Michael Althaus
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Posts posted by Michael Althaus
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One more example: A shutter speed chart lists that 1/1600 (0.000167) is 2/3 stops less than 1/1000 (0.001).
A full stop less would be 1/2000 (0.0005). I would therefore expect that the steps would be as follows:
Full stop under: 0.0005 s (1/2000)
2/3 stops under: 0.00067 s (1/1500) (Charts say 1/1600)
1/3 stops under: 0.00083 s (1/1200) (Charts say 1/1250)
No correction (base exposure): 0.001 se (1/1000)
Why is the scale on the chart not linear...
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Maybe I'm overcomplicating this and there is a really simple answer. This has been bothering me for awhile but I never really tried to find out:
Example:
Lets say my base exposure is 1/1000 = 0.001 seconds
If I want to underexpose by a full stop, I would expose for: 1/2000 = 0.0005 seconds
Therefore 1 stop underexposed means that I expose for 0.0005 seconds lessSo far everything seams logical.
However, let's just say I want to underexpose by 1/3 stop: So... if 1 stop under exposure is 0.0005 seconds less, I would expect that 1/3 stop less equals 0.000167 seconds less (0.0005/3)
Therefore, the exposure time would be 0.000833 seconds (0.001-0.000167) which is 1/1200 second.However, every shutter speed chart lists 1/1250 seconds for 1/3 underexposure (base is 1/1000).
How come?
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New and factory sealed. All rolls have been stored in the fridge or freezer at all time. I need to free up space, so I'm selling them. The 5329 Roll was bought about a year ago, the other rolls are less than a year old...
Asking $850 OBO
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Selling my mint condition DSLR rig. Pictures are of the actual item. Everything works perfect and is rock solid!
I will ship fast.
Free Priority Shipping.
Pay with Paypal.
Pick-up possible (PM me).
All Sales are final.
Asking: $489
more info about this type of rig can be found here: www.cordvision.com
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Can somebody tell me the exact type of material that is used for lens caps of this type:
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Hello everyone,
I am looking to buy one Beaulieu 4008 ZMII super 8mm camera with good condition. I am based in the London area.
Does anyone know places to get one in the UK apart from ordering one online?
Any comment would be grateful!
Thanks!
How much are you looking to spend? I would still have a Beaulieu 6008 that I might sell for the right price...
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Here are some pictures: http://gallery.me.com/moldhouse#100319 :-)
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Selling Zacuto Universal Baseplate V3 including 7-inch extension rods. Everything is in great condition (by the way, Zacuto has a lifetime warranty on their products). There are some scratches on the know, and bottom/top of the baseplate (just cosmetic). If you are interested, let me know, and I can snap some pictures of it. Selling because I can get all the equipment I need from school.
Asking for $430 plus shipping. Whoever is first takes it! Payment through PayPal (only ship to confirmed US address).
New Price Baseplate: $560 (http://store.zacuto.com/universal-ba...inch-rods.html)
New Price 7-inch Rods: $70 (http://store.zacuto.com/7-inch-rod-extensions.html)
New Total Price: $630
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I'm looking for as much info as possible on Jeff Cronenweth. Already looked at his wiki site, imdb, and read this interview (http://www.moviemaker.com/cinematography/article/the_power_of_the_fluid_camera_2759/). Does anybody have more info about him? I'm preparing for a little presentation about him and his cinematography (with an emphasis on his work in Fight Club). Any input is greatly appreciated...
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Thank you for all your replays. I ended up using the spot meter of an SLR camera. I was a little bit worried because I was shooting reversal film, but it turned out fine :) It's just awesome having a community available that knows an answer for pretty much everything...
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How would you use an incident light meter (don't have a spot light meter available at the moment) to expose correctly for something that emits light like neon signs/ads or a light bulb etc.?
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Very good idea,
I recomend to draw attention on Kinor-16 SX-2M.
The many filmmakers change of K-3 on Kinor-16 SX-2M.
After a first shoots with K-3, you will have request to use of wide angle lens,
after, you will wish to install of electrical motor,
after, to install of crystal sync electrical motor,
after, to ask about 120 m film magazine.
Actually, I bought the camera because it doesn't have all these things. I have access to Arri SRII's from school (Chapman) if I need these "features". The thing about the K-3 that was so intriguing to me was the fact that it was small and that I didn't need to worry about batteries etc. I use the camera just to shoot little shorts in my free time, for which it should be more than good enough. Thanks for all your good answers!
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Thank you for all the advice. I might just buy another one. I only spent
$100 on it so it is not too much of a loss...
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I just got a K-3 and found out that the mirror is very badly scratched. It looks as if somebody used sand paper on it. As a result the viewfinder is relatively dim and all highlights have a glow surrounding them. I am aware that the actual image recorded on film isn't affected by this but nevertheless would like to fix it. Is it save to remove the screws that hold the shutter and take it out to polish it? Will I have problems putting it back in, and aligning it? Any advice that would be useful when doing this? Thank you...
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Price: $2895!!!
NEW Chrosziel 203-1 Studio Follow focus as you can buy on bhphotovideo.com for $3,699.95 --> (http://www.bhphotovideo.com/c/product/4589...llow_Focus.html). It was never used and comes in NEW condition.
-Retail price $3,699.95
-The 203-01 follow focus is designed for film and video cameras
-The 203-01 system allows easy operation from both sides
-The 203-01 can be fitted with a focus knob on both sides, giving the system added flexibility
-Markings on the focus wheel give about 110-140 degrees of rotation on the lens
-Made in Germany
If you have any questions, don't hesitate to contact me.
Local inspection in a public place in Santa Monica is possible.
All sales are final.
Buyer pays actual shipping costs (no additional charges). I also ship international, ask me for shipping and insurance costs.
I only ship insured unless the buyer takes the risk of damage or loss etc.
If you pay through paypal, add paypal fees to the price.
If you need references: Some users on this board know me personally, pm me for their username....
pictures here: http://gallery.me.com/moldhouse#100240
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New, never used Chrosziel Studio Follow Focus 203-1 for sale.
Asking price: $2995 + shipping and paypal (BHphotovideo sells it for $3699).
Would prefer to deal locally (Santa Monica).
PM if you have questions....
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SOLD!!!
Price lowered to 360 USD!!!!!! -
Price lowered to 360 USD!!!!!!
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I have a mint condition Sekonic DualMaster L-558 CINE for sale. It was only used once on a test shoot. Carrying "case" is included. Inspection or pick-up in Santa Monica is possible.
Payment: Cash on pick-up or Paypal
Shipping: USD 10.- (Shipping to the lower 48 states)
Asking Price: USD 400
Feel free to PM me if you have questions....
Quick Guide: http://www.sekonic.com/images/files/L-558_Quick_Guide.pdf
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is there an adapter available to use contax lenses on a eclair acl?
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Can somebody tell me if the Arriflex Lightweight Follow Focus ( http://gallery.me.com/moldhouse#100176 ) works with an Aaton XTR?
Thanx...
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I am selling another Arriflex Follow Focus. You can find the auction here -->
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewI...em=260294853726
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With the help of this page ---> http://www.panavision.co.uk/services/ (DOF and FOV calculator) you should be able to figure out the answer to your question (sorry, I was too lazy to go through it).
Why are shutter-speed calculations not linear?
in General Discussion
Posted
Thanks for the replies
@Nicolas POISSON
Thanks for all the details and math, I really appreciate it.
I'm aware of how it works in practical terms (I've been shooting video and some film for over 20 years). I just never actually thought about the math behind "the numbers" and didn't realize the obvious issue you get with mixing a linear and log scale. I guess my question actually comes down to why the logarithmic scale applies and not a linear scale. Does it have something to do with how film reacts to light?
Looking at your formula, I just realized that the change is always by a factor of the cube root of 2 (3√2 = 1.2599). In other words, one step up, is 26% more than the previous value (Example: 100 to 125 to 160 to 200... numbers are rounded). This applies to the shutter-speed, ISO, and the calculated area of the entrance pupil (using the unrounded numbers like f/1.41421 for the calculation). It is quite obvious if you think about it... just never really thought about it in that way (just knew the numbers by heart but never really why they are what they are).