What is an external flash for?


Status
Not open for further replies.

Ian

Senior Member
Feb 20, 2002
2,548
0
0
56
Perth Australia
#2
There are a lot of reasons why an external flash is often required. Some of the major reasons (in no particular order) are as follows:

1) Increased flash range, many inbuilt flash units of have an effective range of a few meters.

2) Ability to bounce flash from ceilings, walls etc.

3) Ability to use diffusion devices such as softboxes and brollies.

4) Being able to reposition the flash relative to the subject.

5) Red and silver eye supression.

6) Reduced battery consumption and ability to use cheaper batteries or rechargables.

7) Shadow suppression and control.

8) use of creative flash technicques such as light painting and so on.

9) The use of specialist flash devices such as ring flashes for medical and macro work, fibre optic guides etc.
 

Zoomer

New Member
Feb 4, 2002
645
0
0
Singapore
reverac.com
#5
Originally posted by shuy
wow thanks!!

ok, say i want to take pics in the dark.... what's the range i can expect from a $100 flash?
If you're using with a digital, I'm currently liasing with a local flash maker to custom make a flash that can sync to the 2nd flash (after 1st 'fake' metering flash).

It'll be roughly about your budget. If you one can tompang one, maybe even cheaper hehe. :D
 

Ian

Senior Member
Feb 20, 2002
2,548
0
0
56
Perth Australia
#6
Originally posted by shuy
wow thanks!!

ok, say i want to take pics in the dark.... what's the range i can expect from a $100 flash?
Don't expect to get much for $100. Flash gear with TTL control and a good range isn't cheap. However you might be able to get a reasonable manual fash gun for that sort of money.

Regardless of type, the flash range is governed by the Guide Number (GN) of the flash unit. The GN is specified by the manufacturer for a given film speed and lens focal length.

Range = GN / lens aperture setting.

Example:
Flash GN 30m at 100 ISO 50mm lens.

Range at aperture f2.0 = 30/2 = 15m
Range at aperture f11 = 30/11 = 2.72m
 

Ian

Senior Member
Feb 20, 2002
2,548
0
0
56
Perth Australia
#8
Originally posted by shuy
what's the diff between a manual and non-manual (isit hotshoe?) flash?
Manual flash units come in two types and are known as 'Non Dedicated' flashes as they can be used on just about any camera equipped with a hot or cold shoe. (a cold shoe has no flash contacts)

Manual only. These are the most basic flash guns available. They usually offer a couple of power settings (eg: full power, 1/2 power etc) and you have to fully configure the flash by hand.

Auto flash units are a more advanced manual flash, these units generally have 2-8 power level settings and also an 'auto sensor' circuit that controls the duration of the flash (ie it's total light output) thus ensuring a more accurate level of flash illumination on the subject. This is achieved by moutning a sensor in the front of the flash (usually by the flash mounting foot) that detects the light output and when it has reached a suitable level for good exposure it turns off the flash. This gives a crude by quite effective method of control.


Dedicated flash units:

TTL (Through The Lens) flash control is considerably more advanced than manual flash systesm.

These flash units rely on the camera to measure the actual light generated by the flash falling on the film plane to determine correct exposure. Once the correct amount of flash illumination is reached the camera instructs the flash to terminate the flash output.

OEM (Original Equipment Manufacturer) TTL flash units are dedicated to their own brand of camera and often to specific models inside the brand, eg: Nikon, Canon, Pentax etc). There are Generic TTL flash units that will work with specified brands, such units are made by the likes of Achiever in HK and often will work with 2-3 brands of camera.

Next question?
 

shuy

New Member
Sep 7, 2002
240
0
0
Alpha Centuari
Visit site
#9
where does the power source from the flash come from?

what does hotshoe mean?

how much is a normal TTL flash? very ex?

thanks for the detailed answer!
 

mpenza

Senior Member
Jan 18, 2002
12,938
0
0
Singapore
www.instagram.com
#10
Originally posted by shuy
where does the power source from the flash come from?

what does hotshoe mean?

how much is a normal TTL flash? very ex?

thanks for the detailed answer!
hotshoe is a adaptor for fixing and triggering an external flash

normal TTL can range from <$50 to >$600.
 

mpenza

Senior Member
Jan 18, 2002
12,938
0
0
Singapore
www.instagram.com
#13
Originally posted by shuy
wah that site uses 2 flashes?? that's abit overkill sia
??? :dunno: ???

the site illustrates the various use of flash, from TTL to Bounce to Fill-in. multiple flash is only one of the small section.

anyway, I've updated the second link which was wrongly given just now.
 

#14
Originally posted by shuy
where does the power source from the flash come from?

what does hotshoe mean?

how much is a normal TTL flash? very ex?

thanks for the detailed answer!
A hotshoe is what you get when you leave your black/dark coloured shoes in the sun and they get hot. ;p

Seriously, a hotshoe is simply the part of the camera where you attach an external flash unit. On most cameras, this is a standard connector, on Minolta cameras at least, it's a proprietary connector.

The power source of the flash comes mostly from batteries or an external power pack. For studio flashes, the power source is usually AC power from the wall socket.

TTL flashes range in price from below $50 for third party units to several hundred dollars, depending on features, power, etc.

Regards
CK
 

shuy

New Member
Sep 7, 2002
240
0
0
Alpha Centuari
Visit site
#17
so could u recommend an auto flash for me? my budget is ard 100 as stated... i'm no expert photographer, just trying it out as a hobby. and i'm a student on a tight budget... hehe

thanks!!
 

Z

zephyr

Guest
#19
Originally posted by mpenza
go for the Achiever 260T. It's cheap ~$36 and works.
You din tell him about the trigger voltage thingy eh? Heee.. Shuy, Get Metz 32Z-1 lah.. you wun regret it... Achiever 260T is also much bigger than Metz 32Z-1...
 

Status
Not open for further replies.
Top Bottom