⚡ New here? Only read this box. Come back to the rest when you're curious.
I want to…
Do this
Just take photos — I don't care about settings
Turn dial to A+ and shoot
Blurry background (portrait look)
Dial to Av · set a low f-number (f/1.8–f/2.8)
Freeze fast motion
Dial to Tv · set 1/500 or faster
It's dark and photos are noisy
Try a lower ISO first · if already low, you need more light
Record video
Flip the switch to ▶ · press red ● button
Photos are blurry
Check: is AF on? Half-press shutter to focus before shooting. Use faster shutter if subject is moving.
The Mode Dial
The top dial controls the camera's autopilot level. Most people never leave the left half.
Symbol
Name
What it does
Good for
A+
Scene Intelligent Auto
Camera controls everything
Total beginners, grab shots
CA
Creative Auto
Auto + nudge blur & brightness
Stepping off full-auto
P
Program AE
Auto exposure, manual ISO/flash/WB
Intermediate "smart auto"
Tv
Shutter Priority
You pick speed · camera picks aperture
Motion control
Av
Aperture Priority
You pick f-stop · camera picks speed
Background blur, depth control
M
Manual
You control everything
Studio, copy stand, full control
▶
Movie
Video recording
Video
💡 Best first step into manual: Use Av mode. Set f/4 or f/5.6 and let the camera figure out the rest. You get creative control over depth of field without worrying about exposure.
The Exposure Triangle
Every photo is a balance of three things. Understanding all three is what separates snapshots from deliberate photos.
◎
Aperture
Light & background blur
⏱
Shutter Speed
Motion freeze or blur
☉
ISO
Brightness & noise
◎ Aperture (f-stop)
Controls how much light enters the lens and how blurry the background is.
The unintuitive rule: smaller number = bigger hole = more blur + more light.
f/1.8 → huge opening f/16 → tiny pinhole
f-stop
Background
Light
Use for
f/1.8–2.8
Very blurry
⬤⬤⬤ Lots
Portraits, low light
f/4–5.6
Moderate
⬤⬤ Some
Everyday, kit lens
f/8–11
Sharp throughout
⬤ Less
Products, documentation
f/16–22
Everything sharp
Minimal
Macro stacking
⚠ Kit lens (18–55mm) only opens to f/3.5 at wide and f/5.6 zoomed. For serious background blur you need a prime lens — grab the 50mm f/1.8 from the lens bag.
f-stop animation showing aperture blades opening and closing
Aperture blades physically opening and closing
Side-by-side comparison of shallow vs deep depth of field
Same scene · f/1.8 vs f/11
⏱ Shutter Speed
Controls how long the sensor is exposed. Faster freezes motion; slower blurs it.
Speed
Effect
Notes
1/1000 s+
Freezes fast motion
Machinery, sparks, sport
1/250–500 s
Freezes people
Safe everyday speed
1/60–125 s
May show slight blur
Handheld safe zone (IS lens)
1/30 s and slower
Motion blur / streaks
Tripod required
Bulb (B)
Open as long as held
Light trails, astrophotography
⚠ Flash sync limit is 1/200 s — shoot faster with flash and you get a black band across the frame.
Grid of photos showing same scene at different shutter speeds
1/1000 s → 1 s: same scene, same light
Animated gif showing motion blur difference at different shutter speeds
Real-world motion blur difference
☉ ISO
ISO makes the sensor more sensitive to light — but higher sensitivity = more grain (digital noise). Use the lowest ISO that gives a correct exposure.
ISO
Noise
Use when…
100–400
✓ Clean
Outdoors, studio lighting, bright workshop
800–1600
Slight grain
Indoors, dim ambient light
3200–6400
Visible grain
Dark room, no other option
12800–25600
Heavy grain + soft
Emergency only — image quality drops noticeably
Field of View & Crop Factor
The 750D's APS-C sensor is smaller than a full-frame (35mm film) sensor. The practical effect: every lens acts 1.6× more zoomed in than it would on full-frame. This is called the crop factor.
Lens focal length
Acts like on 750D
Typical use
18 mm
~29 mm
Wide — fits a full workbench in frame
35 mm
~56 mm
Close to natural human vision
50 mm
~80 mm
Flattering short portrait
85 mm
~136 mm
Classic portrait / detail
200 mm
~320 mm
Strong telephoto / distant detail
📌 The 18–55mm kit lens at 18mm is wide enough to fit the full CNC table or EinScan turntable in frame from ~60–80 cm away — good for documentation shots.
Autofocus
AF Modes
Mode
Behaviour
Use for
ONE SHOT
Locks focus when you half-press ◉
Still subjects — product shots, copy stand
AI FOCUS
Switches automatically between modes
Mixed / unpredictable subjects — safe default
AI SERVO
Continuously tracks a moving subject
Moving people, machines, action
Picking an AF Point
By default the camera uses all 19 points and picks for you. For precision:
Press the ▦ AF point button (top-right of viewfinder)
Use the d-pad or tap the screen to move the active point
Half-press shutter to lock, then recompose if needed
💡 Macro / copy stand: Flip the lens switch to MF. Use Live View + the magnifier button (🔍) to zoom 5× or 10× — lets you nail focus manually to the pixel.
☀ White Balance
Tells the camera what counts as true white. Wrong setting → blue or orange colour cast everywhere.
Symbol
Setting
Use when…
AWB
Auto
Default — works in most situations
☀
Daylight
Direct sun
☁
Cloudy
Overcast, open shade
💡
Tungsten
Warm bulbs / incandescent
□💡
White Fluorescent
Strip lighting (most makerspace rooms)
K
Kelvin (manual)
Full colour temperature control
□
Custom (grey card)
Most accurate — set from a reference card
Under the makerspace fluorescent strips: use White Fluorescent — or shoot RAW and correct in post.
Makerspace Tips
Product & Object Documentation
Av mode · f/8–f/11 — maximum sharpness front to back
ISO 100–400 under studio lamps; bump up only if needed
Flip the screen out for overhead copy-stand shots
White balance: Custom or shoot RAW for most accurate colour
Close-up & Macro
Kit lens works down to ~25 cm · use extension tubes (lens bag) for tighter work
Flip lens to MF + use Live View magnifier for hair-precise focus
f/8–f/16 recommended — depth of field gets very thin at close range
EinScan 3D Scanning Reference Photos
Shoot the object before placing on the turntable — useful colour/texture reference
Enable Anti-flicker: MENU → 📷 → Anti-flicker shooting — helps under strip lights
Workshop Events & Documentation
AI Focus · ISO Auto (cap 3200) · Av f/4–f/5.6
Articulating screen is great for floor-level or overhead angles
Canon Camera Connect app + Wi-Fi = phone as wireless shutter remote
Useful Lens Options
Lens
Why
18–55mm f/3.5–5.6 (kit)
General use — fits wide scenes
50mm f/1.8
Cheap, sharp, cinematic background blur
Macro lens
PCBs, components, small objects
Known Quirks
Astrophotography banding: Horizontal stripes appear under aggressive post-processing — an inherent limitation of the Hybrid CMOS AF III phase-detect pixels. Not a defect.
Dark circle issue (early units): Canon repaired a small batch with circular dark patterns under certain conditions. Check serial number if shooting small apertures in bright light.
📋 Technical Specs
📷 Sensor
⏱ Shutter
🔍 Autofocus
☉ Sensitivity
▶ Video
🖵 Body
□ Sensor Size Comparison
Format
Size
Crop
🔌 Lens Compatibility
Mount
💾 RAW (.CR2) vs JPEG
RAW
JPEG
Set via: MENU → 📷 → Image Quality
⊙ Metering Modes
Mode
When to use
Technical Specifications
Canon EOS 750D — Complete Specifications
📷 Sensor & Imaging
Sensor type
APS-C CMOS · 22.3 × 14.9 mm
Effective pixels
24.2 MP · 6000 × 4000 px · 3.71 µm pixel pitch
Crop factor
1.6× (multiply any lens FL by 1.6 to get effective angle)
Image processor
DIGIC 6 · 14-bit RAW processing
Metering
63-zone iFCL · 7560-px RGB+IR sensor
⏱ Shutter
Type
Electronic focal-plane
Speed range
1/4000 s — 30 s · Bulb
Flash sync
X-sync at 1/200 s
Continuous shooting
5.0 fps · 180 JPEG or 7 RAW frames
🔍 Autofocus
Points
19 cross-type · centre double cross-type at f/2.8
Live View AF
FlexiZone-Multi/Single · Face Detection · Movie Servo
▶ Video
Full HD
1920 × 1080 @ 24p / 25p / 30p
HD
1280 × 720 @ 50p / 60p
Codec
H.264 / MPEG-4 AVC · .MOV container
🖵 Body & Connectivity
Screen
3.0" vari-angle Clear View II touchscreen · 1,040,000 dots
