mdorn wrote:
I enjoy shooting landscapes, but often struggle with focus. Some will recommend shooting at the smallest aperture possible (i.e. f/22 or higher), and others will recommend not going over f/16 and focusing about 1/3 into the frame. I've done it both ways with inconsistent results, so I'd like to hear what others do. I'd also like to hear from those who use exposure "stacking" to maximize DOF. I'd love to see an example of this if anyone has experimented with it. Thanks.
You are shooting digital... Hmmm?
So pay some attention the the Low-Pass filter (AA filter) technology changes taking place.
Strong AA filters in digital camera's have been used to reduce the instances of "Moire" patterns in images. The down side is that a strong AA filter smears detail in images, which appears at first glance to be diminishing sharpness.
Some camera manufacturers' are currently tackling this shortcoming of strong low-pass (AA) filtering/lack of sharp detail, with efforts to install weaker such filtering, or remove the filter altogether.
The Nikon D800E is using a dual system wherein the low-pass filter strength is essentially neutralized, hence some increase in detail sharpness (ie less smearing of detail).
Olympus took the first good crack at using a weaker AA filter when they introduced the PEN E-PL1 (their 3rd or 4th PEN). It was not highly advertised and I read an obscure article about this weakening of the AA filtering.
I immediately purchased and E-PL1 and was rewarded with great sharp, or apparent sharper focus. Have had an E-PL1 since and going to purchase the 16Mp Sony sensor E-PL5. Olympus has retained the weaker AA (Low-Pass) filtering in the OM-D EM-5s, and subsequent PEN's, which is just one of the reasons the EM-5 captured Camera of the Year for 2012 at DPreview.
The $600 E-PL5 PEN has the same sensor and configuration of filtering the anti-aliasing.
I recall reading that both Sony and Pentax are experimenting with removing the AA filtering altogether on some new models.
It's coming to light that "moire patterns" are easier to correct in Post Processing and does not occur in all images, while sharpening is more work and must be done on every image, as the AA filter does not discriminate. It filters every image from camera's where it is installed and may be a bit too strong.
I've always been a bit frustrated at the money and energy the camera manufacturers have put into the megapixel race, High ISO, and Video in primarily Still Cameras, and not attacking the sharpness issues by overlooking the low-pass AA filter problems.
So it may add a bit more to the mix, if one considers that part of the problem may be behind the lens, but in front of the sensor, the low-pass or AA filter.