So today in my photo class....

[Zack]

I found myself in a very interesting argument that i felt i had to share, it goes like this.....

Instructor: What did you enlarge this at?
Me: 15 seconds at f/8
Instructor: Why dont you close down a whole stop to f/16 and make the time 30 seconds
Me: Sir f/8 to f/16 is 2 stops, f/11 is in the middle of those two
Instructor: er oh yeah thats what i ment
Me: and also closing down one stop is 100% less light and doubling the time is 100% more light so thats the exact same amount of light so that wouldnt do anything
Instructor: Nonsense the longer you leave it under the enlarging light the better your contrast
Me: are you sure?
Instructor: im positive

So then i went and did what he said and the prints came out the same.

Just a little comic relief.

Zack

 

[Scarpia]

That's strange; you doubled everything. 😀
Kurt M.

 

[Kin Lau]

How much are you paying for this class?

 

[Dracotype]

He obviously was not a math major. That narrows the field a bit... 😀

Maybe you should explain the exponential nature of shutter and f-stops to him. His brain might malfunction while trying to process it and your class would disband to happier things. :bang: Maybe.

Drew

 

[RML]

Ouch!

Are you paying for that class? 😛

 

[Poptart]

I had a "professor" who quizzed the class about "What are the three types of filters one could use to protect the lens?" The answer: Skylight, UV, and Haze. It took some talking to convince him that UV and Haze are the same filter.

 

[ClaremontPhoto]

The main reason for going for small f stop and long exposure when enlarging is to give more time available for dodging and burning. However, column shake is then an added problem sometimes.

 

[rover]

Jon beat me to it. It will also add to your margin of error as your precentages of exposure will become smaller.

 

[ClaremontPhoto]

No, the percentages of exposure get *more* as your exposure time increases.

Fifty percent of 20 seconds is more than fifty percent of 10 seconds.

 

[Zack]

Since im still in high school it doesnt cost anything, i find that i have to pick my battles, if i tried to call him out on everything he did i would never get anything done. TOday i had to wrestle a squigi aways from him, he didnt understand that since it was old and since most high school kids are careless it was full of dust and dirt. He didnt seem to under stand that this would scratch the film. to solve this problem i just bring a sponge in a zip lock bag

 

[FrankS]

While it is the goal of a true teacher that their students' skills and knowledge eventually surpass their own, this sounds more like a sad case of incompetence.

 

[rover]

No, the percentages of exposure get *more* as your exposure time increases.

Fifty percent of 20 seconds is more than fifty percent of 10 seconds.

I think we are saying the same thing in the end. A 2 second error is a bigger error with a total exposure of 10 seconds than it is with an exposure of 20 seconds.

 

[Little Prince]

Yeah I guess it didn't come out right when you were talking about percentages. Also using smaller apertures allows you to fine tune your exposure by doing more test strips near your correct exposure.

 

[Kin Lau]

While it is the goal of a true teacher that their students' skills and knowledge eventually surpass their own, this sounds more like a sad case of incompetence.

Sounds like a high-school teacher who became the "photography teacher" because he was the only one who actual knew something, not that he was trained for it, or was good at it.

Reminds me of my Auto-Mechanics teacher. The HS was short of teachers, so the teacher from Tech-shop (tech is tech right?.... wrong) who's a welder, and who knew less about cars than most of us did, taught the course. Same thing with my "physics" teacher, who was normally the biology teacher. His grasp of physics was also similarly ...urm.... "inadequate".