Pentax 540FGZ II HELP


alasdairfyfe

Link Posted 19/03/2014 - 13:50
I have just a couple of questions? I have just bought a Pentax AF540FGZII to go with my 645D.

Does the Flash unit set the correct speed that can be use for handheld on the 645D? The flash has set shutter at 1/50 on my 645D or do I need to increase the shutter speed. Previously I have always worked on the speed being 1/60 as the slowest speed for handheld shots?

I have a 55mm D FA 645 1:2.8 Lens. The flash unit sets the zoom at 43mm automatically? Should this not be 55mm? or do I need to make manual adjustment ?

Thanks

johnriley

Link Posted 19/03/2014 - 14:12
Just try it and see, but I expect the 645D will have a slower flash synch speed because of the much larger shutter. What that is will be detailed in the operating instructions.
Best regards, John

alasdairfyfe

Link Posted 19/03/2014 - 18:43
johnriley wrote:
Just try it and see, but I expect the 645D will have a slower flash synch speed because of the much larger shutter. What that is will be detailed in the operating instructions.

Thanks John. I will try it and see. I checked the operating instructions and it states the flash sync as 1/125.

Kind regards

Alasdair

ilovesaabs

Link Posted 19/03/2014 - 19:34
alasdairfyfe wrote:
I have a 55mm D FA 645 1:2.8 Lens. The flash unit sets the zoom at 43mm automatically? Should this not be 55mm? or do I need to make manual adjustment ?

Thanks

I've never checked to see what the AF540FGZ does on APS-C cameras whether it takes into account the crop factor, but since the sensor is larger than 36x24mm the 55 will effectively be a wide-angle, probably wider than 43mm in 35mm terms so I would refer to the manuals or wisdom on the forums to see whether the flash goes wide enough if it indicates 43mm
AKA Welshwizard/PWynneJ
Assorted Pentax/Nikon/Mamiya stuff

alasdairfyfe

Link Posted 19/03/2014 - 22:37
ilovesaabs wrote:
alasdairfyfe wrote:
I have a 55mm D FA 645 1:2.8 Lens. The flash unit sets the zoom at 43mm automatically? Should this not be 55mm? or do I need to make manual adjustment ?

Thanks

I've never checked to see what the AF540FGZ does on APS-C cameras whether it takes into account the crop factor, but since the sensor is larger than 36x24mm the 55 will effectively be a wide-angle, probably wider than 43mm in 35mm terms so I would refer to the manuals or wisdom on the forums to see whether the flash goes wide enough if it indicates 43mm

Thanks for the info ilovsaabs. I will do as suggested.

Kind regards

vic cross

Link Posted 20/03/2014 - 09:00
On my old (long gone) film 645 the flash speed was 60th. and the lens was 3to2 ratio with 35mm. Or in other words a standard 75mm lens was the same as a 50mm lens on 35mm camera therefore a 55mm lens is the same as a 36.6666666666666666666mm lens on a 35mm camera.
CHEERS Vic.
Born again biker with lots of Pentax bits. Every day I wake up is a good day. I'm so old I don't even buy green bananas.

alasdairfyfe

Link Posted 20/03/2014 - 18:41
vic cross wrote:
On my old (long gone) film 645 the flash speed was 60th. and the lens was 3to2 ratio with 35mm. Or in other words a standard 75mm lens was the same as a 50mm lens on 35mm camera therefore a 55mm lens is the same as a 36.6666666666666666666mm lens on a 35mm camera.
CHEERS Vic.

Thanks Vic. That is really helpful.

Kind regards

gartmore

Link Posted 21/03/2014 - 13:10
The flash sync speed is 125th. If the flash camera combination is setting at 1/50 then one or both are set to P

As far as handheld shots are concerned the sync speed is irrelevant largely, the effective exposure is the duration of the flash which could be 1/10000sec.
Ken
“We must avoid however, snapping away, shooting quickly and without thought, overloading ourselves with unnecessary images that clutter our memory and diminish the clarity of the whole.” - Henri Cartier-Bresson -
Last Edited by gartmore on 21/03/2014 - 13:12

northernmonkey

Link Posted 23/03/2014 - 20:25
vic cross wrote:
On my old (long gone) film 645 the flash speed was 60th. and the lens was 3to2 ratio with 35mm. Or in other words a standard 75mm lens was the same as a 50mm lens on 35mm camera therefore a 55mm lens is the same as a 36.6666666666666666666mm lens on a 35mm camera.
CHEERS Vic.

Actually the 55mm equates to around 67mm in 35mm terms. The 645D has a 44x33mm sensor. The 55mm is optimised for this size and not the traditional 645 format.

vic cross

Link Posted 24/03/2014 - 09:14
OK Mr monkey. As you can see I was referring to an old film 645. If things are different on a 645D then so be it. I bow to your superior knowledge of the modern version of a great camera. Film or Digital.

Alasdair. Just enjoy your nice new toy.

CHEERS Vic.
Born again biker with lots of Pentax bits. Every day I wake up is a good day. I'm so old I don't even buy green bananas.

alasdairfyfe

Link Posted 24/03/2014 - 21:04
Thanks Vic. I will certainly enjoy playing with it.

Kind regards
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