JONATHAN JK

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Posts Tagged ‘Bokeh

Fuji X100 ~ Round Up Parts 3 and 4

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The Phoblographer has written a six day field test of the Fuji X100. Fairly in-depth covering his first six days with the camera. Check out the days, I’ve included the sections for each day as well:

  • Day 1 – Ergonomics, Focusing, Handling, Menus, Ease of Use, Image Quality (there is also an attempt to shoot manually).
  • Day 2 – Quirks, Image Quality (film modes), Metering, Macro Mode,
  • Day 3 – Film Modes, Metering, Viewfinder Overlay, Bokeh & Image Quality (Macro Mode), About 35mm,
  • Day 4 – Conditions, Flash, Macro Focusing in Low Light
  • Day 5 – Exposure Fine Tuning, Exploring the Meter, ND Filter, High ISO, Low Light Focusing, Auto White Balance
  • Day 6 – Battery and using it with a DIY Ring Flash.

- Michael Carptentier reviews his Fuji X100 against the Panasonic GF1. Originally in French but it’s been run through the Google Translator here. Good comparison between the two cameras. I’m still buying the Fuji X100 though.

- Dpreview have updated their Studio Comparisons, they have also included Fuji X100 test shots.

- Thom Hogan says ‘skip for now’.

- Outback Photo: Field Test Review – Nice lengthy write up with plenty of test images.

- Great size comparison of the X100 against a Leica IIIf

- Ryan Brenizer has used his X100 on a wedding shoot, he shares his well considered thoughts.

- Steve Huff: The top 7 complaints of the X100 and how I get around them. – Great list of fixes to the most common complaints with this camera, most of which are shockingly easy to overcome and aren’t actually an issue.

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- Does the current battery charger annoy you with its cable? The guys over at x100enthusiasts.com have come up with a clever hack to cut out the cord. Check it out here, the picture says it all.

- The same guys from x100enthusiasts have also create a Hyper-focal distance chart for the X100.

- This last link from the same website as previous has a discussion about alternative camera straps. Personally I’m a fan of the standard strap until I find another one I had my eye on but can’t remember the link to. Why? I can wear the camera under my jacket and forget about it while walking around. Though the Gordy strap at the end of the discussion does look nice.

- Do you want a solution to couple GPS to your FujiX100 (or any camera really)? Check out gps4cam over on the Apple App Store.

- Daisuki Photo have tested some SD memory cards for your Fuji X100. More comprehensive then the information I linked to in a previous update. They tested 7 SD cards, surprisingly, some are faster than others but are rated slower. Anyway, we all want to buy one of the new UHS-1 cards don’t we? :-) Helpfully, Daisuki have shopping links to various countries if you want to purchase them.

- For those interested, Daisuki Photo also have a X100 vs GF1 review (making a few comparisons between all the regular attributes plus a video quality comparison), ISO test between the X100 and the GH2 and a size comparison between the X100, GF1, GH2 and the EPL-2. It’s amazing how the X100 isn’t that much bigger and even more amazing how I didn’t come across this website earlier.

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Petr Kleiner’s photo stream can be found here. There are a whole series of these beautifully crafted portraits so check them out. Petr is really showing off what the Fuji X100 can do. The actual image can be found here.

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This image was taken from Fuji X100 Street Photography Flickr Group. I felt like included it because of the perspectives present in the image.
Pigeon & People

Pigeon & People

Photo taken by photovia, his photostream can be found here.

SIGMA 24-70, HSM F2.8 REVIEW PART 5 (Bokeh)

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Bokeh

This is to see which of the lenses produce a better bokeh effect. Wikipedia describes it as:-

“In photography, bokeh is the blur, or the aesthetic quality of the blur, in out-of-focus areas of an image, or “the way the lens renders out-of-focus points of light.” Differences in and aperture shape cause some lens designs to blur the image in a way that is pleasing to the eye, while others produce blurring that is unpleasant or distracting—”good” and “bad” bokeh, respectively.”

Canon Bokeh 01

Sigma Bokeh 01

Canon Bokeh 02

Sigma Bokeh 02

 

Canon Bokeh 03

Sigma Bokeh 03

 

These images are higher res for your viewing pleasure.

From what I can see, the Sigma lens gives a more rounded and far pleasing effect with the out of focus lights. I’m looking for another copy of the 24-70 Canon lens as I want to do some portraits with both lenses. At the moment I prefer the Sigma lens.

Written by jonathanjk

December 23, 2010 at 17:19

SIGMA 24-70, HSM F2.8 REVIEW PART 4 (Sharpness)

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Sharpness

None of these images have been edited other than the normal processing into jpegs from the original raw files.

What you will notice is a slight shift with what each lens can see. They are both set to 24mm but as far as I can tell, the differing lens designs capture two different amounts of space. This is because the Canon lens zooms out in order to capture the 24mm focal length and the Sigma zooms out at the 70mm. I neglected to include the 70mm for both lenses because the difference is even more pronounced. I’m sure this can be corrected but it’s probably beyond my time and patience.

Included below are some crops from the images above. From the centre and the middle showing centre sharpness and edge sharpness.

Centre Sharpness

Sigma

Centre Focus Sigma 24-70 at f2.8 (24mm)

Centre focus. Sigma 24-70 at f22 (24mm)

Canon

Centre Focus. Canon 24-70 at f2.8 (24mm)

Centre Focus Canon 24-70 at f22 (24mm)

You can clearly see the Canon lens is without a doubt sharper in the centre of the lens than the Sigma at f2.8. At f22 it looks like the Sigma catches up some what but the Canon lens still bests it. You don’t even need to see it in the closeups, the thumbnails actually illustrate the differences.

Edge Sharpness

Sigma

Edge Focus. Sigma 24-70 at f2.8 (24mm)

Edge Focus. Sigma 24-70 at f22 (24mm)

Canon

Edge Focus. Canon 24-70 at f2.8 (24mm)

Edge Focus. Canon 24-70 at f22 (24mm)

 

It’s going to be difficult here to make a true comparison because both lenses capture fractionally different  pictures (again lens design dictates this as mentioned previously). I also shouldn’t crop one lens to fit the frame of the other.  Otherwise it wouldn’t be a fair comparison since one of them won’t have been cropped from the edge of the frame.

For example, the details on the left side of the images (arched lines) for the Sigma are on the right side for the Canon crops.  Of course the area captured by Sigma looks sharper but that isn’t as near to the edge is it?  Anyway, the Canon lens I think is still sharper on all counts.  But the Vignetting is more pronounced, producing darker edges at 24mm than the Sigma.

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

Olympus Kit lens (Part 3 of Leica lens Test)

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Olympus 17.5-45mm

Making comparisons.

What I’ve done is organise a few setup shots with all three lenses to measure the differences between each and with:

  • Minimum aperture for each lens
  • f16 selected between all 3 lenses
  • f22 for making comparisons to f16
What I am going to do then is measure the bokeh with minimum Apertures and lens sharpness equally at f16 and just out of interest at f22 to see the difference. This excludes the Leica lens as it is limited to f16 but it will be interesting to see what the other lenses can do.
The minimum focusing distance was something I thought was worth showing, I’ve taken some pictures to show those differences between the three lenses. The images will be unprocessed from best quality Raw, using Lightroom 2 for exporting the RAW files to full quality jpegs.  I’ve shot at ISO 100 as well. PLEASE NOTE, these are full size quality jpegs!

Focusing with the Kit Lens 17.5-45mm
I’ve set up these series of images so each focus point has something of interest at different distances to each other, the Olympus has three focus points. I have a Cactus on the left, Yellow Pages in the distance in the center and my Optimus Prime Transformer on the right as the primary subjects of interest. Everything else in the image will act as a guide to help you make your own judgements, for example behind the Yellow pages is a foldable washing line (to judge image sharpness with lower apertures and to see how much difference Bokeh makes) also on the table is some literature with text reading away from the camera.
If you can’t tell where I have focused, I’ve started first on the Cactus Pot, then the Yellow Pages and then Optimus Primes’ left leg, read the images from left to right for all examples given.

Written by jonathanjk

August 10, 2008 at 16:14

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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