JONATHAN JK

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Posts Tagged ‘Depth of Field

SIGMA 24-70, HSM F2.8 REVIEW PART 3 (Depth of field)

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Depth of Field

Canon 24-70 L vs Canon 24 f1.4 L vs Sigma 24-70 (Quick note)

All these images are from unedited raw files. They show all these lens depicting as much of the same scene as possible for an accurate as possible comparison. I’ve organised the gallery to show the Sigma lens on one side and the Canon version on the other. At the bottom is the Canon 24mm L images just for comparisons sake.

 

 

Written by jonathanjk

December 18, 2010 at 13:43

Focus and Recompose

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Focus and recompose is a frequently used technique by many photographers. It is often used when you want to compose their subject in an area of the frame that doesn’t have an autofocus point nearby. On many cameras which have just a few focus points, focus and recompose is sometimes the only strategy that you will have at your disposal. When shooting in bright light with small apertures, this strategy can work just fine. However, when you shoot with wide apertures, focus and recompose can lead to poor results, even failure. 

This is from a blog post by James Duncan Davidson. 

Written by jonathanjk

September 30, 2008 at 07:28

Panasonic/Leica 25mm Lens Overview

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Here are a list of links showing the Panasonic/Leica lens review in numerical order.  For the moment I cannot create a dedicated page for the review due to coding issues.
Remember all the images provided here are full res versions converted from untouched RAW, one reason for them downloading slowly.  If you downloaded them for making comparisons I suggest you use LightRoom and it facilitates that function very well.

Panasonic/Leica Random Images (Part 8)

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All these images are just a selection of images taken with the Panasonic Leica lens. I’ve focused using the centre focus point on the camera and all the images are comparisons using f1.4 and f2 unless stated otherwise. For the portraits I have focused on the eye and then attempted to re-centre the image.

UPDATE: A few people have been interested in the specular highlights the camera produces, here are also two images that reflect that.
Specular Highlights 2

Specular Highlights 2

Specular Highlights 1

Specular Highlights 1

Panasonic/Leica 25mm (Part 7)

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Here is where the review begins to get interesting, it’s just Panasonic/Leica images here on in! Sunday was a terrible day for weather so I was confined to my house and back garden for most shots. Sorry!

I was interested in the Depth of Field and the Chromatic Aberration if the lens would produce any. Which it did, slightly at higher f-stops in the centre and to the sides at lower f-stops. I took some random images as well for a later part in this review and it does so up slightly in other images, again it disappears at lower f-stops. It must be noted that I can’t see any CA unless I zoom really close in so I’m not concerned so much about it, but your reactions may very.

There was no need for me to create crops of these images as the zoom function illustrates well the details I’m talking about.  I’m trying to not comment too much as I want the images to speak for themselves.

Written by jonathanjk

August 10, 2008 at 21:40

Panasonic Lumix/Leica 25mm f1.4 (Part 2)

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Lens and Test information

NOTE: Part two is mainly about the differences in the lenses and how it works for me. Part three has the comparison pictures so skip ahead if you don’t want to read about my decision to buy the lenses I owned. I’m not going to comment on the Olympus E420 itself.

What I’ve done is compare this prime lens with two zoom lenses, it isn’t entirely fair of course and comparisons like these are obviously unbalanced to a degree.  What I’ve done is limit the two zoom lenses to the 25mm focal length in order to keep things balanced.  The two zoom lenses are:

In terms of 35mm they equate to the numbers in the brackets. The sensor size for the 4/3rds system has a x2 magnification because it is 50% smaller than a 35mm film negative.  For more information about 4/3rds click the link.

Both lenses have a moving aperture and the f-stop moves in accordance when selecting the focal length. So of course while comparing Bokeh and making comparisons between lenses, the Leica lens will of course produce a greater depth of field because of its higher f-stop!

Now for me personally I have three favourite focal lengths, they are the 24mm, 50mm and 85mm (35mm actual lengths). The 4/3rds system at the moment doesn’t offer many prime lenses when compared to other camera systems. So I knowingly made this compromise because Olympus were offering such a small camera system and I was interested in the 12-60mm Zuiko lens (also small for a zoom lens) because it covered the three focal lengths I like to use the most.
The Zuiko lens itself is quite fast, covering f2.8 at the wide end and f4 on the long end. I could be quite happy to stay at the 12mm focal length using it like a prime, it might seem like a waste but when compared to the price of the Leica prime it was roughly the same and everything else the 12-60mm can do becomes a bonus. So I bought the 12-60mm knowing it would serve me well, until I shot in low light or with a small depth of field.
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