical use might be as follows 1 Measure the image brightness in a shadow area of interest Adjust the exposure controls to give a reading of say two stops down f...

Page 8: ...he sensor The display indicates the brightness of the image relative to a notional 18 grey value for the Display light push button Brightness indicator Push to test battery Exposure control set the desired exposure Range control set fractions of second seconds minutes or hours of exposure Use the HOLD buttons to store the current brightness in memory 1 or memory 2 On off switch and input setting p...

Page 9: ...ferent film speeds from 32 ASA to 1600 ASA For film speeds not in this range allowance must be made or the exposure settings adjusted accordingly HOLD buttons Pressing either of the HOLD buttons memorises the current brightness in that storage location irrespective of whether the INPUT control is in the ON HOLD 1 or HOLD 2 positions The HOLD functions memorise the brightness not the display the di...

Page 10: ...rs Calibration The meter has been calibrated to give a negative tone in the centre of the useable range Film tests have been carried out to determine the optimum point See figure Note that the film base is not perfectly transparent and typically transmits around 50 of the light The test data has been adjusted accordingly to give 0 for the lightest possible around 50 transmission negative and 100 f...

Page 11: ...esponse is at 530nm green Response at extremes of the spectrum will be within a factor of two one stop In practice in normal situations where highly saturated colours at the extremes of the visible spectrum are not normally present no correction factor need be applied for colour ...

Page 12: ...j 1 1k 20k R43 3k R1 1M VR1 100k VR1 100k R6 5 1k VR2 10k Q1 BC548 Q2 BC548 IC4a LF442 R3 43k R3 43k R2 6 2k R2 R2 6 2k R2 R6 D1 D1 D1 D1 C8 0 001 Vref Vref Vref TH1 4 7k 25 C 4 C IC4b LF442 IC4b LF442 C6 0 1 C7 0 1 IC5a TL062 IC5a TL062 IC5b TL062 IC5b TL062 IC6a TL062 IC6a TL062 R7 10k R8 10k R9 10k IC6b TL062 IC6b TL062 Vref Vref 1 s h 1 s h Vref 2000 1 SW2 Exposure Vref Vref 1600 125 25 R12 5 ...

Page 13: ... of damage or defects please contact us at enquiries dlgelectronics com or write to us at DLG Electronics 138 Osmaston Road Derby DE1 2RF UK or contact your local distributor For units outside warranty we can offer cost effective repair refurbishment or replacement with a refurbished model if you return your damaged unit Please do not send us your meter until you have contacted us We welcome any f...

Page 14: ...tion hour to stop minimum Peak Spectral Response 530 nm Power consumption 10 mA approx battery monitor and display light off Battery type PP3 Battery reverse connection protection Yes Settling time 1s exposures 1 2000s to 1s at 125 ASA 10s exposures 1s to 1 min at 125 ASA 1min exposures 1 min to 1 hr at 125 ASA Sensor Resistance Weight 12 oz approx Dimensions Meter Unit 4 x 6 x 1 Metering Probe 10...

Page 15: ...Photometer 2 Instruction Manual DLGelectronics com 15 ...

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