Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
05-08-2015, 11:36 AM   #31
Site Supporter
nozoom's Avatar

Join Date: Dec 2010
Location: Akershus
Posts: 46
QuoteOriginally posted by Anguel Quote
The more I think about this the more I am confused. If "zoom size" recalculates from FF to APS-C, why do I see 55 mm in the flash display when I have set my lens to 55 mm and not the APS-C equivalent?
Look at this way: It does not recalculate. The flash is customized for the Pentax camera. It knows that it is mounted on an APS-C camera. It will zoom correctly according to what lens you mount on the camera (to the nearest wider zoom position so it will not vignette) and will indicate that in the display (the 58 AF-2 shows what the reflector is zoomed to, not the actual focal length mounted). If you want to, you can let the flash show you what 35 mm "equivalent" focal length that would be. To do that you will have to turn "zoom size" off (gruber_69 indicated that "zoom size"=off will not stick on the 64 AF-1, though it will on my 58 AF-2, but why on earth should I want to turn zoom size off?).

I guess the confusion is that the manual tells what zoom positions it wold show with zoom size=off (what the flash would cover on FF). Another example of how easy those ridiculous crop factors leads to confusion. These numbers are of no interest. You have to divide all those numbers by ~1.5. Then you get (I guess they have rounded these numbers to the nearest commonly used focal lengths): 16-19-23-33-47-57-70-120-133.

Last edited by nozoom; 05-08-2015 at 11:54 AM.
05-11-2015, 02:20 PM   #32
New Member

Join Date: May 2015
Posts: 9
Hi! I tested with the K-30. With zoom size ON (default) the flash displays the same focal length as engraved on the lens: 55 mm up to 70 mm. With zoom size set to OFF, the flash displays 85 mm - 105 mm. What confused me first was the fact, that the flash always jumped back to zoom size ON as soon as the shutter was touched and displayed the non FF numbers. Therefore, I thought that there was something wrong. gruber_69 reported the same zoom size reset problem above.

Update: A far more annoying thing is the fact that all pictures in P-TTL are underexposed. A-Mode seems to work much better for some reason...

Last edited by Anguel; 05-11-2015 at 02:27 PM.
05-11-2015, 09:57 PM   #33
Veteran Member
sterretje's Avatar

Join Date: Dec 2008
Location: Roodepoort, South Africa
Photos: Gallery | Albums
Posts: 3,534
QuoteOriginally posted by Anguel Quote
Update: A far more annoying thing is the fact that all pictures in P-TTL are underexposed. A-Mode seems to work much better for some reason...
That's the camera incorrectly interpreting the exposure; pTTL does not have the best reputation. If it's consistent, you can easily dial in some flash compensation.

In A-mode, the flash decides on correct exposure instead of the camera. As the 64 'copies' the camera settings (when used in the hotshoe) it's just as convenient as pTTL (unless you need HSS).
03-17-2017, 05:45 PM   #34
Site Supporter

Join Date: Aug 2014
Posts: 48
I am getting similar problems with Pentax K-1 and Pentax 70-200 F2.8 lens

I got the Metz flash today. It came with the latest firmware for Pentax (1.1). If I use this with Pentax 24-70mm lens, the auto zoom is working fine. Now when I tested this with Pentax 70-200mm lens, the autozoom works up to 105mm and after that it is not showing anything more. If the zoom is at 135mm or 150mm or 200mm, the LCD on Metz 64 AF-1 shows 105mm.

This seems to be the similar issue faced on the APS-C cameras. Somehow Metz 64 AF-1 cannot get the zoom information from Pentax (may be Pentax is not sending it properly).

Did anyone test Metz 64 AF-1 with longer zooms (anything over 105mm)?

03-20-2017, 05:06 PM - 1 Like   #35
Site Supporter

Join Date: Oct 2010
Location: Melbourne
Photos: Gallery
Posts: 2,912
To be honest I hadn't even noticed this problem as I have not yet used the flash past 70mm.

For those who are able to read German, I found a statement issued by Metz.

Basically it says it is not Metz's fault. The K-1 is communicating with the flash correctly but not past 70mm (105mm)
It cannot be rectified by Metz.

I am not sure, but it is plausible Pentax/Ricoh are not aware of this problem. We now have to find a way to lobby Ricoh to rectify this in one of their next FW updates.

How do we do this. I will see if any of my Japanese friends can be of assistance.

Blitzgerät mecablitz 64 AF-1 digital verfügt generell über einen Motorzoom-Reflektor von 24 mm bis 200 mm mit verschiedenen festen Stellungen. Dabei wird normalerweise der Zoomreflektor automatisch an die Brennweite der Kamera entsprechend angepasst. Dazu wird von der Kamera der Brennweitewert über den seriellen Datenbus an das Blitzgerät übermittelt.

Wir mussten nun allerdings feststellen, dass Pentax-Kameras zwar diese Übertragung durchführen, jedoch aber als maximalen Brennweitenwert 105 mm bzw. 70 mm (bei Zoom Size) an das Blitzgerät weitergeben. Falls eine längere Brennweite an der Kamera genutzt wird, überträgt die Kamera aber trotzdem nur den maximalen Wert von 70 mm bei Zoom Size. Aus diesem Grund kann das Blitzgerät leider keine längere Brennweite an der Kamera erkennen.

Dies kann auch leider nicht durch eine Modifikation des mecablitz 64 AF-1 digital geändert werden. Aus diesem Grund kann der Motorzoom-Reflektor des mecablitz nur entsprechend manuell eingestellt werden, falls eine längere Brennweite genutzt und die maximale Leitzahl benötigt wird.
End of Quote
03-22-2017, 08:42 AM   #36
New Member

Join Date: May 2015
Posts: 9

If I remember correctly I also spoke to Metz here in Germany on the phone some time ago. As Schraubstock states, they explained to me that the maximum of 70 (105) mm is due to the bit width of the Pentax interface, i.e. there are no more bits to communicate bigger numbers. Also, I think they told me that there are no Pentax flashes that can zoom past those numbers. Please correct me if this is not the case.


  • 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!
135mm, 70mm, af-1 auto, auto, camera, flash, length, lens, metz, metz 64 af-1, pentax help, photography, reflector, troubleshooting
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
Metz 64 AF-1 digital - new flash also coming for Pentax iDon Pentax News and Rumors 32 11-10-2016 10:39 AM
New Metz Mecablitz 64 AF-1 i83N Pentax Camera and Field Accessories 7 04-16-2015 07:18 PM
Pentax 645Z + Metz 64 AF-1 Digital MKD Pentax Medium Format 5 03-29-2015 05:56 PM
Metz 44 af-1 or Metz 52 af-1 Driline Flashes, Lighting, and Studio 14 09-12-2014 08:37 AM
Question on Metz 48 AF-1 zoom information Taikonaut Flashes, Lighting, and Studio 16 09-25-2012 07:13 PM

All times are GMT -7. The time now is 01:56 AM. | See also:, 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?
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]