Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
10-26-2010, 02:57 PM   #16
Senior Member
jrforman's Avatar

Join Date: Mar 2008
Location: Minneapolis
Photos: Gallery | Albums
Posts: 202
QuoteOriginally posted by Naim Khan Quote
Thanks for taking the trouble JR. I did try bouncing off the wall with no obvious difference. However, I have taken more shots - all in Aperture priority at f5.6. My niece kindly agrees to be the guinea pig.
No PP has been done.
This is with Stoffen diffuser and directed at the subject:


This is with Stoffen and bounced off wall:

This is with Stoffen and bounced off ceiling:


and this last one is without a diffuser and directed at the subject:


I'll wait to see what you think.
Cheers
The last three exposures seem to be good. The one with the Stoffen pointed straight ahead seems under exposed. I think that is your issue. I can't find the reference but included with one of my Stoffen's it had a warning that when used in a straight ahead fashion can generate poor results and accordingly always have it tilted 45 degrees or better. If the picts with the bounce run a little hot, just give your flash a -1/3 or -2/3 FEC and you should be good to go.

10-27-2010, 01:31 PM   #17
Forum Member




Join Date: Sep 2010
Location: Sofia,Bulgaria.
Posts: 56
Този проблем и с АФ-360 ФГЗ ли го има?
Само като насочиш флаша към тавана,или не?
10-27-2010, 03:07 PM   #18
Senior Member
Naim Khan's Avatar

Join Date: Mar 2010
Location: Wakefield, West Yorkshire
Posts: 177
Original Poster
QuoteOriginally posted by pefoto01 Quote
Този проблем и с АФ-360 ФГЗ ли го има?
Само като насочиш флаша към тавана,или не?
I am not sure if I have understood you correctly or not but my flash unit it Metz 58. The overexposure occurs when it is tilted up or to the side. Exposure is OK whne it is pointing straight at the subject.
10-27-2010, 03:15 PM   #19
Senior Member
Naim Khan's Avatar

Join Date: Mar 2010
Location: Wakefield, West Yorkshire
Posts: 177
Original Poster
QuoteOriginally posted by jrforman Quote
The last three exposures seem to be good. The one with the Stoffen pointed straight ahead seems under exposed. I think that is your issue. I can't find the reference but included with one of my Stoffen's it had a warning that when used in a straight ahead fashion can generate poor results and accordingly always have it tilted 45 degrees or better. If the picts with the bounce run a little hot, just give your flash a -1/3 or -2/3 FEC and you should be good to go.
JR, to me the 2 shots in the middle look over exposed.
I have been in touch with Pentax UK/Europe since yesterday and have sent them a couple of photos. They agree with my impression about the one that I think is overexposed. My feeling is that the camera doesn't register there is a flash attached when it (the flash) is tilted. The camera then exposes according to what the background light is and PTTL doesn't shut the aperture when sufficient light has hit the sensor, which leads to overexposure. I think it will need a firmware update to sort the problem out.
Let's see what Pentax have to say.

10-27-2010, 03:40 PM   #20
Forum Member




Join Date: Sep 2010
Location: Sofia,Bulgaria.
Posts: 56
Имам проблеми с превода.
За флаша разбрах,кога преекспонира.
Благодаря!
Привет!
10-27-2010, 03:42 PM   #21
Forum Member




Join Date: Sep 2010
Location: Sofia,Bulgaria.
Posts: 56
А някой знае ли как е К-5 с АФ-360ФГЗ?
10-27-2010, 04:23 PM   #22
Pentaxian




Join Date: Mar 2010
Location: SW Washington
Posts: 814
FYI, my flash is the Pentax AF-360FGZ, so it is not isolated to Metz.

It is easily verifiable that the flash is moderating the flash power in direct flash, but as soon as it is at an angle (diffuser or no diffuser), it fires at full power with no regard to exposure. It is not only seen by carefully controlling the settings (as I noted in the other thread), but obvious by observing the flash itself. In direct flash, the flash is brief and recharged almost instantly. At an angle (any angle, even shallow) the flash is much, much brighter, and the charge has been fully drained, necessitating a several second recharge, even at very close range (3 feet away, 5 feet to the ceiling).

This is not normal behavior, and the completely blown out exposures do not look as expected. I have verified this with my K-x many times with exactly the same settings, location and ambient lighting, as well as the very same K-5 itself with Auto mode on the flash.

Last edited by Cannikin; 10-27-2010 at 04:37 PM.
10-31-2010, 02:51 AM   #23
Senior Member
Naim Khan's Avatar

Join Date: Mar 2010
Location: Wakefield, West Yorkshire
Posts: 177
Original Poster
I have kept in touch with Pentax UK and on Thursday one of the tech guys asked me to take some shots at ISO 100 and then Auto at 100-400. Unfortunately I have been a bit busy so only took the photos last night. The Pentax gentleman is also a member of the forum, although he asked me not to divulge his identity so I am not doing so. Hopefully he is subscribed to this thread but in any case I am going to email him as well.
This first is at ISO 100 and directly at subject:


ISO 100 + bounce up


ISO 100-400, Bounce up


ISO 100-400, Bounce side


ISO 100-400, Bounce from back wall


The results are better than with higher ISO but there still is a problem AND we should not be expected to change the ISO every time we want to use flash.
The Pentax gentleman promised me that they were studying the results and are planning to contact their engineers soone.

10-31-2010, 10:43 AM   #24
Forum Member




Join Date: Oct 2010
Location: des veoux rd west, kennedy town
Photos: Gallery | Albums
Posts: 51
Here's how i do mine. Hope this will help in some way.
MANUAL FLASH MODE : In my AF 360 FGZ, i tried to measure the flash and it gives me a reading at Flash power at 1/8, distance 2 meters, (K-20D,K-7,K-5) at F8, ISO 200 using FA 31mm ltd. And then using Sigma zoom F2.8, 24-70mm at F6.3 (with the same setting) . Remembering the difference between F1.8 and F2.8 lenses at least gives you an idea how to adjust either the flash power, bigger aperture, or pushing the ISO up a bit and its your choice which one will suit you best.
The reason I use manual is that it produce consistent output disregarding the luminance of the subject outfit.(this may not 100% foolproof, but at least you have the basis in simple math.
( with few adjustment flash compensation). I shoot with umbrellas and soft boxes and always get the exposure needed.

Also I use two flash gun but most of the time ended up just bouncing the master on the ceiling if applicable.Using a Master(Sigma EF500 FGZ bounce up) and Pentax AF360 as slave in P-TTL in 1/3 or 2/3 power also provides good contrast.

Im not really sure how the pentax manage to produce a decent flash output using ISO all the way up to its unexpanded limit ISO 12800 (.... haven't tried the expanded yet)
The built in Flash actually gives me an acceptable exposure even using ISO 2500 in few pictures Flickr: Please wait...
( My K-7 provides me at a distance of 1.5ft at F14 and ISO 200 built in flash -0.7 1/180 consistent output )
10-31-2010, 11:03 AM   #25
Veteran Member




Join Date: Aug 2008
Location: California
Posts: 851
I have found my k-7 with 360FGZ to be completely useless in p-ttl mode when fired at 45 degrees with a stofen. Usually it WAY overexposes the flash but it seems random to me. I generally just shoot manual flash exposure anyway.

When Pentax flashes are fired at 90 degrees without modifiers I have found them to be just as reliable as Nikon or Canon (I use all three systems on a regular basis) but as you deviate from that basic shooting position the P-TTL start to run into trouble.
11-01-2010, 03:20 AM   #26
Pentaxian
fs999's Avatar

Join Date: Jul 2008
Location: Luxembourg
Photos: Gallery
Posts: 3,551
I don't have the problem with my Metz 48 AF 1.

But my Dörr macro flash doesn't work correctly with my K-5.
When both are on, the flash is triggered continuously and when I try to shoot all shots are black.
The flash works well on my K-7...

There must be a problem with the K-5...
11-02-2010, 05:44 AM   #27
Senior Member
Naim Khan's Avatar

Join Date: Mar 2010
Location: Wakefield, West Yorkshire
Posts: 177
Original Poster
I have just come off the phone with Pentax. They say they have escalated the problem and have referred it to Pentax Europe. Presumably they are taking the matter seriously and are trying to sort it out ASAP.
11-02-2010, 02:35 PM   #28
Pentaxian
fs999's Avatar

Join Date: Jul 2008
Location: Luxembourg
Photos: Gallery
Posts: 3,551
It is as I thought, it is a K-5 problem... some flashes won't work on a K-5 !

I have a friend who also has the Dörr macro flash and has the same problem, but his Sigma EF 500 DG Super works fine...
11-04-2010, 12:03 PM   #29
Veteran Member




Join Date: Jan 2009
Location: Budapest
Posts: 821
I've just tried it with a few quick snaps in the living room and everything seems to work fine. Metz 48 flash, flash light bounced off the wall and ceiling, took shots at ISO800 and ISO3200, exposure is fine and there's absolutely no overexposure.

ISO 800 shot:


ISO3200 shot:
11-04-2010, 02:32 PM   #30
Pentaxian
fs999's Avatar

Join Date: Jul 2008
Location: Luxembourg
Photos: Gallery
Posts: 3,551
Does nobody else have a Dörr Macro Flash ?
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
camera, dslr, flash, iso, k-5, k-5 ii, k-5 iis, k5, pentax k-5, shots
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Sigma 530 Super flash doesn't fire multi flash, any advice? pasipasi Pentax DSLR Discussion 4 11-25-2010 02:04 AM
For Sale - Sold: Metz 48 AF-1 Flash; Pentax off-camera flash cable set (Adapter F, FG (US/UK/CA bigben91682 Sold Items 4 10-12-2010 04:23 AM
Basic Pentax K-x, hot-shoe, flash, flash bracket, wireless question MrPetkus Flashes, Lighting, and Studio 5 04-27-2010 10:57 PM
For Sale - Sold: Pentax AF200S flash, Vivitar 2800 macro flash, Lowepro Lens case 4 Light_Horseman Sold Items 8 03-06-2010 10:13 AM
For Sale - Sold: Pentax TC's, Kenko TC, SF10 (x2), AF540 flash, Promaster FTD 7000M flash Marc Langille Sold Items 17 08-16-2008 10:29 AM



All times are GMT -7. The time now is 12:10 PM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top