Put the wide angle lens hood, open the camera back, set to lens to the largest aperture, set the shutter to 'B', open the back, fire the shutter and hold it open. Then look through the back of the lens and search the corners for vingetting.
Check to see if there is any lens cap information at Hasselblad Historical www.hasselbladhistorical.eu/HS/HSTable.aspx My Hasselblad 500mm C lens came with the gray cap. I will check the serial number to determine when it was made.
That happens to me with Nikon AF SLRs too. They just know. Maybe because their lives depend on sensing and reaction to dangers. We do have eye that are lined up in parallel and that marks us as carnivores.
There are standard light sources and standard calibration processes. That does not include a unique ISO standard K value. Some light meters, CDS, were more blue sensitive than non CDS meters, hence no specific K value.
It turns out that a friend had inherited an older version from a friend and he sent it to me. It is comfortable with a large lens mount by its foot to the chest paid. The lens is about 8" long and it is comfortable to carry, disconnect and shoot and reattach. It now has a waterproof lens...
I purchased the Micnova GPS-N PLUS device from Amazon and while the webpage said that it is compatible with the Nikon Z7ii, it is not and I returned it.
I reinvented myself as an engineer many times. In photography it was not so much as reinventing myself as learning new skills, using new types of equipment and going back into the darkroom again after over 60 years.
With film one can only use filters to change the response: blue filter with white flash bulbs for daylight film and orange filters for tungsten film in daylight.
Now with digital cameras have the capability to set to White Balance to: Sunny Bright, Daylight, Cloudy, ... and alter the response...
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When I take wildlife photographs I noticed that herds and flocks know a lot about photographic equipment. They take one look and note the brand of equipment and the lenses. Then they move way from me to a distance at which I can only get photographs of large groups and...
The spectral ranges of films, color slide, color print and black & white are available on the manufacturers' data sheets.
The spectral ranges of light meters is available also from the manufacturers' and can also be found on line by type of sensor.
The spectral ranges of digital cameras are...
I either use bounce flash or a plastic diffuser that came with my flash. Either of those will cut the unwanted harshness from the closest people without impacting the exposure as I use the flash's sensor for exposure control.
I have been using XTOL and replenished XTOL for over 10 years. Both stock and replenished keep for well over a year [stock for at least 3 years] if it is stored without any air and tightly sealed. Accordion bottles will eventually leak. I use StopLossBags™ to get those times in the second...
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