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12-13-2010, 12:13 AM   #1
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P-ttl ?

Hello B&H,
I am looking at a "Digital Concepts" flash unit for Pentax in your online store. This is the item number, B&H# DI918AFPEN Mfr# 918AF/PEN .
My question is---Does this flash do P-TTL?
It says just about everything in the description except P-TTL.
Here is the description from the page;
"This Digital Concepts DSLR Bounce Zoom Swivel AF Flash for Pentax gives you an affordable, full-featured flash for your Pentax DSLR. This flash has auto focus/TTL metering, automatic shutter speed setting, a focus-assist beam for low-light situations, a reflecting plate and wide-angle diffuser, and a zoom function with settings for 0, 45, 60, 75, and 90mm. This bounce zoom swivel head offers a horizontal swivel from 0 to 270 and vertical bounce angles of 0, 45, 60, 75, and 90. "
Dedicated flash designed for use with Pentax cameras
Auto focus/TTL metering
Red-eye reduction
Automatic shutter speed setting
Focus beam to assist in low light conditions
Includes reflecting plate & wide-angle diffuser
Zoom flash head from 0/45/60/75/90mm
Guide #38m at 85mm zoom position
Horizontal swivel angle: 0 to 270
Vertical bounce angle: 0, 45, 60, 75, 90
Operates on 4 AA batteries (not included)

Thank you in advance!!!

12-13-2010, 08:15 AM   #2
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Hello,

My experience with after market flashes, especially in this price range is they will work in TTL meaning what the camera determines is the correct exposure the flash will output. No automated or advanced featurers such as wireless operation or auto zooming is to be expected.


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12-13-2010, 02:08 PM   #3
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Hello Chuck,

I don't think you've answered the OP's most important question. From his message, the descriptions on B&H website does say TTL, but does not mention p-TTL. The spelling may be similar, but they are very different.

To the OP, this thread may help answer your question(s) about this flash unit.
12-13-2010, 02:50 PM   #4
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Hello,

TTL will work. Advanced features of P-TTL I doubt. Many in expensive third party flashes behave differently on different bodies. There is no way to know for sure what will and will not work unless it is used on a body. I've had some sucess with a Sigma EF-530 DG flash, but get incorrect exposures in tricky lighting. The unit has no onboard controls and there a few options via the body. This is one of resasons why using a dedicated manufacturers flash is the better choice.

Chuck

12-13-2010, 05:41 PM   #5
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Since only the *istD and DS/DS2 support TTL, it sounds like this flash isn't the best choice for DSLRs. Try the AF360 instead: Pentax AF-360 FGZ P-TTL Shoe Mount Flash 30333 B&H Photo Video

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12-13-2010, 06:05 PM   #6
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Adam and Chuck,

I'm confused . Fortunately I'm not looking to buy a flash.

- The description on B&H's site says "Auto focus/TTL metering" but does not mention p-TTL.
- Chuck says "TTL will work. Advanced features of P-TTL I doubt." but does not say anything about the basic features of p-TTL.
- Adam says "only the *istD and DS/DS2 support TTL, it sounds like this flash isn't the best choice for DSLRs," but does not say whether the flash supports p-TTL or not.
- The discussion thread (link in my post above) says the flash does support p-TTL.

12-13-2010, 07:09 PM   #7
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It's a dubious flash - good reason why a straight answer is hard to give. Apparently it is P-TTL according to a couple of users publishing their results with the flash on dpreview, and is indicated vaguely on some eBay ads that it is P-TTL. Check where soldbear mentioned::

https://www.pentaxforums.com/forums/pentax-camera-field-accessories/49880-dig...ed-tested.html

and here: https://www.pentaxforums.com/forums/pentax-camera-field-accessories/14405-digital-concepts-program-ttl-flash-pentax.html

I purchased a 7 series predecessor that claimed the same P-TTL features from an eBay guy and turns out it was definitely NOT P-TTL. That's why I'd steer clear from this brand.

Why not spend just a few extra $ and get a much better flash such as a Sigma EF 500 or 530 Super or Metz 48?
12-29-2010, 08:45 PM - 1 Like   #8
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Chuck,

I don't mean to be rude, and I appreciate you and Henry coming here to answer questions, but I think that your usage of the terms TTL and P-TTL are only adding to the confusion.

TTL is a term normally used to refer to the system used on Pentax FILM cameras (and a few early Pentax dslrs), in which the flash sensor is built into the camera's mirror box and reads light reflecting off the film (or sensor) to determine the correct exposure.

P-TTL is the current flash metering technology used by Pentax, employing a preflash, with the reflex mirror down, to meter the flash using the light cells in the viewfinder.

IMHO, the term TTL should NEVER be used when referring to a current Pentax dslr, except to say that it isn't supported. Earlier in this thread, you said "TTL will work. Advanced features of P-TTL I doubt." To me, saying that a flash supports TTL means that the camera must have a flash sensor in the mirror box, which no current Pentax dslr has, and that it DOES NOT do a pre-flash. If the unit does a pre-flash, then only the term P-TTL is appropriate, even if it can not do more advanced features, such as wireless remote control.

BTW, the same confusion is true of Nikon and Canon cameras and their i-ttl and e-ttl flash control systems.

01-05-2011, 03:32 PM   #9
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QuoteOriginally posted by noblepa Quote
Chuck,

I don't mean to be rude, and I appreciate you and Henry coming here to answer questions, but I think that your usage of the terms TTL and P-TTL are only adding to the confusion.

TTL is a term normally used to refer to the system used on Pentax FILM cameras (and a few early Pentax dslrs), in which the flash sensor is built into the camera's mirror box and reads light reflecting off the film (or sensor) to determine the correct exposure.

P-TTL is the current flash metering technology used by Pentax, employing a preflash, with the reflex mirror down, to meter the flash using the light cells in the viewfinder.

IMHO, the term TTL should NEVER be used when referring to a current Pentax dslr, except to say that it isn't supported. Earlier in this thread, you said "TTL will work. Advanced features of P-TTL I doubt." To me, saying that a flash supports TTL means that the camera must have a flash sensor in the mirror box, which no current Pentax dslr has, and that it DOES NOT do a pre-flash. If the unit does a pre-flash, then only the term P-TTL is appropriate, even if it can not do more advanced features, such as wireless remote control.

BTW, the same confusion is true of Nikon and Canon cameras and their i-ttl and e-ttl flash control systems.
Good clarification! :bigthumbsup:
01-05-2011, 03:38 PM   #10
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QuoteOriginally posted by noblepa Quote
If the unit does a pre-flash, then only the term P-TTL is appropriate, even if it can not do more advanced features, such as wireless remote control.
Just for the record, wireless remote control does NOT require p-TTL mode.
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