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Fresnel Help
Old 01-30-2006, 08:25 PM   #1 (permalink)
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I recently picked up an old stage light from an antique store here in Nashville. (Sorry Larry and Shannon) It's got an 8" lens on it and barn doors, but came with about a 1000 watt(my guess) bulb with a 20 amp 120v plug on it. I modified an old Sylvania Sun Gun to replace the existing socket and wiring. The SunGun came with a 600 watt bulb, but that didn't last long.It wasn't very durable and broke the first time I tried focusing it, but it was extremely bright. I replaced it with a 150 watt halogen from Lowes and it seems to work pretty good.

Here's probably the best from my first time shooting with it.......



I realize it should be at a higher angle, but since this thing is so heavy and I can't mount it on a stand yet, I just layed it on a box.

My first question is....If you look at her chin the shadow actually has many edges to it. I was holding up a small box to create the shadow. Is this created by the ridges on the fresnel lens? If so, will they dimnish if the light is farter away from the subject? In this case the light was only about 5 feet away. When using Gobos are they normally close to the subject?

Second question (or third [img]/ubbthreads/images/graemlins/confused.gif[/img])... I know many of you have modified yours to use strobes, but for those who use Hot lights, What size bulbs are you using? When she first looked at the 150w she was having trouble squinting, I know the 650w will give me a faster shutter speed but it may be real uncomfortable for the model. I am going to put a dimmer in the circuit to cut that down some and maybe increase the life of the bulb. By the way, my studio space is only 9x12.

Joe


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Re: Fresnel Help
Old 01-30-2006, 09:50 PM   #2 (permalink)
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[ QUOTE ]

My first question is....If you look at her chin the shadow actually has many edges to it.

[/ QUOTE ]

If you mean where I have drawn the red lines here, it looks like banding caused by the fact that you olny have 256 steps in your grey scale. Try processing the picture in RGB mode.



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Re: Fresnel Help
Old 01-30-2006, 10:16 PM   #3 (permalink)
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Not sure what you mean when you say process it RGB, it was shot B/W in camera. Also that shadow is the only one that causes the multiple edges?

Joe [img]/ubbthreads/images/graemlins/confused.gif[/img]
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Re: Fresnel Help
Old 01-30-2006, 10:24 PM   #4 (permalink)
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[ QUOTE ]
Not sure what you mean when you say process it RGB, it was shot B/W in camera. Also that shadow is the only one that causes the multiple edges?


[/ QUOTE ]

Hmm, shot B&W in the camera. That limits your options. Do you have any image editng software? If so, which program?

I'm still convinced it is not caused by the fresnel lens.

Are you able to email me the original picture out of the camera and I'll be able to get a better idea of how to fix it? Do you mind if I post the result here?

-Mike
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Re: Fresnel Help
Old 01-30-2006, 10:32 PM   #5 (permalink)
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Mike,
Check your Email in a bit

Joe
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Re: Fresnel Help
Old 01-30-2006, 11:49 PM   #6 (permalink)
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Joe,

What store did you find such a cool light at?

Looks like you're getting help with the banding issue there. As for wattages I used hotlights for about a year before I went with the bees. I had a three light jtl setup, each light was five hundred watts. You can do some cool work with hot lights but you tend to wilt people pretty quickly [img]/ubbthreads/images/graemlins/smile.gif[/img]

I still have all three of the jtl heads and some spare lightbulbs. If you're putting a hot light kit together I'll make you a seriously good deal.

BTW, I'd still love to hook up and do some shooting out your way. I stopped in to the veterans cemetery we were talking about one morning and got a couple of shots.

Here's one:




Good luck with the new light

Shannon
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Re: Fresnel Help
Old 01-31-2006, 12:11 AM   #7 (permalink)
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Ok, I've looked at the big picture.

It's possible to see how the banding is caused by quantization if you open the brightness/contrast dialog in your editing software and adjust the brightness. You will see the bands move as you do it.

I tried using curves but the picture deteriorates faster than the banding improves.

The only thing that I could get to help was adding a lot of grain but that also changes the feel of the picture significantly. I think a reshoot in colour is the only real option here and do the B&W processing in post.

-Mike
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Re: Fresnel Help
Old 01-31-2006, 01:12 AM   #8 (permalink)
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Love that cemetery shot. Very nice.

Allen
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Re: Fresnel Help
Old 01-31-2006, 05:34 PM   #9 (permalink)
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I actually got it from an antique store just off 65 near the fairgrounds exit. It was buried under a bunch of stuff, so I just left it for about 3 months. Went back and it was still there, so I nabbed it. Seams like too much work to convert it for my Alien Bee, unless someone has an easier idea then I can come up with.

Yeah, I figured you could get some good fog shots out there at the cemetary. Timing is everything, but it looks like you nailed it. I tried one morning at the one off Gallatin Rd, but I didn't get anything worth writing home about.

We'll have to pick a weekend sometime and get together.

Joe
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Re: Fresnel Help
Old 01-31-2006, 05:37 PM   #10 (permalink)
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Thanks for your help Mike,
Looks like a reshoot in RAW and post process it. B&W may be a limitation of my camera, I guess we all can't be like JT [img]/ubbthreads/images/graemlins/frown.gif[/img]

Joe
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