Category Archives: Equipment

Commentary, Equipment

The Economics of DSLR “Protective” Filters

1 Comment

The subject of whether or not to get so-called “protective” UV filters for DSLR lenses comes up a lot. I used to respond to the question frequently – so frequently that I eventually gave up and just wrote a post on the subject that I could refer people to when they ask.

However, during a recent weak moment I wrote a new response to the notion that ‘protective’ filters provide good value for all photographers. As I do from time to time, I’m sharing it here:

Someone wrote: … would you rather pay $150 on a filter that *might* compromise your shot or spend $150 on replacing the front element and have *no* possible risk of image degradation from the extra piece of glass?

I replied: This is essentially an insurance question. Obviously, if we knew that our lens would certainly be destroyed in a way that was 100% preventable by using a filter we would almost certainly get a filter. But that is an imaginary scenario that is far from reality.

Most lenses will never be damaged in any serious way. My hunch is that this is actually the fate of a very small percentage of lenses – probably far less than 10%, and I would bet closer to 1%.

Of those that are damaged, only some will suffer a blow to the front element. There are many other modes of failure – a dropped lens that breaks the mechanism, something crashing into the side of the lens, water damage, etc.

Of those that suffer a blow to the front of the lens structure, only some will result in contact with the front element. Of those in which contact with the front element occurs, some would not cause any damage or any significant damage. Some would damage the front element, but would be violent enough that the filter would not have prevented the damage. A few that might not have damaged the front element will send glass shards from the broken filter into the front element and damage it. In some subset of cases, all of the variables might line up just right and prevent damage.

At this point the user would have to replace the broken high quality filter at a cost that varies depending on a number of factors. Let’s use a figure if $100 for an expensive L zoom. The owner has now invested something on the order of $200… which is not much different from the cost of replacing a front element, as I understand it.

In terms of the probability of damage, the cost of the filter, the likelihood that the filter would save the day… the filter is probably one of the worst insurance investments you could make.

Am I unalterably and completely opposed to the use of ‘protective’ filters? Almost, but not quite. While I do not think that it makes sense to automatically stick such a filter on every lens for general use – see the link above for more on this topic – I can think of one sort of situation in which I might use one. I would consider a filter if I were shooting a sealed-body camera (such as a Canon 1-series) and was working in conditions that were truly dangerous to my equipment (and not just a bit of mist or ocean spray) and I was using of the small number of L lenses that become sealed (and not all do) with the addition of a filter.

Other than that? No.

G Dan Mitchell Photography | Flickr | Twitter | Facebook | Email
Text, photographs, and other media are © Copyright G Dan Mitchell (or others when indicated) and are not in the public domain and may not be used on websites, blogs, or in other media without advance permission from G Dan Mitchell.

Commentary, Equipment, Ideas

Megapixel Mania – An Extended Riff

11 Comments

I read (yet another… ;-) megapixel rant somewhere online yesterday, and it got me thinking again about the fixation on megapixels as a measure of camera “value,” and the odd and sometimes irrational ways that people respond to this issue. It is well known that over the past decade or more, as digital photography technologies have become more and more prevalent (displacing film in many areas), camera technology has continued to advance in many ways. Among these advances is the ability to increase the number of photosites on sensors of a given size – e.g. give us “more megapixels.”

The responses to this tend to fall into three broad categories: Continue reading Megapixel Mania – An Extended Riff →

Equipment

Canon 24-70mm f/2.8 L II vs. 24-70mm f/4L IS vs. 24-105mm f/4 L IS (and more?)

51 Comments

Anyone who spends any time in photography forums discussing Canon lenses has seen this topic come up regularly: the comparisons between the 24-70 and 24-105mm L zoom options. If you follow this subject you are familiar with posts asking which of these lenses is “best” or claiming that one or another is great and the others are poor, and with the ensuing debates. Rather than re-writing what I have to say about this every time the subject comes up, I thought I would post once here and then link back to this article.

(Update 1/4/13: Things have changed in significant ways since I first posted this review back in 2011 – primarily with the introduction of two newer Canon 24-70mm L zooms. I have made a few updates to this post to reflect those changes. I have now had the opportunity to use the updated Canon EF 24-70mm f/2.8L II lens. It is also a very fine lens and a great performer. In addition, there is now a Canon EF 24-70mm f/4.0L IS USM lens as well, and the Canon 24-105mm f/4L F/4.0L IS lens is still available. Canon shooters have an over-abundance of good lenses that cover the 24mm to whatever-mm focal length range at this point. All three of these current lenses are excellent options and the functional differences among them now are the primary basis for selecting one over the others. If you need f/2.8 and are OK with a smaller focal length range and not having IS, the 24-70mm f/2.8 could well be your choice. If you can get along without f/2.8, are OK with the smaller focal length range, would like IS, can make use of semi-macro capabilities and want a smaller lens, then the 24-70mm f/4 IS lens can be a great option. If you don’t need f/2.8,  but do value image stabilization and a significantly larger focal length range, the 24-105 is a wonderful choice. )

(Update 1/8/15: And now there is yet another lens in this general category from Canon, the EF 24-105mm f/3.5-5.6 IS STM Lens. I have incorporated some information about this option below.)

Continue reading Canon 24-70mm f/2.8 L II vs. 24-70mm f/4L IS vs. 24-105mm f/4 L IS (and more?) →

Equipment, Technique

Yet Another Reason to Like Live View – Shooting in the Wind

5 Comments

I have posted in the past about some of the advantages of having a live view feature on your camera, especially for the types of photography that I do using my Canon 5DII. This past week I discovered another use, and an unexpected one at that – shooting in conditions of gusty winds.

I most often work from the tripod, and I usually use a pretty large and stable tripod in the context of shooting a full frame DSLR camera. But in some very windy conditions putting the camera on a tripod is not sufficient to stop camera motion and the consequent blur. This is especially a problem when you are shooting in low light or otherwise need to use very long exposure times, and it becomes worse when using long lenses which will catch more wind and magnify vibrations. There are a bunch of tricks that you can try in order to keep the camera steady, but in really strong winds the camera is just going to move, especially if you have a very large lens attached.

One way I try to deal with this is to time my exposures for moments when the wind may momentarily decrease. This can require a lot of patience – sometimes I’ve had to wait several minutes for a very brief halt to the gale, during which I try to make my exposure. But even in this case, you have to make sure that the camera vibration stops completely if you are using a long lens. Ultimately, you have to simply trust that the camera really has stabilized since there is no way to tell directly. Last week, as I was using live view to focus a 400mm lens on a distant subject and again noting that 400mm plus 10x software zoom in live view makes the camera very sensitive to vibration. In the past I have noted this mainly in the context of how darn hard it is to manually focus a big lens this way! But this time it occurred to me that I could use this in my favor.

With the 10x live view magnification enabled, the display is very sensitive to camera motion from the wind. I realized that by leaving the camera in the 10x magnification setup after composing the shot that I could simply watch this display, with its magnification of motion, and wait until the image stabilized during lulls in the wind to take my shots. If the display isn’t bouncing at 10x, motion blur is not going to be an issue. Problem solved. More or less.

G Dan Mitchell Photography
Flickr | Twitter (follow me) | Facebook (“Like” my page) | LinkedIn | Email

Text, photographs, and other media are © Copyright G Dan Mitchell (or others when indicated) and are not in the public domain and may not be used on websites, blogs, or in other media without advance permission from G Dan Mitchell.