Differences
This shows you the differences between two versions of the page.
| — | photowiki:filter [2023/01/07 15:19] (current) – created ying | ||
|---|---|---|---|
| Line 1: | Line 1: | ||
| + | ====== Filter Type ====== | ||
| + | * filter guide: | ||
| + | * all pro expensive one comparison: http:// | ||
| + | |||
| + | * UV filter | ||
| + | * Polarize filter | ||
| + | * Closeup filter | ||
| + | * ND filter | ||
| + | * color filter | ||
| + | * other filter | ||
| + | * Black card | ||
| + | * black card technique as traditional way of Photoshop-like masking: http:// | ||
| + | |||
| + | |||
| + | ====== ND filters and How Many Stops You need ====== | ||
| + | |||
| + | So when you consider a ND filter, there are mainly 2 purposes for it | ||
| + | - reduce incoming light, and be able at using f1.4 like lens wide open, when you already hit lowest ISO, like 100, and also hit highest shutter speed, like 1/1000sec, to achieve **Corret Exposure** | ||
| + | - reduce incoming light, and be able to use a extreme slow shutter speed like 10-20sec, after you already use f8 and ISO 100, to achieve **Corret Exposure** | ||
| + | - or combination of both | ||
| + | |||
| + | **Case Study** | ||
| + | |||
| + | * Situation 1: Bright Day Light and Wide Open portrait shot, (Ambient Light: EV 15) | ||
| + | * answer: at least 3 stop ND filter needed for this case. | ||
| + | * extra answer: if you doing flash fill, and you stuck with 1/125 sync shutter speed,then you need additional 4 stop ND to bring 1/2000 sec to 1/125, that is total 7 stop ND filter. | ||
| + | * extra extra answer: if you | ||
| + | |||
| + | ^ case ^ F ^ Iso ^ Shutter ^ note ^ | ||
| + | ^ normal correct setting | f16 | ISO100 | 1/125 sec | | | ||
| + | ^ max wide open setting with 4 stop Pshift | f4 | ISO100 | 1/2000 sec | f16-> | ||
| + | ^ max wide open with addition 3 stop ND | f1.4 | ISO100 | 1/2000 sec | f4-> | ||
| + | | | f2.8 | ISO100 | 1/500 sec | for f2.8 lens | | ||
| + | ^ stuck with 1/125 sync speed, means to use 7 stop ND | f1.4 | ISO100 | 1/125 sec | f16-> | ||
| + | | make ambient 1 stop darker than flash, means 7+1=8 stop ND | f1.4 | ISO100 | 1/125 sec | f16-> | ||
| + | | | f2.8 | ISO100 | 1/30 sec | f2.8 lens | | ||
| + | ^ if also with motion trail of background people, like 8 sec, \\ then it need to turn 1/125 into 20", means 8+10=18 stop ND| f1.4 | ISO 100 | 8" | 1/ | ||
| + | | if you able to stop down to f8, you just need 18-5=13 stops ND | f8 | ISO 100 | 8" | f1.4-f8, 5 stops | | ||
| + | |||
| + | * Situation 2: Night time (Ambient Light: EV 3) | ||
| + | * answer: Night is like a built-in ND for the sky, means it is 15-3=12 stops cut from day light settings. | ||
| + | |||
| + | ^ case ^ F ^ Iso ^ Shutter ^ note ^ | ||
| + | ^ normal correct setting | f1.4 | ISO100 | 1/4 sec | f16-> | ||
| + | ^ f8 landscape setting | f8 | ISO100 | 8" sec | f16->f8, 2 stop, 1/ | ||
| + | | 1/125 sync speed not affect slower shutter speed | f8 | ISO100 | 8" sec | no change | | ||
| + | | flash has no impact on ambient,\\ flash => portrait, shutter => ambient | f8 | ISO100 | 8" sec | 1 stop flash fill | | ||
| + | | for 20" or 60", 3 stops ND is enough or just blend 3 shots of 8" | f8 | ISO 100 | 8" | 8" -> 15" -> 30" -> 60" | | ||
| + | | ||
| + | |||
| + | **conclusion** | ||
| + | * for a f2.8 lens, you need 3 stop of ND is good enough for day and night use | ||
| + | * for a f2.8 lens with fill flash, you need 6 stop of ND to overpower the sun flash at wide open. | ||
| + | * for a f1.4 lens, you need at least 6 stop of ND for day time use, and 10 stop ND for overpower sun flash at wide open. | ||
| + | * 3 stop of ND is good enough for any night shots | ||
| + | |||
| + | ===== ND filter brands and naming ===== | ||
| + | |||
| + | * Haida Neutral Density Filters’ Factors: | ||
| + | |||
| + | ^ Neutral Density ^ Exposure Adjustment ^ Light Transmission ^ | ||
| + | | ND0.3 (2x) | 1 stop , reduces ISO by 1/2 | 50% | | ||
| + | | ND0.6 (4x) | 2 stops, reduces ISO by 1/4 | 25% | | ||
| + | ^ ND0.9 (8x) | 3 stops, reduces ISO by 1/8 | 12.5% | | ||
| + | ^ ND1.8 (64x) | 6 stops, reduces ISO by 1/64 | 1.0% | | ||
| + | | ND2.7 (400x) | 9 stops, reduces ISO by 1/500 | 0.25% | | ||
| + | | ND3.0 (1000x) | 10 stops | 0.1% | | ||
| + | |||
| + | * haida 6 stop and 10 stop ND | ||
| + | * review: [[http:// | ||
| + | * case: [[http:// | ||
| + | * note about Haida海大 price | ||
| + | * PROII级多层镀膜 vs normal (price increment factor) | ||
| + | * 超薄 vs normal (price increment factor) | ||
| + | |||
| + | |||
| + | * link | ||
| + | * Haida海大超薄PROII级多层镀膜减光镜MC-ND1.8 (64x) 49mm (琪琪摄影俱乐部) 128 [[http:// | ||
| + | * Haida海大超薄型 ND1.8 (64x) 49mm 中灰密度镜 减光镜 84 [[http:// | ||