As you see I used my Wejex sensitometer for this test. When I did the "Great Sensitometer Shootout" I tried not to show favoritism. But, when I actually need to make a control strip, there were some reasons I choose the Wejex.
The Wejex has a un-frosted very low wattage bulb that is not likely to blacken like an enlarger bulb. The frosted plastic is just below the step wedge.
The Wejext is timed with a stepper motor and rotating disk shutter. This is unlikely to ever change the exposure time unless the Hertz of my electrical line changes
The step wedge is permenently affixed in the machine, so I don't need to worry about getting it in the middle of the field or anything like that.
The Wejex is made by Tobias, who also make the matching sensitometer, so the patches fit easily under the measuring reticle.
The Wejex exposure is ONE SECOND which is closer to the exposure times used in large format photography than the flash duration of the EG&G.
When I replaced the flash tube in my EG&G there was a large increase in output. So the lamp does get dimmer with age (a known effect, shown in the EG&G manual).
There is no Thyrisotor timing mechanism on the EG&G. The flash output is always the result of complete capacitor discharge and the exposure time is related to the time constant of the capacitors and the internal resistance (ESR). I hope mine are still good, as replacements would be difficult to source.
The Wejex has a un-frosted very low wattage bulb that is not likely to blacken like an enlarger bulb. The frosted plastic is just below the step wedge.
The Wejext is timed with a stepper motor and rotating disk shutter. This is unlikely to ever change the exposure time unless the Hertz of my electrical line changes
The step wedge is permenently affixed in the machine, so I don't need to worry about getting it in the middle of the field or anything like that.
The Wejex is made by Tobias, who also make the matching sensitometer, so the patches fit easily under the measuring reticle.
The Wejex exposure is ONE SECOND which is closer to the exposure times used in large format photography than the flash duration of the EG&G.
When I replaced the flash tube in my EG&G there was a large increase in output. So the lamp does get dimmer with age (a known effect, shown in the EG&G manual).
There is no Thyrisotor timing mechanism on the EG&G. The flash output is always the result of complete capacitor discharge and the exposure time is related to the time constant of the capacitors and the internal resistance (ESR). I hope mine are still good, as replacements would be difficult to source.