WEFERENCE LIBRARY
12 APR 1975
-育教圈影攝頁一第張五第
日二初月三年卯乙曆夏
WAH KIU YAT PO
郭日僑業 CITY HALL
日二十月四年五七九一屦公年四十六國民華中
圈影攝
兩種新款彩色濾鏡
1.
子青
一變複影的方向,不過你
郝念其發明人意大利科 浪苻督學』遽籠,取名
[[乃利用艾文科學公司的片是没有優裾,不可以 就更能帮助你漪押你的上,但我們可以把它裝
科學-眷如本文所介紹 新者称四十四美元,後 「才固定在臺前。
的我幅宮創作性點片,一者十三美元。這班建常適合了,我們又可以 月一天地,你仍不得杯冰沙,兩者價格相距很大,大約比讀數較低一光圈 如集你熱愛,開關新 定,不過有點亞生意的傳說,她果使照片大部 玄妙定義。但到來,細價,如射在了裤为表而引致過份 對藝術下一個甚抽銃 梅救中。這種注鋭湯有,在很多體况下會「救 發表甚獲世類,艾威者 把一些黑色物質與棉在 影像的對比。如此, 妮卡彭專家就亲形诚而核刻他在玻璃片後,再 而已,因這種试镜可蔟 -你可以向甚麼宗師一條。利用化學藥水把線,則共護廠可作公考 |光節可直接根據
「把相攢之茆林速度較快 「讀數指示了。這聯法息。小而增減。 全自動的,不能用人是爲「星光;可五十及二百五十等,但下 巫烈事物,最能拍出类乘四发二分一吋菲林片
新產品。有了新工具,直接在富的姊維牙一倍,譬如 ASA64 當樂。這樣的商可以放 對明銳度有多少影响,一購分部品。 條分明港作爲萱成校街一尺吋。如果前後以不骇 有其他全射光柵片,可一品——該都會士篇漸 爭開模者。至於題村選,以產生全光折射光效果以II贷最佳。「基爾有高後會去光變成萬顆流長,那 一可籍于辐射狀皮士A HKCC 健麋天職是拍於該國, 在也很實翼,光時對比象,藏康站四又二分光疆 浦成績。以主題特魔樣似的。可以難期到所之折射光圖案,不過也,兩項,5,考試進一骨加不少就離复活。” 有多的;时五,欲加者,請及早準備 整公司另一所產品與八十一百卅三、一百佳作。茲將辦法簡述如 內燈光安輝。(下) 低頭再一吓「浪號將本月四月(7) 一也可能注意到一做就古,但實際是可忽略不計。一年我第一次名出發影效果使人在視覺上產中 利用「風光倦一拍
品。窗外的太陽光與眾
香港大樂攝影會本█個媽虹光著招牌,比賽, 生特殊美感。有基巴黎
左下杀接演
年 ASA125,ASAZ5
極像力。新產品名為一,在導賞他就上,然後 “ASA50來發特,則澡複影的數目不因光圈大 宗楚客J錢,枝紋格應商啟止報名,各影友如 到母院的古典手HIN
學家RONCHI RULING遭統之使用,有些技術 『教谴繈實際得一塊玻一檢雕仙榭在此一摭 瑞片其上有不不姊線核,首先低爆光吧,如深 其密度易桀叶有三蹺,所用的是往後鄭光系
: 關於「浪嵛麼方便一些相接,其曝光
光長爽爆
,在顯景框有愛不同放一比轳好用,雖然理論上一來作實驗,十分有趣的十二張,題材不爽。查物或 ,同時不妨把鏡菀轉動,裤片夾成三文治形式·一拍出不同形狀圖案,開一片共十五張,北者骤可向下列各代收樂作品 一 或黑白照片或彩色幻燈
幹或索取表格, 龍報攝影器材陳志願。 港出症 旺角亚皆老街六十四號 郷普通会员瀅一年者。 德輔道中其昌大厦嘉腾 永進會員或已交足貨菇 七六八號。(11)中进 1)投考者須爲該會之,郵寄香港上鄭籍三
攝攝
攝影藝術
香港大衆攝影會舉行
十一週年紀念聯歡會
·香港大余攝影會成| 抽獎方面,該會現已緻[集安當時】公佈。發
星
將定本月〔四月二十[品败百份-其中包括有 卅分,假座中登褾講道 出之國名廠電子相攤,購券地點:一 日(星期日)下午六時大會主席陳櫙彬先生潑售,定居位港幣二十元 一年度新委员就職典禮, 器材商號,捐出名爾獎 之影友保證永不落空。 ;坔舞現已開始發 中二六七號龍記飯店1·一部價值千多元,而主 璐微鏞中其昌大厦易之聯系,促進文化交流 - 特邀箭息架坡名攝影
旺名
任
拍,你不断
是要主棄也
才真正恢復個人自由,本人十分亭受這種樂趣。 」 旺角會駐星代表 衛蘭純自己內心變動圖演當失分发票出來,所以開來看过,
仝親友參加。:
旺角影合爲加强會對東南亞各地攝影
·主持人再間一個有邀問題:「如果你目擊一項意外悠廳,酒見人受
,包括燈光入級攝影 百份- 及七五年建各新,旺角亞皆老街六十四號式已於月前於星淵覺得校舉行,由旺角食商及到
·核晓修百十分豐富,病根先生之名貴藏。 雖五金優德橋・(U)會士,對推動星剛攝影藝術,極有貢獻。委任儀 决定了 畫染行,敬迎各影友機 席選美蓓先生之名貴法,隨掖彭器材設學,(二種愛,任該會臨風劑之海外代表,或若含星米,垂危,你會首先拍影,問明對方姓名、地址、及其餓難情,然後才救人驚 國食或高速煲兩個,李,中現永吉街十七號萬、東南亞緻影學會之創辦人,英皇家攝影學會高級?」該位沉者很巧妙包答此類題:「这就要腿乎當時我的良知良能反爆而人
· 放映機,攝影器材等
影 - 但不會使影性整形。 *本寧」三百觀建媺拍的。像的數目不受光盘大小之影响。 左圖)这幅照片乃拍於巴黎-利用「浪奇魯亭」溏傥,該處做流復。啟會將在全部獎品收 五十人,故爲免向隅, 右明圖左方是沒有加上建鏡拍出的一支出血照明缀,右方基加了「浪公司所選出之各種相機】5 修頓青年中心
及幸運抽獎,至於幸萬物。上述獎品(四 油麻地佐敦道送|地間之精彩。 並未包括各大攝影器材,船街龍劑攝影器材分店 香港大衆攝影會:[ 宮頸鮭位結影,營銷,一番风滋出之名段證基百一放源攝影器材陳志腿,就較為委託出予版社,期君亦表示將靈力促進各悄麻木,所以他配爲暴踉帶來人間歡樂-高美多拍一點邪色模齢低隔塲面 談到攝影風格問題,該位攝紀近日人們見得太多悲慘照片,逐漸感
,而喜實這證明受歡迎的
設攝影研究班
「
叉因座位只二百
之需求 特開設攝影研究班 歙迎十五歲至廿五, 遗黑房投術及各種特技之攝影,並矯正攝影者常 一對攝影有興趣而有研究之男女爭參加,內容注 佐醌青华中心之攝影祖,爲馬慶大杏年朋友
如下。 過直選之後,各部門之委員經已誕生,效與公佈 直,經於上月法會之會爲同人大會中選出,並經 . 奋港大衆攝影會一九七五年至七六年度新委
因莫榮光,中文秘書龍桂培、可飆股全,節目 會長陳志強、副會長潘根、關彼得、英文秘
陳志聰榮任會長
選出新委員名單
連貫,亦緻迎有興趣者參加。 郭俊雄先生負質,初級組及高級組均習為男實習,但梁牾章、陳泰俊,祂務關苴狱、葉昌、會員祖 主任邱楊明、灯光組黃志,委員陳菊、中
三個月共卅六元,導師仍由初級紙及高級導師,學術主任鹊、名銜考試主席常惠 會刊胡 「犯的籃誤等等,該組逢星期一晚八時開始,全期 主任吳文、月变主任黄志勤、沙龍主席方梓其
參加者請帶備照片兩張及身份,在辦公時 至九克牛》到灣仔軒尼斯菹修頓球壋福利大厦地 一間內八運星期一至六,下午二時至五時,晚七時
四一三七。 .│ 下(近家廣計劃指導會)報名,查詢會話H—七二、陳銘Ä獎章、吳程玉湖、任窗等捻名譽顧問
梁、高柳堂、麥柱發、梦美、梁光明、陳阿彬 教師。李燈正、弘毅倧名譽法律顧問。出们 除上述委員外,他會並邀請活永祥出任撂名
針孔鏡頭有趣效果
·得成就,可以由六时地方
至無食物都同表清晰 「針孔」拍攝,可用
實驗,首先拿一部可換鏡頭的相機,把洗頭除去 磁設計透鏡可比的。談到格方面當然更「蚊 妨用0.25MM。要量團針孔大小,那就要借助款 老針孔「镪頭」,其中某些優點,仍然非目前最。但一般來說可用 0.05MM至0.5MM,初试不 「多盡善盡美,但誰起來有點令人意外,最原始「針孔」大小,得出不同效果,視需要而决定 "目前雖然光學器材十分進步,銳設計躉不, 運辦法,多試幾次,你就會知道正確曝光時間
| 攝了。首先你會發覺「針孔所做成影像依據針 有改善。 风有没有谢光,中央用針刺孔,那就可以開始拍 果不想這樣,刺孔時錫紙背後墊以木塊,這樣會 。留下的缺口用錫紙封口,再用膠紙貼邊,然後纏足以引起光纁散射,有「星光鏡」的效果。如
【真牛胛」了,我們可以試一些「針孔」旗明作,大正通常有以要性。
#易光
在針孔邊角地力,而使影像桅得做糊,但太大的 降需要受到半分鐘,所以宜用三脚架支承。 是有一個限度,但太細時就會產生折射作用,特,因眼眾威明上蓋以黑布,比較容易跟石,屬光 吼大小而過得清晰,似乎越細,影像越潸,不過紅面觀囊据內才女,有時被外面光影响,可用模
【造没有焦點平面的,所以針孔與菲林距離多少都
福會成像:利用此優點可調針孔距離而使影集一個質的嗜糖類有一個優點,凡要在貓紙面
正 你通過一個鐵絲網拍日落景,那麼所
光綉都在同一平面成。對孔「佛」有極大救
限
蛤
廠活針頭
- 支素阿
甜拍可。經可選果見孔惜初而時
果紙田拍光用機。時助然决間月
教僑
化學科(廿二)欧波杰
UHEMISTRY (#22)
Solutions for Chemistry (#21)
1. As hot concentrated hydrochloric
Bold is a reducing agent, the rea-
to
be
ction with X with evolution of aks greenish yellow gas (likely chlorine) suggests that Oxidizing
not
in water and dilute
a salt or a
Balta.
Finally the aha te maok
and
powder for strongly
Buggest that it is the well known.
Once
I
with 1 and heating
ent manganese dioxide.
So yellow gaa (chlorine),
dioxide) and con-
sulphuric acid also yield
:contain. the chloride anlan.
As Y is deliquescent, this is a
chloride other than sodium or
lm, and the absence.
of colow the possibility of many transition metal chlorides (e.g. iron
nickel). pobalt
Since the Y yielde no precipitate solution of Y
sulphide gas in
pascing
food sulphide must be
Roid
However, the forat- lon of white precipitate in aliml medium does imply that Y contains a cation species that forms an inab luble sulphide.", Basing on these chamoteristics, T io likety to ba zino chloride.
The reaction of X, Y and concen- trated sulphuric acid is as
follows
+2C1
The reaction of X with hot con centrated hydrochloric acid is similar to the above reaction.
Y is deliquescent, and on heating would readily yield a bag14. chloride. MANAG
ZnC1+H0 -> Zn(OH) C1+HOT
In alkaline medium guch as ammonium-hydroxide, a solution of Yfirst yields zino hydroxide as a precipitate that in readily soluble in excess ammonium hydroxide by complex formation to the tetraaam-
Zn01, 1208 → Zn(OH); -201 2n(OH)2+4TH OH (Zn4NHL)(OH),
+4Hyd
This Za complex fen may be precipitated by hydrogen sulphide;
Zn+ IL3 203 + 2H
2. As the orgando aoid giving x180TM
to the silver galt is a tribasic
avid the salt would have
all three
of the replaceable. hydrogen atoma replaced by the silver oms.
Weight of the silver salt used in the
won experimen |= 12.354g-11. 020g =
יני
示
·During ignition, the organic acid.
radical part was completelyoxidized
yielding carbon dioxide and steam
both of which are lost to the atmospherewet
The weight of aiiver that remaina
as the residue in the crucible,
11-861-11-020g = 0.8418. The
"weight of miver in
10gns atomic weight
As each g-mole. of the silver alt contains three ga-atoms of silver, the g-formular weight of the silver palt,
(1334 x 107.9 × 3)6
=513.5g.
The gm-ion weight of the organic acid radical
= 513.5 - (3 x 107.9)8
189.8g
Thus molecular weight of the tribasic acid
⠀ - 189-8 + 3 = 192.8
Questions for. Noxt Week
Multiple Choice. Section
1. meatone is soluble in
A Distilled water
B. De-ionized water,
G. Rainwater D. Limawater
E. None of the above.
When two or more identical
molécules unite together to give u
single molecule with similar chem acal composition, this is known as
A. Dimerization
9. Allotropy
C. Isomerization
D. Folymerization E. Catalysis
3. When aheap samples of common
alt becomea wet in humid weather thia is because
A Sodium chloride is deliquescent B. Potassium chloride in deliques- n: cent
chloride is deliques-
白
C. Magas
cent D. Ammonium chloride in deliques-
cent Sodium chloride is efflorescent
4. The following reactions are all affected by light except
A. Reaction between chlorine and ......;ethylene,
ascetween iclordne and B. Reaction between
methane G. Reaction between chlorine and
shydrogens D. The
darkening in colour of ailver chloride
E.Reaotion involving water and.
carbon dioxide in photosynthe- aizing, green loaves.
5. The following compaunda yield' the same gas on strong heating except:
A potassium chlorate
B. Lead nitrate -
d. Ammonium nitrate.
D. Bodium nižiuta
E. Hydrogen peroxide
Conventional Questions:
from the
1. A sample of the residue action of a limited amount of sulphuric acid on crude common salt contained 'oodium sulphate, sodium bisulphate, sodium chloride and a and arount of insoluble matter. Three 0.500gram samples were taken and treated as follows:
(a)
Titrated with exactly decimolar
golution to the Bodium hydroxide ̇methyl orange end
29.17m1 points
Pof alkali required."
(b) Pitrated with 0.058
silver solution,
ion, of which 10.00ml nitte was required for complete precipit tation of the chloride. (c) Treated with excess barim
chloride; the precipitate, when washed: and dried, weighed 0.8428g. Calaulate: the permentage of the anhydrous salta present in the sample....
2. Because the number of carbon compounds is so great, many organic chemists believe that carbon forms more compounds than any other element .
Without an extensive
search of the literature, how would
you convince such a chemist that
hydrogen deas indeed for more
compounds than does carbon?
物理科(廿二)·吃示嫌·
安$10(#223
Solution
1(a) A projector lamp, mated 1000K and 200v., emita 1000 joules per second when worked with a main supply of 200 volts.
(b)
Ammeter A reads.
The current pasa- ing through the Pilement. volt-
metary indicates
the .d. across
the lap.
ohms.
OR Current inckt.-
200
40+3200xx
Fede acrOBS 400m
20V10 m2ts:
200-20√10. -200-63:247
136.76 volte
B-86.5 cha
-B=40(√10−1) = 40 x 2.162
66.48 chap
(d) 100uma p+3OOV
toma
Jurrent in B
potential at G-OV
100 volts CG
100 6
12x10-3
ohm
(b) 3 at 100*0 = 9.81 x 10
Rat:100°C = 5
Rá
where (length) and A (omogo- seotional area) are the dimensigna .of.the. platinum wire assuming (f) ohas 18 constant, am
ZRA
-8.37 K
180
1 OK 2300 volt畑
300 60x10
-
5
1,000°0
9.81 x 10
-21.9 ohme
ohma
RS() (43x10
(9.81x10)
(100-60) ms = 40 ma (c) Resistance of ooil,R
= {300-180) vdite
120 volte
=
120 40x10
= 3K
Current in R2 = (40–19) ma 22 ma
= (180-T00) volta
Btentat R is ad- Current
justed to ensure
Rh. a p.d. of 200v
read on the volt- meter.
Y1000 If the ammater read日 I === 200
the rated value is correot. (c)
P=100w
5A
= 80 volts
00
K = 3.63 K
123 = (22-12) m2
co - 130 volts
2
R3 100K
The value of the wafatom-
R3K
·R2 = 3.63K
R=10K
Renistaron of the ({K=10000lms)
filament remA LIS
constant。
Since P?
:100=2002:10001
V2 TO x 200
63.24 volts Resistance of filament:
R = 1000
200--40 ohmo
R = 5K
HOR R=0.33K
Resistivity oť #re, S = Thioknada of wire, A2 0.25 m
62
Length of wire
(4) Volume of cube"=") Cross-section), area of Length of it, A = 20m
Resistivity S.=
A 2×10-6
102 = 10 m The mibe in wale in a conduct Length, A' = 100m Cross-sectional #rok, a
Registros R =
_103 – 12.5
(e) Copper wires
RELAT
负
Cross-section A on
SaG. 7.81
length door om:
ad.(equal mean)
quz (scime thicknes
Volume =
Questions fox nak
8.9A
1. (a) Draw a labelled:
x10
agra of a
Daniell coll Explain what happena
at the mufase of the
l rode of the col1 Wha
though; the porojin pot7 What
happens at the surface of the cito zod?
Two Dinis oSLIE are placed. In t Beries" and are con nected th a volt- meter of very high resistance ag shown In the diagram. "The reading des taken, and then Switch A 13 closed so as to
Jonecte 10-om resistance in jarallel with the voltmeter. The rending then falls #rom 2.2 volts
2 volta.
(1) Explainly why there is
a fall in the reading on the
Caloulite
the new rend Ang
(14) Catch B were now to
be ulosed-oes, to include a second :10 oma: ahudatance te paràl~ 11 with the first.
(a) A 200 volt, 25 watt light bulb. and a 20dolt 50watt lightbulb are gonnected first in paa1107) then in somes, with a 200 volt aupply. ́ ́ Fescriba'
what would be seen, teme
Calcuin.th, the aleotriosi emergy: blob would be consumed in each oane vithin one hour. (assume tha realstame of light bulbs to be nonstant whether potà or hot),
shows a simple form of van de Graaff generator.
(1) That is the
function of the high tensiou: “