JONATHAN JK

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Posts Tagged ‘Prime

Fuji X100 ~ David Babsky: How to Show Irrational Bias (Part 1)

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This review of the X100 blew my mind when I read it the first time, it’s by a guest writer called David Babsky over at stevehuffphoto.com. This review does Steve Huff no favours while it’s on his website, as it’s a terrible piece of writing both in content and form. It’s surprising when David Babsky can’t articulate himself in the manner befitting a teacher. The piece is an insult to Steve Huff’s audience, the quality is just that bad with no journalistic integrity, monkeys must have written and proof read it.

Normally I would just make a comment and move on, but you’ll see later in part two why I didn’t. David’s severe unprofessional negative bias is revealed right away, there’s no attempt at all to be objective or take a constructive critical approach.* It’s clear David just wants to bash a camera he doesn’t want to buy.

I’ve provided a breakdown of the 15 problems in his review with what I think is a fair rebuttal.

Read the rest of this entry »

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

Sigma 24-70, HSM f2.8 review part 2 (Vignetting)

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Vignetting

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

Just to note, the focal plane will shift slightly between lenses due to the different designs of glass. At f2.8 and 24mm the Canon 24mm prime has less vignetting, followed by the Sigma, while to my eyes the Canon 24-70 looks sharper overall. At f2.8 the Canon has a more natural darkening of the edges.

The vignetting on the Canon prime at f1.4 is amazing in my opinion.  I love it!

Vignetting up Close

For comparison here are three crops from all the lenses, illustrating the different amount of vignetting. As you can see the Canon 24-70 is darker around the edges than the Sigma version. It also allows the Sigma to pick out more detail from the edges.  I’d say the 24mm Prime is sharper at f2.8 as well. Remember it isn’t working at its widest aperture like the other two lenses.  The vignetting with the Sigma seems more artificial, if you look at the images above, you can see the corners are well rounded unlike with the Canon lenses. The Canon has a more natural darkening of the outer edges.

Canon 24mm at f2.8

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

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

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 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.

Panasonic Lumix/Leica 25mm f1.4 (Part 1)

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First impressions and quick comparisons

First off you can get a sense of the quality, simply by holding it. It’s heavy but not too tiring to handle; it’s actually lighter than the 12-60mm Zuiko lens, the construction is solid. My doubts with spending £558/$1116 were cleared as I fastened it to my camera. I bagged this lens on eBay from a very reliable seller, the seller can be found here. The technical specs of these lenses can be found in the links I’ve provided which I’m not going to go into here, I’m simply going to show test images for other peoples benefit as there is a lot of talk about.

The Panasonic Lumix/Leica lens was something I was after ever since I got hold of the Olympus E420, I always want to keep noise down as much as possible by staying away from high ISO. I love my fast primes; I’ve owned the Canon EF 50 f1.4mm in the past and the Canon 50mm FD f1.2mm, these are also great lenses to own. I could have got the Olympus pancake lens but I wanted something faster than f2.8, that for a prime is kinda poor, granted it is a very small lens.

For Bokeh there would be no comparison either :).

In this first part, I’m offering a size comparison between these two lenses and including a Sekonic light meter to help with scale incase you haven’t seen either lens first hand, I hope this helps?

Pictured below are the two lenses. Notice how much extra in length the Panasonic/Leica is, simply with the addition of the lens hood. With the hood down it is shorter but it reminds me of Dark Helmet (also oversized) from Space Balls, the lens itself is quite big but with it attached to my camera, it is still compact for an SLR. It’s much smaller and lighter compared to my 5D with the 50mm lens attached as well.

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