FAQ: Purchasing a DSLR System

EJB

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Just a general guide from my POV having gone through several DSLR purchases and hope to help those genuinely interested in purchasing one.

TOC
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1) Which camera?
  • i) The DSLR system
  • ii) Sensor size & Crop Factor
  • iii) What is mount?
  • iv) I hate heavy bodies/lenses


2) What lenses?
  • i) Fish eyes
  • ii) Wide-Angles
  • iii) Mid-Zooms
  • iv) Tele-zooms
  • v) Macro
  • vi) Primes
  • vii) Zoom Times
  • viii) Fast Lenses


3) What else do I need?
  • i) Cleaning Accessories
  • ii) Filters
  • iii) Memory Storage
  • iv) Bags
  • v) Dry Cabinet
  • vi) Tripods/Ballheads



1) Which Camera?

Before you ask which camera is good, consider first getting a DSLR as investing as a whole system. Once you embark on one system, changing requires you to change your entire gear accordingly.

i) The DSLR System

Many think that in a DSLR purchase, the important part is the camera body itself. This in fact is a myth and oft mistaken for the bulk of the purchase. The purchase should be regarded as purchasing a system. Moons to come, your lenses are very likely the only ones that stays through the years with you as compared to a DSLR body.

You would likely to have gone through a change in camera body every 2~4 years or so depending on your photography needs or urge to upgrade. Your lenses, the collection of it, will stay with you. The bulk of the cost now becomes visible as the lenses. The camera's cost is pretty much negligible now

So coming back to the question, which camera to go for? Decide on the system first. A good idea to start is with the leaders of the market eg: Canon or Nikon. Both have good systems, each with flaws and each with pros. You will take forever trying to deliberate between the two. This is where you need to test the camera bodies physically to see if you like the feel. Button layouts, grip handling, weight (which adds on the stability with long lens).

Having said that it's time to come face to face with the pros and cons of the camera. No camera body is perfect. Everybody will focus on the flaws and gripe about it. However, I do urge you to reconsider focus on it's strengths instead and work it to your best of skill you have. Griping about flaws will not get you any good shots. Flaws are there to be understood as limitations and what the camera is not capable for. Flaws are not there to be complained and say the camera sucks. There will be another model that will fulfill your needs, but your budget might not meet it.

Know the strengths and weakness of the camera body will aid you in getting your shots and know what not to shoot. Just like self-assessment during appraisal time, knowing your weakness so that you can work over it.



ii) Sensor size & Crop Factor

Each DSLR has different sensor sizes, due to the expensive manufacturing of wafer chips, the larger the chip for the DSLR's sensor, the more expensive it gets. So major and minor players comes out with a smaller chip to keep costs low and makes DSLRs more affordable.

A standard film frame is 36mm x 24mm. Most DSLRs have chips that are smaller than this size aka Crop Factor.

List as of 5 Feb 2016

Canon:
EOS 1DX2 - Full-Frame, aka FF, sensor size is the same as the film frame,

EOS 5D MK3, 6D - Full Frame.

EOS 1100D/750D/760D/70D/7D MK2 - 1.6 Crop factor. The sensor size 60% smaller than film frame.

Nikon:
D610/D750/D810/D5 - FF. Sensor size is same as film.

All Other Nikon DSLRs are at 1.5x Crop factor. Sensor size is 50% smaller than film frame.

However, an average DSLR's sensor is still way much larger than a digital camera. Optics used are larger and better than that designed in digital cameras. So, if you want to compare a digital camera's output to a DSLR, don't bother. A DSLR would have a better output than any digital camera, even with just a simple kit lens.



How does a crop factor affects your shots

As a whole, having the crop factor means your angle of view becomes smaller, so essentially your image is narrower.

The focal length remains as dictated by the lenses, but the angle of view changes.

On a 1.3 crop factor, eg: a 24-70 glass would give you an angle of view equivalent to 31.2-91mm.

On a 1.5x crop factor eg: a 24-70 glass would give you an angle of view equivalent to 36-105mm.

On a 1.6x crop factor eg: a 24-70 glass would give you an angle of view equivalent to 38.4-112mm.

On a 2x crop factor eg: a 24-70 glass would give you an angle of view equivalent to 48-140mm.



Note: The angle of view changed, your focal length remains the same, the lens did not 'zoom' extra distances.



iii) What is mount?

Mount refers to the portion where you fix on the lenses to the body, that part is known as the mount. Different camera brands uses different mount.

Nikon - F mount
Canon - EF mount


iv) I hate heavy lenses/bodies

Before you judge the weight, think of how the weight can assist you in getting a good shot. Ample weight is present due to the elements, electronics used. Each glass and a body's design is to aid the user in holding the setup firmly and be able to shoot comfortably.

Most digital cameras are small, easier to shake when shooting using hands. DSLRs have a sturdy weight whereby if a tripod is not needed, helps to stabilise the hand-holding. The weight is there for a reason. Do not attempt to brush off the weight as something not important. It can seriously help you hold better and be more sturdy.




2) What lenses?

Now this is a very hard to answer question, what lenses do you need/want? Most of the time, I would recommend the user(s) to just keep to their kit lenses and when they hit into situations whereby their current gear cannot suit their needs, they will know what they need to purchase.

The guideline here is very vague and serves only to demonstrate the terms used and the likely applications. However, remember that a good photographer is one that uses the lenses to capture his pictures, not using the situation to determine his lenses!

My recommendation for choice of lenses, will be in the first paragraph of this section.


i) Fisheyes

Like the name suggest, these are a special range of lenses used to create that rounded image effect, they cover essentially a very wide angle with special effects of curvature at the extreme sides.

Canon has the 8-14 f/4L Fisheye
Nikon has the 10.5DX f/2.8G FE for their 1.5x DSLRs, 16mm f/2.8D FE for FF


ii) Wide-Angles

These lenses have a larger angle of view, meaning they are able to capture more in the horizontal area.

General uses (as a whole, take with a pinch of salt):
  • Landscapes
  • Wedding table group shots

Photography Trivia: In photography terms, anything less than 50mm is considered wide angle lenses, but personally I prefer to term wide as anything below 36mm. Up to individual preference.

Eg:
Canon: 16-35 MK2 f/2.8L, 17-40 f/4L, 10-18 (for Crop bodies).
Nikon 12-24 (for DX DSLRs only), 14-24, 17-35, 18-35G


iii) Mid-Zooms

These lenses are generally, covering from less wide to slightly further distances, normally not exceeding 120mm thereabouts (as a general guide).

General uses (as a whole, take with a pinch of salt):
  • Street-shooting
  • Event shots
  • Casual shooting
  • Portraits


Eg:
Canon: 24-70, 24-105, 28-135
Nikon: 24-70, 24-120, 28-105


iv) Tele-zooms

These lenses are usually power packed for longer coverage, normally used to cover distances not normally covered by foot easily. Most would use for events whereby they can't get near to the stage as well.

General uses (as a whole, take with a pinch of salt):
  • Street-shooting
  • Event shots
  • Portraits
  • Simple nature shots

Eg:

Canon: 100-300, 70-200
Nikon: 80-400, 70-200


v) Macro

As the name implies, these lenses are used to capture subjects up close, normally used in areas of flora/fauna shots.

General uses (as a whole, take with a pinch of salt):
  • Flowers
  • Insects
  • Jewellery
  • Products




vi) Primes

Primes are a type of glasses, where it doesn't zoom, it only focuses because the distance it covers is fixed, the elements do not zoom.

General uses (as a whole, take with a pinch of salt):
  • Portraits
  • Sports
  • Low-Light situations
  • Birding/Safari


Eg:
Canon: 28..85, 200, 300, ... 1200
Nikon: 24..85, 200, 300, ...600


vii) Zoom Times

A lot of buyers are confused when it comes to 'the number of zoom times'. For digital cameras there's 3x, 4x, 5x etc. In the realm of D/SLRs this number is in significant. The furthest range in zoom is not calculated by these 'times'.

Here's why:

The calculation for zoom times

Zoom times = (longest distance / shortest distance)


Consider the following lenses:

18-200mm
Zoom times = 200 / 18 = 11.1x

500mm
Zoom times = 500 / 500 = 1x

70-200
Zoom times = 200 / 70 = 2.86x

17-35
Zoom times= 35/17 = 2.0x

Look at the 500mm, 500mm covers up to 500mm (literally), but it's only a 1x zoom. This does not mean that it's shorter than 18-200 where it's 11.1x. Am I right? Anybody knows 500mm is further than 200mm.

Look at the 70-200, it's a 2.86x vs 11.1x of the 18-200. But again, it still covers up to 200mm for both lenses.

The 17-35 although covers 2x, but doesn't even reach the 500mm as compared to the 500mm lens.

Thus, it's useless to compare the number of 'zoom times' for lenses in DSLR. You gauge the distance coverage and zoom power by the zoom range of each individual lenses itself.
 
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EJB

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viii) Fast lenses

In a short quick explanation, fast lenses are lenses with a big aperture. I consider anything faster than f/2.8 as fast.

Eg: f/1.0, f/1.2, f/1.4, f/1.8, f/2.0 and f/2.8

Of course, these lenses don't come cheap but this is another FAQ, which will not be covered here.


Any glass can be used to capture anything, do not limit yourself by the general uses stated here!







3) What else do I need?

Generally, not being snobbish, but, if you need to ask, you don't need it now. Why? Because you don't know what you need, you'll end up buying a lot of things you don't need/want and regret!

Read on for general information again!


i) Cleaning Accessories

Generally, you need two very basic items.

  • Blower
  • Lens Cloth

Blower is to be used to blow away particles from your items before you attempt to use the lens cloth to clean any lens surface.

Even if a protective UV filter is attached, blower should be used to clear away the larger particles and let the lens cloth clean up the rest.

Do note that lenses are coated, these coating CAN be destroyed by scratches, fungus and/or wrong cleaning methods. At all times, AVOID using solutions on the glass elements itself.

Coatings cannot be reapplied, the whole element will be required to change.


ii) Filters

- This is the only exception to "don't buy if you don't know", you MUST buy a protective filter for your lenses -

Generally speaking, you only need one type of filters necessary for lenses. You should affix a UV filter onto your lenses to protect the front elements.

Remember: A UV filter CAN be replaced at low cost. A front element CAN'T.



iii) Memory Storage

ALL DSLRs do not come with a storage card in it's package. Most of these times you will be required to purchase one, or get a free one due to bundle by the manufacturer etc.

So do NOT ask the shop why the package doesn't have a memory card!

So which cards to choose? Given the majority these days uses SD card, any card that is labelled as Class10 would suffice. Why not class4? The reasoning is very simple.

All cameras comes with an Input/Output (IO) processor that governs how data is being recorded to the card or read from the card. DSLRs unlike digital cameras, employ very fast IO processors (varies across the DSLRS) as the files generated by DSLRs are larger, heavier and more space hungry (eg: RAW files).

Faster cards do benefit from the faster IO on DSLRs. SD cards have the following classes:

Class 2 (min 2mb/s)
Class 4 (min 4mb/s)
Class 6 (min 6mb/s)
Class 10 (min 10mb/s)

Faster cards not only enables the camera's IO to write faster, it also clears up the camera's buffer, allowing you to shoot more consecutive shots.

In a nutshell how camera IO works:

Takes a picture ==> Keeps in camera's buffer (temporary storage) ==> Writes to card.

If you'd realise, as you depress the camera button, a "R14" (example) appears above. This is the number of shots the camera's buffer can temporarily store before it writes to card.

The faster the card, the buffer clears faster, you can go back in action faster.

On higher end cameras, this becomes a very vital bottleneck when you need speed as the IO is often very capable of writing to cards at high speed.

Some recommended SD cards: Sandisk Extreme (45mb/s) Sandisk Extreme Pro (60mb/s).





iv) Bags

Another subjective topic. Here is why you'll appreciate to understand why women needs so many bags.

Different bags, different usages.

There's no one bag that fits all. At different shooting occasions, you'll have different needs. Your bag collection will grow because of these needs.

For eg:

Sling bags - Good for fast access, good for events, light weight equipment

Back packs - Good for trekking, good for carrying heavy equipment.

Different sling bags and backpacks will have different sizes to suit different needs. So don't be surprised you need more than 1 bag!


v) Dry Cabinet

Just get one.


Humidity level must be set to be between 45% and 55% of the humidity level. Too dry, your equipment will be damaged. Too wet, the lenses will suffer from encouraged fungal growth.




vii) Tripods/Ballheads

Thought most may not agree with "get the best once, and forget it forever" due to costs. And most would not want to afford a carbon fibre tripod and expensive ballhead, do however, consider getting a proper tripod.

A sufficient tripod should fulfill the following list of requirements and is by far NON-EXHAUSTIVE!!!

  • Height
  • Supported Weight
  • Stability


Height - Most think that a good tripod's height is gauge with the centre column extended. This is a wrong thinking. With the centre column extended, it's even more unsteady as the centre of gravity has risen sharply with the DSLR weighted on top of the tripod.

A good height gauge, is that the tripod must without extending the centre column but with legs fully extended should have the camera's heighest point in your eye level or slightly thereabouts.


Supported Weight - Do note that you should plan for the future expansion and the gear you will be purchasing. If you know you will buy heavier equipment, prep for the equipment you intend to purchase. Think far, don't look at the current setup only. Remember the ballhead must support your camera at portrait/landscape level!!!



Stability - The tripod should be stable when you place the camera setup on it, mild knocks should not set it toppling over, when you use timer to take images, it should not be blur. Stable tripods normally either come heavy, since weight will force the setup to sturdy, or they will come expensive, aka carbon fibre tripods.

The choice of a good tripod/ballhead lies in your decision. A good gauge is 10% cost of your entire equipment. This amount should be spent on a tripod/ballhead.


I hope this helps. And please, do not copy this and use it elsewhere without prior permissions. I appreciate if errors are pointed out or additions can be made into this little guide to help the interested DSLR purchases.

If I have the time, I will do a short one for digital cameras.
 
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hlw8888

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upz for such a good thread. Perhaps this can be made into a Sticky for ppl to reference to.
 

extemporisation

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Good stuff for the newbies! This screams: sticky!

Just a suggestion here: How about adding a list of reputable shops to buy cameras from?

That question seems to be asked rather often..


Edit: Oh, and a reference to other good resources? Eg. those stickied threads in CS?
 
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tazzi80

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For your section on dry cabinet,

Humidity level must be set to be between 45% and 44% of the humidity level. Too dry, your equipment will be damaged. Too wet, the lenses will suffer from encouraged fungal growth.

Think you type your humidity level wrongly. Too small of a range :s13:

Wide angle for Canon, you forgot the famous 10-22mm, though its an EF-S.
 

EJB

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tazzi80 said:
For your section on dry cabinet,

Humidity level must be set to be between 45% and 44% of the humidity level. Too dry, your equipment will be damaged. Too wet, the lenses will suffer from encouraged fungal growth.

Think you type your humidity level wrongly. Too small of a range :s13:

Wide angle for Canon, you forgot the famous 10-22mm, though its an EF-S.
Thanks! I've edited the error. Thank you for your keen eye!
 

Sapphy

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Up this thread! Definitely good for people who wants or considering a DSLR.
 

bobosooter

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besides Olympus, all Four Thirds systems have 2X crop factor. And 4/3 system lenses can be used on different brands' bodies due to the common mount.
 

EJB

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Erenon said:
I could do n expansion on filters if you like EJB.
Well, this guide was aimed at providing minimal support to buying DSLRs and not really going indepth to the filters, lenses, etc. :) However, I'm sure people will appreciate a guide in filters.
 

sleo

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Well done! I had always been wondering the difference between a DSLR and a normal digital camera where both are 8 megapxiels. Your entry just gave me what I needed to know.
 

bartleby

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Nice FAQ. This is a good read for those who wanted to dive into the world of DSLRs. I will recommend this to aspiring DSLR owners.
 
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