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Tech Tips

Tech Tips

OP Expert George Lepp tackles your technical photography questions in Tech Tips.


Monday, October 29, 2007

The Focal Lengths Of Macro

I want a macro lens, but I don’t know which to choose. I see that there are three sizes available from Canon: 50mm, 100mm and 180mm. Which is best?

Monday, October 22, 2007

Blue/Gold-Gold/Blue

A friend told me about a polarizing filter that imparts color to the image. Where would you use this kind of filter? Does it make sense to use a filter like this if you’re photographing in digital and can add color in Photoshop?

 

 


Monday, October 1, 2007

ISO & Digital Image Quality

Lowest ISOs • Blowin' In The Wind • Stacking Tele-Extenders • Performance In Cold Environments

I’ve noticed that many of the Nikon cameras, such as the D100, have a starting ISO of 200, while Canon digital cameras start at ISO 100. Is there a difference?
Sal
via the Internet

Saturday, September 1, 2007

Memory Card Sizes

Is Bigger Better? • Windows Or Mac, One More Time • Full-Frame Dust • Preserving RAW Files

I’ve been shooting with a 10.2-megapixel digital SLR for a few months. I have two 4 GB CompactFlash cards. As I go on safari, I’ve considered getting a couple of 8 GB cards so I won’t have to change and download so often when doing a lot of shooting. Now I’m hearing the 8 GB cards aren’t as good. If this is a fact, what’s the problem?


Saturday, September 1, 2007

Landscape Lenses

Focusing On Focal Lengths • Cave Photography • What You Should Bring • Tilt/Shift Lenses For Landscapes

One of the questions asked most frequently at my seminars is, What’s the most desirable focal length for landscape photography? I always answer that I use all focal lengths, and I tend to use the extremes—long telephotos and extreme wide angles—quite often. It’s all about perspective. If we can show the scene to the viewer in a different way than they see it on a day-to-day basis, there just might be a reason for them to look at our pictures.

Sunday, July 1, 2007

Lenses For Panoramics

Perspective Control In Panoramics • Tripod Shopping • Megapixel Printing • Is What You See, What You Get?

I’m interested in trying panorama landscapes. In a class I recently took, the instructor said that the only way to get a good panoramic landscape is to use a PC (perspective control) lens. It’s a lot of money! Is there another way?
Participant at Photoshop World
Boston, Massachusetts



Monday, June 25, 2007

Digital ISO

How does the ISO setting affect the results in digital capture? My objective is to create a good-quality 16x20 print. Let’s say there’s no movement of the subject involved. How would the image look at ISO 100 compared to ISO 400?


Monday, June 18, 2007

Protection In The Field

While looking at the way plastic food wrap clings to just about anything, it occurred to me that this is a great way to protect one’s camera from the rain. It’s thin enough to allow normal operation of the switches and buttons.

 

 

 


Tuesday, June 12, 2007

Panoramas And Image Perspective

Why should I take a series of pictures and go to all the trouble of splicing them together in a computer to make a panorama, when all I have to do is take the photograph with a wide-angle lens and crop the top and bottom?

 

 

 


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