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Condition: Excellent
Sangamo Weston Meter Invercone in case for Weston IV
supplied in excellent condition
General Sangamo Weston Information
This little chunk of white plastic which doesn't quite seem to fit is in fact an extrordinary piece of design which has made the Weston the most accurate incident light meter in the world. The inverted cone shape is designed so that as the meter is angled to the light source, the readings remain accurate which they would not do if it were a dome. And because backlight effects the exposure, a small part of the invercone sticks-out beyond the top of the meter case to pick any such light up. Inspired design or lucky chance - your decision! Only problem is that you can't see the dial if you hold the meter with the invercone towards you as you would do if the light is coming from behind you - which it often does. The first meter to use an invercone is believed to be the Weston II. The top picture shows a Weston IV with it's original invercone which by then had become a more bulbous affair. The next picture down shows original model that came complete with a nutral density filter that was needed as the baffle could not be closed with it on. A similar invercone but without the "star" shape was made for the Master IV and later models.
Now, some history
It seems that the first commercial incident light meter was the Avo-Smethurst incident meter: This meter used a flat diffuser over the normal light-sensitive cell. This was fairly successful in front-lit situations but poor at other lighting angles. In the US, the Norwood Director exposure meter (later known as the Brockway and eventually as the Sekonic) was an early and successful attempt to solve both motion picture needs and side-lighting problems. This meter was held in wide regard and used by most professional cinematograhers. The Norwood was designed for incident light measurement and used a translucent hemisphere over the meter receptor cell. The hemisphere is actually a three-dimensional model of 'real world' objects, light reaching the inside of which is used to estimate exposure. The performance of the hemisphere is said to be 'compensating' because it integrates light received from a multitude of directions associated with both the main light and fill-in sources. The Brockway and it's later variants also came with a flat diffuser for incident readings.Exposure estimation was particularly difficult in back-lit situations even with this otherwise excellent meter.
Meanwhile, back in the UK, in 1957 it was shown that in theory a better exposure reading could be obtained using back-leak compensation (BLC) and a Mr D Connelly, of Sangamo Weston, brought it to reality. The earlier invercones were much flatter devices than the later ones and therefor less effective.
Camera House Price: £5.00
The Sangamo Weston Meter Invercone in case for Weston IV is shown in Accessories.
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Delivery will be made by Royal Mail, you will be able to track your order online to find your scheduled delivery date. Any deliveries scheduled to arrive on the Saturday or Bank Holiday will be delivered the following working day. We aim to dispatch your order within 24 hours of the time the order has been placed.
Looking after your camera
Use a Camera Bag
A camera bag does more than just protect the camera against scratches and dust: It keeps it safe from rain because many are waterproof on the outside.
Be Very Careful Around the LCD Screen and Camera Lens
Use only special equipment to clean your camera’s LCD screen and camera lens. Buy a special cleaning kit that includes liquid solutions, microfiber cloths and brushes that have been specially designed to clean your camera lens.
Never Leave Your Batteries in Your Camera for Too Long
Many camera batteries are now alkaline or lithium formats. If you keep your camera with the batteries inside of it in a moist area, then the batteries can get corrosive. So if you’re thinking about just putting your camera on the shelf for several months, do yourself a favor and remove them.
Turn Your Camera Off Prior to Doing Anything
Before you do anything to your camera, always keep in mind that it should be turned off first. No matter what it is—swapping lenses, changing memory cards or disconnecting or attaching cables—your camera should be turned off.
Cold and Wet Weather Can Wreak Havoc on Your Camera Body
Take your camera out only in a waterproof bag. If the weather’s unusually cold, just wrap your camera in a plastic bag that has silica desiccant packets for the reduction of moisture. It’s also a smart idea to have a soft towel with you to wipe off any moisture, just in case it should get on your camera.
Good Memory Card Care Is Good Camera Care
Only transport your memory cards inside of a protective caseMake sure the memory cards stay dust-free at all times. When removing memory cards, make sure you do so indoors or in non-dusty situations.
Make sure that you keep memory cards only in cool places. Never keep them in places where they may heat up, like dashboards or glove compartments.
Never place your memory cards close to magnetic sources. Examples of magnetic sources are things such as audio speakers, TV monitors and actual magnets.
Use a Filter to Protect Your Camera Lens
The lens of your camera is naturally fragile. As such, it’s susceptible to scratches, cracks, dents…you name it. A UV filter will not only will you give your lens a fighting chance, but you’ll also enhance the quality of your pictures.
Condensation Can Be Controlled
Condensation normally happens when you move your camera between different temperatures.
Allow your camera a chance to naturally get used to the hotter environment. Don’t place it inside a closed plastic bag when transporting it between different temperatures! Just let the camera sit in the humid temperature for a while, until condensation disappears.
If this still doesn’t get rid of all of it, you can utilize a soft cloth to wipe away any remaining moisture and marks left behind from the condensation.
