Yellow, white tips?

Janine StarykowiczApril 21, 2008

I'm having trouble getting clear shots of entire plants that have white or bright yellow flowers. I can get great detail when I zoom in on an individual flower, but they turn into white or yellow blurs when I try for a wider shot.

Shooting in morning light doesn't help, many of the blooms aren't open yet. I've tried late afternoon, and am learning how to use a polarizing filter. I've almost got enough detail on the magnolias (some blurs, some sharper) using both the PL and UV filters.

What else can I try? I have a Canon Powershot A630.

Here is a link that might be useful: Magnolias

Thank you for reporting this comment. Undo
Janine Starykowicz

Switched to Auto rather than portrait, slightly overcast today. Still not sure if I'm using the polarizing filter correctly, but much, much sharper!

Here is a link that might be useful: Magnolias2

    Bookmark   April 21, 2008 at 2:18PM
Thank you for reporting this comment. Undo

In some of your photos, the camera has focused on a background feature instead of the main subject, for example, the brick wall and the woven fence. In these cases, you may have to resort to manual focus.

The auto-focus technology is not perfect. It follows a set of its own rules and these do not cover all situations. In one case that I know about, the focusing routine (algorithm) looks for hard edges in the scene and adjust the lense to make these as sharp as possible. Thus, the focus routine fails if the central subject is fuzzy. It has difficulty in focusing on fuzzy thistle blossom, but may settle on the leaf edges seen in the near background.

I have another brand of digital camera ( a much earlier example). This had excellent color renidition, but only 2 Megapixel. This one had a particular focuing rule: If it could not find a suitable edge to focus on, it racked the lens to infinity and led one to believe focus had been achieved. This was done to keep the focus mechanism from hunting when the camera was aimed at the sky and or clouds.

Many of your macro shots are lovely, but then an occasional blossom is out of focus or poorly exposed, or does not have enough dynamic range to differentiate between the varying shades of white. Some of the blur may be due to motion of either the camera or the subject, but I did not detect the unidirectional smear typical of a wind blown blossom.

There is a need to increase the depth of field for closeups of the blossoms. This is done by using a small arperature. For floral photography, you can shoot as slow as 1/30 sec with a tripod (highly recommended). Also, a larger len opening, say f/ 5.8, can be used to narrow the plane of focus.

You have a Canon Powershot A630. I have the Canon Powershot S2 IS. There may be some similarity between these models. I was disapointed with mine until after I made a series of test shots. What I discovered was that the dynamic range of the sensor was not as large as I expected and the white to light colored objects were burning out in scenes with significant dark values. The default setting was overexposing a bit. This was corrected by reducing the exposure by 1/3 f-stop. (In my camera, this is not adjustable in the auto mode. Switch to the P (program) mode to make custom adjustments.) The default sensitivity is ASA 80. This results in slow shutter speeds for reduced light. This can be boosted to ASA 100 without much noise effect. In fact, the gain in shutter speed will more than offset any noise increase.

With these adjustments, my shots were much improved. In a few cases when the result is too dark, it can be brightened with processing software. However, if a scene contains a burned out image, no amount of processing can save the picture.

    Bookmark   April 24, 2008 at 4:13AM
Sign Up to comment
More Discussions
Digital or Otherwise?
Have scads of photo equipment based around a Canon...
Lens isssues with cheaper digitals
Looked thru a couple of pages of forum topics for this...
19 most expensive photographs ever sold
Here's a cool article listing (and showing) the top...
Re-introducing myself
Hi my name is Juanita- I got into photography through...
Help with old photos from a Kodak digital camera
I recently found several old floppy discs that I had...
Sponsored Products
Antique Rose 3-piece Quilt Set
The Pillow Collection Luthien Stripes Pillow - Pink Green - P18-WAV-PATIOSTRIPE-
$71.99 | Hayneedle
Aqua & Yellow Polka Dot Ruffle Apron
$19.99 | zulily
Runner Rug: Aledo Beige 2' 6" x 8'
Home Depot
Ilene Yellow 18 x 18 Coastal Throw Pillow
$57.95 | Bellacor
Contemporary Indoor/Outdoor Accent Rug: Mohawk Home Rugs Yellow Springs
$15.97 | Home Depot
Darya Rugs Oushak, Yellow, 10'3" x 13'8" M1785-1
Darya Rugs
Golden Buffet Golden Bronze Table Lamp
Lamps Plus
People viewed this after searching for:
© 2015 Houzz Inc. Houzz® The new way to design your home™