Nikon School

Common confusions in photography

By : Nikon School Blog   |  24 Jul, 2017  |  115

When you start photography, often the sheer volume of knowledge facing you can feel overwhelming. Add to that the many confusing concepts in photography that make it even more difficult for beginners. The most common confusions related to photography are discussed in this blog and should lead to better understanding of some vital concepts.

Full frame, cropped frame and crop factor

DSLRs majorly use two sensor sizes, like the DX and FX formats in Nikon. The FX format is the larger, measuring almost the same as the 35mm format film. It is also called 'full frame'. The DX format is smaller, and is technically known as 'APS-C' format.

The difference between DX and FX formats

There are many confusions regarding the crop factor - the ratio of the size of the two sensors. In case of Nikon, the crop factor is 1.5, which means the effective focal length of DX format lenses is 1.5 times the actual focal length. For example, a 35mm DX format lens has an effective focal length of 35 x 1.5, approx. 52 mm. The FX 35mm lens will not have any crop factor applicable, and will work as 35mm on an FX body. However, on a DX body, this FX 35mm lens will give an effective focal length of 52mm.

Put simply, on a DX body, DX lenses and FX lenses both, will have an effective focal length of 1.5 times the actual focal length.

The DX 35mm lens has a crop factor of 1.5X and an effective focal length of around 52mm.

Autofocus and Auto exposure

The focus modes and exposures modes of a DSLR are independent of each other. You can select manual focus while shooting in auto exposure modes, and use Manual exposure mode with autofocus.

The autofocus modes (above) and exposure modes (below) work independently of each other

Focal length and 'f' numbers

Focal length indicates the field of view (area covered) of a lens and is denoted in millimeters ('mm'). Aperture is the opening of a lens that allows light to come in. The size of the aperture is denoted by 'f' numbers e.g. f/4 , f/5.6, f/8, etc. Though both terms are related to lenses, they indicate different things.

Depth of field and background blur

Many beginners get attracted to the concept of blurring the background and confuse the term depth of field to mean blurred backgrounds. Depth of field is the area around a focused distance within which things look reasonably sharp. An image with a blurred background means focus is on a front subject and the depth of field is shallow, i.e, a small area around the focused subject will look sharp.

A shallow Depth of field
A large Depth of field

Prime and Zoom

Many people think zoom lenses are the big lenses they have seen wildlife or sports photographers carry on their shoulders. However, a zoom lens can be any lens which has a range of focal lengths. The AF-S DX NIKKOR 18-55mm f/3.5-5.6G VR lens is a zoom, though small in size, whereas the AF-S NIKKOR 200-400mm f/4G ED VR II is a large telephoto zoom.

A prime is any lens that has a single focal length. A 50mm is a standard prime, a 20mm is a wide angle prime and the AF-S NIKKOR 800MM F/5.6E FL ED VR is a huge telephoto prime lens weighing around 4.6 kgs.

A zoom lens
A prime telephoto lens

Exposure metering and Manual exposure

Metering modes tell the camera how to analyse light and calculate exposure. However, many people think this is applicable even in manual mode. Sometimes, photographers use spot metering with manual mode but do not get the desired exposure. This happens simply because in Manual exposure mode, the exposure settings are set manually, so the camera metering does not affect the final exposure at all. In manual exposure mode the only thing which the metering mode affects is the exposure indicator that appears on the display and the viewfinder.

The metering modes (right) do not affect exposure in manual exposure mode (left)

It is greatly beneficial if the basics are understood and the common confusions cleared, as it makes you a technically better and confident photographer.

Comments (67)


Mr. Abhishek Kumar

useful content

Mr. manoj kaswan

every thing is good

Mr. manoj kaswan

fine quality

Mr. manoj kaswan

but HD images

Mr. manoj kaswan

so size is different

Mr. manoj kaswan

lenses are different

Mr. Vivekananda Pradhan

Good content

Mr. Vivekananda Pradhan

Good content

Mr. Vivekananda Pradhan

Good content

Mr. Vivekananda Pradhan

Good content

Mr. Vivekananda Pradhan

Good content

Mr. Abhijit Mukherjee

so I love crop sensor camera ??

Mr. Abhinava Pandey

doubts cleared

Mr. Abhinava Pandey

confusion eliminated

Mr. Abhinava Pandey

clear writing

Mr. MCL PrintMedia

2 ??

Mr. Debashis Jana

confusion decoded

Mr. Debashis Jana

confusion decoded

Mr. Debashis Jana

confusion decoded

Mr. Debashis Jana

confusion decoded

Mr. Debashis Jana

confusion decoded

Mr. Manish Vig

Very useful inputs. Thanks.

Mr. Govind Singh

very much understandable details

Mr. Huzaifa Asger ali

Detailed explanation about FX and DX ...thanks

Mr. imran khan


Mr. Harsh Saw

Clearer concepts

Mr. Harsh Saw

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Mr. Harsh Saw

Msat hain

Mr. Hemant Gera

Great function

Mr. Sumit Singh

Nice write-up. Informative for beginners.

Mr. George Jonsoi


Mr. Sri Govind Miraskar

really useful

Mr. Ishaan Kapoor

really helpful

Mr. Deepak Kumar

thanks and nyc information????

Mr. Suman Pal

Thanks its really helpful

Mr. Ashish Pany

thanx.really helpful

Mr. Rakesh Chandran

as a beginner it's very much important to understand and implement the exposure triangle viz iso, aperture and the shutter speed. this is the basic step towards dslr photography. rest is skill to be applied. a nice write-up above is truly informative.

Mr. Prabu Ponnusamy

Nice information

Mr. Ritu Das

very good information, specially for beginners like us.....

Mr. Devaraj Shenoy

Thanks a lot for sharing the information, cleared some doubts......

Mr. Madan Kumar

essential information one should have to understand, as a beginner...

Ms. Susmitha Chendi

thanks for sharing!!

Mr. Harihara Manigandan

Good information for Beginners

Mr. Bhaskar Baruah

tha nks

Mr. Abhishek Golatkar

got it


Thank you for such an informative knowledge..

Mrs. Kabita Pradhan


Mr. Aditya Maity

Like it

Mr. Nanigopal Pradhan

Neat articles nikon!

Mr. Abhigyan Bhuyan

very informative...

Mr. Mohan Kumar

Very much helpful for me thanks nikon

Mr. Abhishek Golatkar


Mr. Vivekananda Pradhan


Mr. Jeevraj Bairwa

Really helful

Mr. Aravinth Ananthan

Such a quick and helpful article. Specially, the last one. Till now I didn't know selecting different metering modes will not change the result in Manual mode.

Mr. GaneshDUTT Gautam

really knowledgeable


very helpful

Mr. Dhananjay Sen

its really helpful

Mr. Akshat Rathee

very helpful

excellent value for lens

Mr. Darsh Limbachiya

very well said ??????

Mr. Pratul Pal

Need some more information...



Mr. Vineet kumar


Mr. imran khan

good information..thanku sir

Mr. GaneshDUTT Gautam


Mr. Pratul Pal

Informative article....