Bellows Extension Factor

Рет қаралды 1,290

3 ай бұрын

In this video I explain four different techniques to determine bellows extension factor.
Filmed on the Canon R5C.
Quick Disc: www.salzgeber.at/disc/
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Пікірлер: 24

@Nat.ImagesLarge.F.Photographer 3 ай бұрын

Tony thank you very much, excellent tutorial,great contribute for the community of Large Format Photography!!!!!

@tonysantophotography 3 ай бұрын

Thanks Nat! I appreciate your continued support!😎

@Philippsalzgeber 3 ай бұрын

Last year I created a plastic version of the quick disc, and am in the (slow) process of making a video about it - what a coincidence, that you mention the original quick disc in this video! For a long time I thought, that it is obsolete, but the resurgence of film photography over the last years, made me think about the quick disc again!

@tonysantophotography 3 ай бұрын

Wow! How cool! It’s great to have you here Philipp! The creator of the Quick Disc! It’s an honor. Thank you for taking the time to watch! 😎

@NothingTooSpiffy 3 ай бұрын

Thank you for making these videos Tony.

@tonysantophotography 3 ай бұрын

My pleasure! I appreciate you taking the time to watch!😎

@mcroman-superfeat Ай бұрын

THX a lot for sharing this ...

@tonysantophotography Ай бұрын

You are very welcome! Thanks for your support . 😎

@andyvan5692 3 ай бұрын

thanks Tony, a great explanation of the concept, and tools to use to use; fyi sinar had a "pen" style quick disk system that not only did this, but calculated macro magnification at the same time.

@tonysantophotography 3 ай бұрын

Thanks Andy! That’s good to know. I’ll have to search for one. Thanks for your continued support. 😎

@DFish111 3 ай бұрын

There's also the f-stop method, where the lens focal length represents the baseline f-stop, and the bellows extension represents the delta f-stop. In your example at the 15:55 mark, your 210mm lens would be f/21 and the 457mm bellows length would be f/45, which is a difference of just over 2 stops. It's not difficult to find or make a chart of the less common f-stop numbers and their relationships to the ones we're accustomed to seeing on our lenses. I suppose it's a close-enough-for-government-work logarithmic approximation. Thanks for the videos. You look a bit like Alex Honnold's fun uncle.

@tonysantophotography 3 ай бұрын

Thanks for sharing! I wasn’t aware of that method. I”ll have to take it for a test drive. Thanks for your support!😎

@kosumi001 3 ай бұрын

using inches instead of mm will be easier to figure out the f-stop relationship :)

@jamesbarnes3063 3 ай бұрын

Thank you

@tonysantophotography 3 ай бұрын

You are most welcome! Thanks for watching!😎

@chriscard6544 3 ай бұрын

I always have a metric ribbon with me. After this video, I wont need any app anymore. It's easy actually.

@tonysantophotography 3 ай бұрын

Glad to hear it! Thanks for taking the time to watch! 😎

@johnkawooya8421 2 ай бұрын

Tony, good job! I love your humorous presentation style. You are able to simplify complex tech. problems for "ordinary Joe's" understanding. Have you ever considere commercializing your skill set through a recorded online masterclass in large format photography?

@tonysantophotography 2 ай бұрын

Thanks John! I appreciate your support! 😃

@funghoifungjason9036 3 ай бұрын

My Prefered Method to use a tape measure using inches. Lets assume you know the common f/stop numbers F4, 5.6, 8, 11, 16, 22, 32, 44, 64 etc... 1. Convert your lens into inches. (i.e. 11.8 inches. I would tell myself 11 inches and a bit - no need to be percise) 2. Measure my bellows (i.e 21 inches.) 3. Use the inches to measure the differences in stops. about for the 11.8 inches and 21 inches, it is about a stop and a half. I use a stop and a half of exposure compensation. If I don't mind over exposing, I might just increase it by 1 stop. Question: Is there a way to we calculate the maximum possible bellows length? i.e How do we get the smallest subject to lens distance? And based on lens to subject distance, how do I calculate the length of the bellows?

@tonysantophotography 3 ай бұрын

Thanks for sharing your clever way of determining BEF! In my experience, you can get the lens really close to the subject, within just a few inches. The limitation will be the amount of bellows your camera has. There probably is a formula for determining what you are asking but I am not aware of it. Sorry. Thanks for watching!

@ericholmquist8966 3 ай бұрын

Screw all the math, Tony, where'd ya get that Swedish Road Runner? I'll trade you for a regular chicken.... I'll carve and paint it custom, ya shore ya betchya.

@tonysantophotography 3 ай бұрын

LOL!😂 I appreciate your support! 😎