蜂王：老的Flash有紫外！

2014-6-27 10:07 AM| 发布者: 星光| 查看: 4642| 评论: 9|原作者: waspking

摘要: Testing equipment: Panasonic DMC G5 full spectrum converted. El Nikkor 80mm F/4.5 old version. S8612 (1 mm) for visual, S8612+UG11 (1.75mm) for UV shots. Flower used: a species of soapwort (Caryophy ...

Testing equipment: Panasonic DMC G5 full spectrum converted. El Nikkor 80mm F/4.5 old version. S8612 (1 mm) for visual, S8612+UG11 (1.75mm) for UV shots.
Flower used: a species of soapwort (Caryophyllaceae) from our front garden (did not know it is so pretty in blue!)

All photos are not processed (not even for exposure). saved as raw+jpeg and I resized the jpeg to 1000 pix mag and uploaded them here. ISO=160, F8, most photos at 2 seconds, last one with my glasses 10 sec. I wait till the camera shutter is open and then fire the flashes via test button.

1. setup. Flash is situated about 4-5" from the right side of the flower. I put the flower on a piece of virgin PTFE so I can see if my WB preset (under sunlight) would work ok with flash also.

2. Visual color. all white.

3. UV, with modified Canon 199A per John's instructions (thank you!). I had to wiggle/pry a bit to get the cover off. Right now the bulb+reflector box has too much room and it moves a bit.

4. I then tried an non-mofified Canon 199A, since I bought two! and it gave some UV! enough for a shot. but it has a bluish tint. this should be able to be removed vial WB adjustment, I assume. I bought Photoninja last night but did not try it on this photo yet.

５.　I lost the beautiful blue though, after using photoninja to correct the tint. This is from the unmodified 199A.

６. I then tried my old flash. Promatic FTD 4500 AF, supposed for Minolta but I thought I used it for my Nikon FE/2020.
Yes! no tint and almost as good as modified 199A. I will stop my ebay to sell it!

７. I tried my Nikon SB600. no good! modern flashes do a much job in blocking UV? be careful with your old flashes... I did 2 tests and had a control (2 seconds exposure with no flash) and all three photos are the same. only one presented here (with SB600).

８. I then repeated the Promatic flash (just in case I made a mistake last time!), closer, and brighter, even brighter than the 2nd photo with modofied 199A.

９. So this means the UV blocks is not too efficient on 199A? Yes, it perhaps reduces UV by 50%, eye-ball test

１０. My pair of glasses with UV blocker seem to work much much better than the plastic UV blocker on the 199A!

Conclusion. we now have a cheap flash (similar price to 199A on ebay) that requires no modifications! I wonder if I burn the plastic whether the UV will increase 50% or not?
Another project.

收藏分享邀请

上一篇：蜂王：炉匠一回下一篇：吴友明：从新浪博客圈的名存实亡说起

发表评论

		自动登录	找回密码
密码			注册

蜂王：老的Flash有紫外！

最新评论

相关分类