Potpourri starting Dec 14, 2009

a1gutterman · Post by **a1gutterman** » Thu Dec 17, 2009 11:36 pm

charlese wrote:I have been quiet about football all season long - Now have to post that tomorrow, Dec. 18th, the 2009 NCAA Division I finals (National Championship game) will be held in Chattanooga, TN. Kickoff at 6:00 MST

Featured will be the Montana Grizzles (14-0) VS the Villanova Wildcats (143-1). Cannot say Go Cats!

GO GRIZZLIES!!!!

Can knot say that I follow the football scene, college or pro, but that record looks like it is a little wrong. If it is correct, I can see why Dusty is so proud to support them!!!:D

nomoman · Post by **nomoman** » Fri Dec 18, 2009 2:06 am

charlese wrote:Yes it does! and also brings on premature graying - as well as face making!

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What do you have in the lathe? A ham hawk??? Looks like roast beef??

cocacola1012 · Post by **cocacola1012** » Fri Dec 18, 2009 2:10 am

charlese wrote:Yes it does! and also brings on premature graying - as well as face making!

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I like when you guys post pictures of your shops. It give me some ideas for mine. That hose doesn't look like it is catching many of the shavings..

mickyd · Post by **mickyd** » Fri Dec 18, 2009 7:57 am

nomoman wrote:What do you have in the lathe? A ham hawk??? Looks like roast beef??

I'll wager a 'burl'. google it.

mickyd · Post by **mickyd** » Fri Dec 18, 2009 8:58 am

I googled "world's largest burl". Over 6 feet.
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JPG · Post by **JPG** » Fri Dec 18, 2009 6:48 pm

mickyd wrote:Here's my take from scratch. A camera lens utilizes a focal 'plane' (vs. point). The cameras 'sensor', whether it is film or the digital sensor has to be located at the exact focal plane of the lens in order for the image to be in exact focus.

Lens magnification puts down the exact same size image on the 'sensor' (film or digital) as shown in the left and center view, since both need to be on the focal plane. With most consumer cameras, the digital sensor is physically smaller than the 35mm film so in effect, the 'field of view' is less. To get the digital shot on the right to equal the size of the 35mm film on the left, you have to magnify the image ~1.6 times but will VARY based on the specific camera.

This shows the effect:
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Now whether or not we were saying the same thing, who knows. Language can be a complicated thing.

You be Correct re sensor IN the focal plane(same distance as full frame sensors). All I said re 35mm.'digital small frame cameras' is IIRC correct. Any cornfusion is relative to the 'meaning' of the focal lengths for each 'type'.

Informed explanation would be appropriate here from somebody who 'Knows'.

charlese · Post by **charlese** » Fri Dec 18, 2009 7:26 pm

nomoman wrote:What do you have in the lathe? A ham hawk??? Looks like roast beef??

Glad someone asked! I was turning a Banksia pod. The little pieces of those pods fly everywhere. There is no controlling chips like you can with normal woods. That's why I'm wearing glasses and have my mouth closed.

cocacola - What you see on the end of the dust collector hose is one of the Shopsmith small floor sweeps. Held in place with a length of 10-3 underground wire. This works great for sanding, but is only partly successful in this case. Months later I am still finding small Banksia shards on shelves of the shop.

Banksia can be purchased from Rockler and other sources. Look up Banksia on the internet - interesting!

Here's a photo of a previously finished Banksia piece. Won't hold water, but will hold a weed or flower display.

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Here's the one you saw in the above picture, getting some poly finish.
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Here's after drilling the vase hole in the pod.
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Didn't mean to say I had receding hair, but before I bought the Shopsmith my hair was coal black and wavy. Mike had asked if woodworking causes hair to recede. My answer is Yes! - and other things! After a few years of woodworking, Hair changes DO occur! The combination of woodworking and time must cause these changes!]6995[/ATTACH]

charlese · Post by **charlese** » Fri Dec 18, 2009 11:16 pm

Final sore - Villanova, 23 - - Griz 21:( But the boys can't be too sad at 14-1 record. and playing in the National Championship games in two successive years.

mickyd · Post by **mickyd** » Sun Dec 20, 2009 9:43 am

mickyd wrote:Point and shoot vs. photography......For you point and shooters, there actually IS a correct answer to this question based on these facts.

Details needed to answer the poll question....

Bright sunny cloudless day, August 21, 2010, high noon, your in the middle of a field of lawn turf in Flagstaff, Arizona. You want to photograph the field and sky with a wide angle landscape shot with the blue sky horizon in the vertical center of the view finder. You want to under expose your photograph by 2 f-stops. Your film speed is ISO 400, your lens is a 28mm wide angle. Your shutter speed is 1/500th of a second. Your wearing size 10 red sneakers and a medium baseball cap.

Your cameras exposure meter isn't working and you don't have a light meter either. What will you set the cameras aperture at to under expose your photo by 2 f-stops? (I'm at lunch with too much time on my hands, bored stiff!!)

P.S. I tried to make the question non-googleable!! I will now go out and see if I can google the answer

Here's the answer and how you get to it......

The foundation:
Photographies "Sunny f-16 rule" says "On a sunny day, set aperture to f/16 and shutter speed to 1 divided by the ISO film speed."

So....with ISO 400 film

sunny f16 and 1/400th shutter = 0 f stop (correct exposure)
this example 1/500th shutter would be 1/4 f stop underexposed since shutter speed is 1/4 faster than the sunny f16 rule recommends. 1/4 f stop is close enough to being considered negligible so it will be ignored.
To underexpose by 1 f-stop, aperture would be 1 f stop smaller than sunny f16 rule or f22.
To underexpose by 2 f-stops, which was the question in the example, the aperture would be 2 stops smaller than sunny f16 rule or f32

Easy, huh?

iclark · Post by **iclark** » Sun Dec 20, 2009 3:01 pm

mickyd wrote:Here's the answer and how you get to it......

The foundation:
Photographies "Sunny f-16 rule" says "On a sunny day, set aperture to f/16 and shutter speed to 1 divided by the ISO film speed."

So....with ISO 400 film

sunny f16 and 1/400th shutter = 0 f stop (correct exposure)

this example 1/500th shutter would be 1/4 f stop underexposed since shutter speed is 1/4 faster than the sunny f16 rule recommends. 1/4 f stop is close enough to being considered negligible so it will be ignored.

To underexpose by 1 f-stop, aperture would be 1 f stop smaller than sunny f16 rule or f22.

To underexpose by 2 f-stops, which was the question in the example, the aperture would be 2 stops smaller than sunny f16 rule or f32
Easy, huh?

aww - you knew that somebody would quibble:D

I think that the sunny 16 was a rule of thumb for general landscapes. setting things up so that you have nothing but flat field of grass out to a haze-free blue sky horizon means that you will need a bit more light for proper exposure. since you already kicked in 1/4 f-stop with the shutter speed, it only takes another 1/4 correction to the general rule to make it equally correct to say f22 or f32. if you are looking toward the dark side of the grass (due to breeze or phototropism), then f32 would be 3 stops or more under exposed.

of course, put one of farmer's tractors in the mid field and my quibbles gets plowed right under

thanks for getting me to remember some old photo techniques.

Ivan

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Potpourri starting Dec 14, 2009

What is the aperture for -2 f-stop exposure compensation? (read post #39)