DTTL and wiring problems
Posted 09 March 2003 - 10:28 AM
However with all 5 wires connected in the housing I am unable to fire older strobes (e.g. YS30).
The only solution I can think of is to leave one flash socket wired for DTTL. And connect a second flash shoe adaptor to the other flash socket on the housing, with just two wires connected, to let me use my older non DTTL guns in manual.
Does anyone have any other suggestions/experience with this problem?
Does anyone know if strobes like the YS90DX and the DS-125 will work when all 5 wires are connected?
While writing this post I have got an email suggesting blocking the offending contacts on the hot shoe. Anyone know which ones?
Why couldn't Nikon have got the D100 to work with standard Nikon TTL (like the increasingly attractive S2) rather than just with DTTL?
Posted 09 March 2003 - 11:38 AM
Taken from Stephen Frink's SeaCam site:
But if you are in the field and don't have the right cord, a simple piece of electrician's tape over the contact as in the diagram below will do the trick. NOTE THAT THESE ARE ISSUES OF CAMERA AND STROBE COMPATIBILITY AND HAVE NOTHING TO DO WITH THE HOUSING.
Posted 09 March 2003 - 04:26 PM
Posted 10 March 2003 - 02:45 AM
It is worth noting that when the flash circuitry is disabled in this way the camera no longer knows it has a flash attached - although the flash is triggered when the shutter is released.
As a result we have to watch our flash synch speeds (only 1/180th) when shooting on Aperture Priority Auto - because the camera will not complain/stop us if we exceed them.
Posted 10 March 2003 - 06:50 PM
If you use Ike's manual controller, do NOT have the TTL wire attached. Even though you put the strobe in TTL you are not using TTL you must not have this wire attached. Like mentioned above, with the Ike manual controller you will not get the strobe confirmation light inside the camera to light.
Life is a beach and then you dive.
Posted 11 March 2003 - 01:19 AM
On the page below there are a set of test shots I took in the pool with the D100, Sigma f2.8 28-70 @ 44mm. Exposures were all at 1/160th @ apertures: f32, f22, f16, f11, f8, f5.6, f4 & f2.8. DTTL has controlled these flash dominated exposures (of the orange fish) very well at all apertures apart from f2.8 where the camera was not able to quench the light quickly enough. I am very impressed that DTTL works relaibly over 6 stops.
My D100 test page
I am using insulation tape to block the contacts in the hotshoe. Which I have found is very easy to do, reliable and simple to reverse. I am now happy again because I am able to shoot both DTTL and manual guns!
After trials I am happiest using manual strobes with all three small contacts in the hot shoe blocked (see diagram on webpage linked above). Although as stated by Don (from Stephen Frink) they will work with only the top contact blocked. The solution I am using leaves only the trigger and ground connected - all that is needed to fire a manual flash. I prefer this because I know I have stopped all unwanted communication between the camera and strobe.
Posted 11 March 2003 - 05:48 AM
Did you know that you can "hotlink" to photos in your posts?
I'm going to use your test photo as an example. If you want me to remove it, just ask:
All I did was click on IMG above and enter the url of the test photo. It will display the image from your site in the post.
Again, if you want me to "unlink" it just ask.
Dual Ikelite Strobes
Photo site - www.reefpix.org
Posted 11 March 2003 - 06:48 AM
I'll try the IMG button next time.
I used to use a housed SB26 a few years ago with my film system. But never really got on with it. I did keep the housing - its just a tube with no controls for the strobe. It does have a dome port to maintain the flash coverage.
Anyway the same tube fits the SB80DX and it works very well indeed. I leave the flash on DTTL mode and let the head zoom with the lens. The lightbox, however, doesn't fit in the flash housing. You can turn off the sleep - but I don't think I bothered - because it wakes up again when you half press the shutter.
Posted 11 March 2003 - 12:09 PM
I guess the SB80DX still fires monitor preflashes when flat (bounce position) in the housing?
...... still in D-TTL auto flash mode.
If you wished to use two flash guns with D-TTL, would the second gun need to ignore the preflash?
Posted 11 March 2003 - 11:38 PM
The use of two guns is a real minefield. Standard guns (on slave) will fire at the same time as the DTTL preflash and therefore will not light the picture. A pair of SB80DXs might work - but there is some stuff in the SB80DX instruction manual about this and I can't remember what it says.
I have been considering using a reflector as an alternative to a second strobe for macro - but am not progresssing much with this idea.
For cost, plus the risk of bring additional complexity and problems, I will be sticking with a single SB80DX for macro and standard lenses then going over to a pair of manual Subtronics (that I normally use with my F100 35mm camera) for wide angle.
Posted 12 March 2003 - 05:58 AM
Dual Ikelite Strobes
Photo site - www.reefpix.org