Blog Post

APS-C vs. Full Frame Sensor

Derek Smith • 4 August 2022
an aps-c mirrorless sensor
APS-C vs Full-Frame: What’s the difference?

Full-frame sensors measure the same as 35mm film, which is 36 x 24mm. Meanwhile, smaller APS-C sized sensors measure in at either 23.6 x 15.7mm (Nikon, Pentax, Sony, Fujifilm) or 22.2 x 14.8mm (Canon). That makes full-frame about 2.6x larger in terms of total surface area size.
As already mentioned, there is also Micro Four Thirds (17.3 x 13mm, MFT), and Medium Format (43.8 x 32.9mm).
 
Full-frame sensors can be found in the best full-frame mirrorless cameras, as well as many of the best DSLRs. You’ll even occasionally find a full-frame sensor in a high-end compact camera. Full-frame sensors are used by Canon, Nikon, Sony, Panasonic, Pentax, Sigma and Leica.

You’ll find an APS-C sensor in many of the best mirrorless cameras too, and they’re also commonly used in DSLRs. APS-C sensors are used by Canon, Nikon, Sony, Fujifilm and Pentax. Again, occasionally there are APS-C sensors found in high-end compacts.

The physical size differences lead to both advantages and disadvantages, which we’ll discuss in more detail below.

What is a crop sensor?
You might hear the term crop sensor from time to time, which simply means something which is smaller than full-frame. It’s a term which is most commonly applied to APS-C, but it can also be used to describe even smaller sensors, such as Micro Four Thirds, or even the smaller sensors that you find in compact cameras and smartphone – though it’s rare to hear those described as such.
What is a crop factor?
Crop sensors have a crop factor that you need to take into account when using lenses with your camera. When using a full-frame camera, whatever focal length is printed on the lens (for example 100mm) is what you’ll get when you shoot with it. However, when you use a smaller sensor, you’ll need to apply a “crop factor” to get the equivalent focal length.

Nikon, Fujifilm, Sony and Pentax APS-C sensors have a 1.5x crop factor, while Canon APS-C sensors have a 1.6x crop factor. Therefore, the 100mm lens mentioned above gives you an equivalent of either 150mm or 160mm – simply times the focal length by the appropriate crop factor.

Other sensor sizes have different crop factors. A Four Thirds sensor has a 2x crop factor (100mm becomes 200mm), while a one-inch sensor has a 2.7x crop factor (100mm becomes 270mm). It also works with bigger than full-frame sensors too – medium format has a 0.79x crop factor, which would make a 100mm lens equivalent to 79mm.

List of sensor crop factors:
Medium format = 0.79x
Full frame = 1x
APS-C (general) = 1.5x
APS-C (Canon) = 1.6x
Four Thirds: 2x
One inch = 2.7x
What are the benefits of APS-C?
When it comes to image quality, it’s a general rule of thumb that a bigger sensor equals better performance – but there’s plenty of advantages to APS-C, usually depending on what exactly it is you want from your camera.

One of the big advantages is that APS-C systems are normally smaller and lighter than full-frame equivalents. With smaller bodies and smaller optics, it’s a good choice if you don’t want to carry heavy gear, such as while travelling or for hiking long distances. If you want to shoot handheld, it can be easier to keep smaller and lighter bodies stabilised, too.

On that note, the crop factor also means that your longer lenses don’t need to be as long, heavy, or expensive as full-frame equivalents to get you closer to the action. That’s why cameras such as the recently announced APS-C cameras Fujifilm X-H2S and the Canon EOS R7 have been pitched strongly as wildlife and action cameras.

Speed is also something that is generally easier to achieve with APS-C, especially at affordable prices. Cameras like the Canon EOS R7 offer up to 30fps shooting, in a camera which costs a fraction of the price of similarly speedy models, such as the Nikon Z9 or the Canon EOS R3. That gives ordinary amateur photographers without the big budgets of professionals the chance to capture fast-moving action in a much more affordable fashion.

Does sensor size matter?
Having a smaller sensor can give other benefits as well, and here’s an example which illustrates the cost and weight advantage of using APS-C, particularly when looking at the whole system, which includes the camera and lenses.

APS-C system: Fujifilm X-H2S, plus 16-55mm f/2.8 and 100-400mm f/4.5-5.6 costs £5200 and weighs about 2700g.

Full-frame system: Nikon Z9, plus 24-70mm f/2.8 and 100-400mm f/4.5-5.6 costs £8800, and weighs about 3500g.
To sum up, the main advantages of APS-C cameras are:
Cheaper
Faster
Smaller
Lighter
APS-C cameras are best for:
Wildlife photography
Sports photography
Travel photography
Street photography
Photographers on a budget

What are the benefits of Full Frame?
Full-frame is often seen as the “gold-standard” for many photographers, with APS-C often thought of being the preserve of enthusiasts and those with a lower budget. While that’s not strictly fair or accurate these days, there are lots of advantages of using a camera with a larger sensor.

If the best image quality is your main concern, then generally speaking, full-frame will help you achieve that in a wider variety of settings. Low light performance is generally better, as is dynamic range for the most part.

If you crave super high resolution cameras, you’ll only find them with full-frame (and larger sensors) too. APS-C tends to max out at around 26-32 megapixels, whereas full-frame offers up to and beyond 50 or 60 megapixels (you can go even further with medium format, where you can now get 100 megapixel sensors). This generally makes full-frame better suited to high-detail type shots, as well as giving you more flexibility when it comes to cropping in post-production while still maintaining a high pixel count.

It’s easier to achieve a shallow depth of field when using a full-frame sensor. Although you can achieve the same look when using crop sensors, you might need to get too close to the subject for the same kind of background blur. It’s generally why portrait photographers, for example, prefer to use full-frame.

When it comes to using your lenses, knowing exactly what you’re getting (i.e. 100mm = 100mm) when shooting full-frame is more straightforward. That also means if you’re using older / vintage lenses from DSLR or even film days, you know exactly what you’re getting when using them on mirrorless full-frame models.

To sum up, the main advantages of full-frame cameras are:
Better image quality
Higher resolution
Easier shallow depth of field effects
Straightforward to understand lens focal lengths
Full-frame cameras are best for:
Landscape photography
Portrait photography
Low light photography
Studio photography
Which should I buy – APS-C Vs Full-Frame?

There’s not necessarily a right or wrong answer when it comes to full-frame vs APS-C and deciding which you should buy. You should think about the types of subjects you like to shoot, the budget you have available, and how much bulk and weight you are prepared to carry around.
If you’re a landscape photographer, for example, looking for a high-resolution camera which can deliver exceptional dynamic range, and you also want to shoot in low light, then full-frame is the obvious choice. Similarly, if you’re a portrait photographer who wants the best resolution and easy-to-achieve shallow depth of field effects, full-frame is the way to go.

On the other hand, if you’re a wildlife or sports photographer and don’t want to splash out on a super-expensive full-frame camera, but you do want to get close to the action, use fast-frame rates and carry something small and lightweight, then APS-C is probably the more sensible option. Travel photographers who don’t want to unnecessarily weigh themselves down might also choose to opt for APS-C, or Micro Four Thirds for an even smaller system.

To conclude, the simple truth is that no, not every photographer needs full-frame. While the larger sensor will provide higher image quality in lots of different scenarios, you’ll also have to pay the price for it both in terms of cost and size and weight. For that reason, many will be served just as well, if not better, by choosing a crop camera.


Louth Photographic Society

by Derek Smith 20 February 2025
The Society held the prestigious Print of the Year (POTY) competition last night. Our judge for the evening was the affable, and highly experienced Brian Gromett. The feedback on the prints presented on the evening was exceptional, I am sure that many members, me included, had not considered some of the compositional elements in our photographic prints that Brian pointed out, and many of us gained a lot of insight last night. The “Print of The Year” award was given to Keith Rossington for his portrayal of “Nige” in the Colour section, and to Dave Turner with his stunning “Reading Isaiah 31” in the Monochrome section, congratulations to them both. The Competition page of the website has been updated, however I would be grateful if members could provide me with copies of images with a top three placement, as many of those images are missing.
by Derek Smith 18 February 2025
GAS, (Gear Acquisition Syndrome), is something that afflicts us all at times, I have the Fuji X-T3, and the Fuji X-S20, and 95% of the time I’m very pleased with the images that I create with these cameras and my lenses. As good as the Fuji XF 70-300mm lens is though, sometimes I do need a little more reach, and the Fuji XF 100 – 400mm lens is too big, too heavy, and too expensive. However, whenever a new camera is announced, there’s often a temptation to consider other camera systems. Now, OM Systems have recently announced the micro four thirds sensor camera the OM-3, and I keep looking at that camera, but the pricing of almost £2000 is beyond my budget, and it may not suit my photography style. Several years ago, I sold all my Sony gear, and bought into the Olympus micro four thirds system, creating some wonderful images, but the focusing on the E-M5 wasn’t great for birds in flight, otherwise my photos from Olympus were generally good. When considering a new camera, or choosing another brand of camera, its important to evaluate exactly what you hope to achieve by changing camera brand. Whilst I enjoy my portrait, and glamour photography, I want to take more landscape, nature, and macro images. For my needs any new camera must have dual UHS II card slots, and a focus joystick, the best fit came down to two cameras the Canon EOS R7, and the OM Systems OM 1. The R7 is outside my budget, and I wasn’t sure about the ergonomics, and so I’ve decided on a used micro four thirds sensor OM System OM 1. The purchase will be financed by selling my Fuji X-T3 and buying the OM System OM 1 camera, a 25mm f/1.8 lens, (full frame equivalent 50mm), and a 75 – 300mm (full frame equivalent 150 – 600mm) zoom lens. I have always had a soft spot for the Olympus / OM System cameras, the latest OM 1, and OM 3 cameras have the new 20-megapixel BSI sensor with 1053 cross type contrast, and phase detect focus points, and new faster processor, resulting in improved autofocus, and several computational photographic modes including Live ND filters, “In camera focus stacking”, and a “Live Composite” mode for low light night photography. This photo of barges was taken with an Olympus E-PL7 camera at f/6.3, 1/500, ISO 200, with the Olympus M.Zuiko 17mm f/1.8 prime lens.
by Graham Harrison 16 February 2025
Last week it was my turn to show you some PDI's some new and some the oldest PDI's I had, I hope you all enjoyed the evening. The oldest ones were from 2011 when I first ventured into digital cameras, I was a bit late converting waiting to see if they would catch on, they certainly did and for most of us now film and especially transparency film is a distant memory, but a happy one. This week, Wednesday 19th February, we hold our Print Of The Year (POTY) competition; and the judge for the evening will be Brian Grommett. I did visit Gibraltar point the other week and photographed my first Marsh Harrier, it was a long way off even for my 600mm lens which gives you 900mm on an APS sensor camera, so not the sharpest photograph but good to see. Very little else to photograph but a good lunch at the cafe there. There is a sand racing meeting at Mablethorpe today (Sunday) at about 11.30, which members may be interested in attending to get some good sport photographs. If only this cloud cover would disappear. Regards Graham
by Derek Smith 13 February 2025
It’s always interesting to view other members photographic work, most of the work displayed from other photographers is only shown in our competitions. Our meeting held last night was “Presidents Night”, a chance to view what photographic subjects, and outings that Graham Harrison has taken over last year, and some from proceeding years. Members were treated to an impressive cornucopia of projected images, Graham showed photos from his trips to Conwy, Wales, the Yorkshire, and Northumberland coasts. These are just some of the images from Grahams extensive collection of images. Thank you, Graham, for a very interesting evening, Dave Mann for refreshments; always much appreciated, and a big welcome to our newest member Steve Chapman.
by Graham Harrison 9 February 2025
Good Morning All Last week at the club we held a PDI competition, with the categories of "Local Still Life" and "Open", member Tony Gaskins judged the Open with a lot of thought and advice shortlisting nine and picking Derek Smith's portrait G'day as the overall winner. I then had the task of judging the still life, there were quite a lot of different ideas for still life, but I shortlisted the ones I thought fitted the subject best and picking Derek Smith's coffee break which in my opinion was an excellent example of still life photography. The results with images of the top three are on our website. Entries for print of the year (POTY) need bringing in this Wednesday with an email of your titles and which subject the photograph is in to Dave Turner please. This coming week, Wednesday 12th February, for President's night; I will be showing PDI's including some from Yorkshire and North Wales. Regards Graham
by Derek Smith 7 February 2025
We held our PDI competition last night, with the categories of “Local Still Life”, and “Open”. Tony Gaskins began the evening with his judging of the “Open” category, which I always feel is the more difficult category to judge. Tony performed the task of judging excellently, assessing each image as presented to him, providing thoughtful, and useful critique on the various submitted entries. Tony “held back” nine images for further assessment to award a higher points score, then finally choosing the top three images, keeping members in suspense, I was surprised when Tony selected my portrait of a male model as first place. “G’day” was a portrait of a Hungarian male model over for an inexpensive short break in Skegness, I provided the Australian bush hat, and scarf as props for this photo. After the break, it was Graham Harrison’s turn to perform the judging role, this time for the “Local Still Life” category. I personally found this a particularly difficult category to shoot, the keys to a successful image in this category, are imagination, creativity, and most important the lighting of the subject. I use LED constant lighting for still life, as do other members, because the lighting can be positioned exactly as required. I had several unsuccessful attempts at producing images for this category, before selecting three images for submission into the competition. Graham skillfully selected eight images as “hold backs” before choosing the final top three, again I was surprised to find my “Coffee Time” image in first place. Overall, some stunning images were entered into the competition, making for a successful evening, the website Competition page has been updated with the full results. A big thank you to Tony, and Graham for judging, and Dave Mann for his hard work providing the refreshments.
by Graham Harrison 2 February 2025
Good Morning All Thank you Peter for your presentation on Cuba and Prague. We did have a bit of an iffy start to the night but thanks to Paul Rudd the night was saved and power restored. There is a full report on our blog. This week, Wednesday 5th February, we are holding a local competition, with the categories of "Local Still Life" and "Open" (no restrictions) all entries need to be in by midnight tonight, I will be judging the still life and Tony Gaskins the open. It will soon be our print of the year, POTY, to newer members who might think February is an unusual time for the competition it's because our camera club year runs from the first Wednesday in May to the last Wednesday in April. You need to send your titles to Dave Turner and bring your prints on February 12th. All the information on entering the print of the year is on our website but feel free to email Dave if you are unsure. Don't forget to think about the March PDI competition including the moon, the one I took at Linwood would just about qualify. There is also the "Prime Time" project, of one photo a month taken with a prime lens to think about now we are into February. Regards Graham
by Derek Smith 30 January 2025
Our very own Peter Cory gave an insightful, and interesting talk on his travels to Cuba, and Prague in the Czech Republic. Peter began his illustrated talk with his visit to Havana, Cuba where he had a week’s holiday in 2000 with family. His photos gave a traveller’s viewpoint of Cuba, with some rundown buildings in the poorer areas, the iconic American cars from the 1950s, and the majesty of the Spanish built cathedral. After the break, Peter continued his talk with his visit to Prague in 2009, and compared to Cuba, the historic city centre looked prosperous and clean. The various photos of Prague made me want to visit the city for a short break sometime in the future. Many thanks to Peter for taking the time to compile the talk, and present to members of the club for a fascinating evening.
by Graham Harrison 26 January 2025
Good Morning, All Last week at the club we had our 2024 project night, "Numbers", only four members had completed the project, hopefully it inspired you to do this year's project "Prime Time" otherwise you may have to put up with one of my old presentations again. There is a report on our website covering the evening. This week, Wednesday 29th January, our member Peter Cory will be giving a presentation on Cuba and Prague. Don't forget to send your local PDI's to Harry, the subject is "Still Life" which you can take in your own house if you wanted, so don't have to venture far, the trick I have found is coming up with ideas. There is also an Open competition. Deadline is midnight, Sunday 2nd February. Harry would also like six PDI's from us all for the N&EMPF club PDI competition, the main rule is they should not have already been in the NEMPF PDI competition and be the best you have. The N&EMPF projector has a 4:3 aspect ratio, so images should be resized to a maximum 1600px width, and 1200px height. Regards Graham
by Derek Smith 23 January 2025
At our meeting last night members presented their 2024 “Numbers” Projects, this was one photo each month, where the photo included a number. The Society chooses a different project each year, for this year, 2025, the project will be “Prime Time”, one photo each month using the same prime (fixed focal length) lens. The evening was well attended, the members images displayed were of high quality, and showed individuality, and creativity in the approach to the project. Graham rounded off the evening with a viewing of his images taken over last summer, and at Beamish. All the images can be viewed on the Projects Page, listed under the Competition Page on the navigation bar.
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