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  #1  
Old 10-06-2017, 05:13 PM
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FP flash bulbs/lights

There where some type of flashbulbs that allowed some cameras that have slow sync flash speed to use sync speeds up to 1/500 or 1/1000 seconds. How can you make the difference between an standard Magensium bulb and F.P. one.
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Old 10-06-2017, 10:34 PM
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The bulb packaging would have a type number including the letters FP, like "FP-26". I don't recall for sure if the bulbs would be marked individually, but I think they would.

Here's a place that lists some types of bulbs:
http://www.flashbulbs.com/ClearBulbs.htm
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Old 10-07-2017, 04:23 AM
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But can I put such bulbs in every flash unit that can fit them or do i need a special flash unit?
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Old 10-07-2017, 10:23 AM
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You can use them in any flash unit they fit into. The only important point is that to use them with a short duration focal plane shutter, the camera must have the correct sync timing (M sync). Two things cooperate in this action:
1) the shutter slit opens and starts to travel after a short delay to allow the bulb to reach full brightness
2) the FP bulb maintains full brightness for a longer time than a regular bulb, allowing time for the shutter slit to travel across the whole image
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Old 10-07-2017, 10:32 AM
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The GE brochure on this site shows the difference between regular and FP bulbs:
http://www.flashbulbs.com/flash_info.htm
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Old 10-07-2017, 11:26 AM
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I will study more that site.
I have an "Minolta" SRT-101 with FP connector.
But it's strange that I've seen that "Sylvania" was saying for they bulbs that FP comes from something elese.
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Old 10-07-2017, 05:01 PM
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Sorry, I confused M and FP bulbs.

The Minolta manual shows the difference in shutter speed range on p.31:
http://www.cameramanuals.org/minolta...ta_srt-101.pdf

If you download the manual, you should leave a small donation to support the site.
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Old 10-07-2017, 06:46 PM
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I know that site. That's where I found about the F.P. flash bulbs.
I'll make a donation when I will have an bank account or I will put money on my "Pay Pal" acount.
But is the "Philips" FP5B a normal F or M bulb or an F.P. bulb? http://www.flashbulbs.com/Philips_ph-1.htm
I found for sale the FP5 version... probably only for black and white films.
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Old 10-07-2017, 07:28 PM
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Look again at the Philips page. I think you made a mistake when reading. It says "PF5B", not "FP5B." I think "PF" stands for their trademark "Photo Flux," or "Photo Flash," not "Focal Plane."

The light curve for the PF bulbs is very peaked, not flat-topped like a focal plane bulb.
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Old 10-07-2017, 07:32 PM
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Also, the FP5 is probably a clear bulb? So it would not be for color film requiring daylight color.
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Old 10-08-2017, 04:07 AM
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Yes, my bad, it's PF.
So the light curve must be like the one from the 2 diagrams from the low right of this image: http://www.flashbulbs.com/CrPDwnlds/FlashInfoPdf2Sm.gif
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Old 10-08-2017, 11:35 AM
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Quote:
Originally Posted by Telecolor 3007 View Post
Yes, my bad, it's PF.
So the light curve must be like the one from the 2 diagrams from the low right of this image: http://www.flashbulbs.com/CrPDwnlds/FlashInfoPdf2Sm.gif
That is correct.
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Old 10-09-2017, 12:10 PM
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But generally speaking, bigger bulbs (not as big as one with E27 screw mount) had more power then small one that didn't had theyr own socket, but in stad 2 wires getting outside (I have about 20 with that wires...).
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