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bolex double sprocket cameras


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#1 kevin jackman

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Posted 24 November 2010 - 06:58 PM

did any of the reflex cameras have double sprockets? and did they also have the 1:1 shaft?
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#2 Chris Millar

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Posted 24 November 2010 - 07:07 PM

as in double 8 ??

if so - yes
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#3 kevin jackman

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Posted 24 November 2010 - 07:17 PM

no sorry as in 16mm
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#4 Dom Jaeger

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Posted 24 November 2010 - 07:41 PM

No H16 reflex has double sprockets. All H models after serial no. 76471 (1952) were fitted with single tooth sprockets and the first reflex wasn't introduced until 1956.

The first 1:1 drive was added in 1964 to the H16 REX-4.

The Bolex Collector site has excellent information on the various models and their features:

http://www.bolexcoll...s/07_05_11.html

Andrew Alden's Bolex Bible is probably the best single resource for H16 information. It's available from his website:

http://www.bolex.co.uk/

(I am in no way affiliated.)
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#5 Chris Millar

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Posted 24 November 2010 - 07:57 PM

what for if you dont mind me asking ?
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#6 kevin jackman

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Posted 25 November 2010 - 02:24 PM

bummer
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#7 Simon Wyss

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Posted 25 November 2010 - 04:42 PM

The first 1:1 drive was added in 1964 to the H16 REX-4.

1963

Every Paillard-Bolex H 16 can be fitted with sprocket drums toothed both sides or one side, they are just screwed to the shafts. Bolex, Yverdon, has both articles on stock, and so have many repair people. Important that loop sizes are correctly set
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#8 Dom Jaeger

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Posted 25 November 2010 - 07:10 PM

1963


Ah Simon, "pedantry is the dotage of knowledge". My Bolex service manual has the 1:1 shaft installed from serial no 210600 on, which puts it at 1964. The revision page itself is dated 09.63, so they were probably manufactured in 1963, but not sold until the next year. To add a thrust to my pedantic parry, they are not actually a REX-4 but a late model H16 RXOV. The subsequent RX 5 model was so designated to identify it's magazine saddle. Thus the single turret magazine model was called H16 M5 despite not being the 5th generation.
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#9 kevin jackman

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Posted 26 November 2010 - 03:48 AM

ok well if anybody has some spare double sprockets lying around please let me know!
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#10 Chris Millar

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Posted 26 November 2010 - 08:49 AM

Did you read my PM ?

I'm interested B)

If you had a lathe or similar and a spare set of the normal variety maybe you could chop all of them in two and glue them together ...

Edited by Chris Millar, 26 November 2010 - 08:51 AM.

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#11 Jean-Louis Seguin

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Posted 26 November 2010 - 08:52 AM

Kevin, I can supply you as many double sprockets as you like but honestly I don't see the point.
Also, you may have trouble fitting them to a recent reflex camera as the teeth are very wide and can rub against the spring loaded film guides.
Sprockets on later reflex cameras are narrower. There are about five different versions of these sprockets guides over the years.

Chers,
Jean-Louis
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#12 Simon Wyss

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Posted 26 November 2010 - 11:05 AM

pedantry

Yes. I wish people would know about the positive side of pedantry. In Latin it means to go by foot. It has everything of natural rhythm, to walk lets us breathe, not breathless. I feel we all are in a deep need for our own pace. The speed-up is over, that was around 1989. And the drive is upwards again, gone is that decadent 20th century.

I have an H 8 Reflex, it must be just one of the first with the new housing: big base, 1-1 shaft, T-I knob switch instead of lever. The instruction booklet is accompanied by a leaflet on which the changes are illustrated, dated 1963.

It is not so important.
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#13 kevin jackman

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Posted 29 November 2010 - 03:58 AM

i actually want to try half-16
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#14 Chris Millar

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Posted 29 November 2010 - 08:26 AM

i actually want to try half-16

Did you consider what I had to say in the PM ?

If what I think you mean by half 16 is right then you end up wasting around the same amount of film in side cropping than you do in top cropping.

The next iteration on 16mm thinking is vistavision 16mm - but then you're looking at really short roll lengths ...

Answer = 2 or 3 perf/super/vista/scope 35mm

But like I said in the PM - it sure is fun playing around with formats and if you're after a 2.6666 aspect then its perfect

(quick, not quite right numbers: 4/3 becomes 4/1.5 - which is 2.6666...)
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#15 kevin jackman

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Posted 29 November 2010 - 02:05 PM

im actually not trying to have 2.6. once cropped it would fit 1.77 which is what hdtv is. i just want to play around with something that is between 16mm and super8. im also wondering if an h8 gate can be machined to the correct dimensions and if it would fit as a replacement.
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#16 kevin jackman

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Posted 01 December 2010 - 06:51 PM

im guessing then that i could temporarily transfer parts from a non reflex and use a modified gate to do this. does it sound simple and feasable?
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#17 Chris Millar

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Posted 02 December 2010 - 06:17 AM

i just want to play around with something that is between 16mm and super8. im also wondering if an h8 gate can be machined to the correct dimensions and if it would fit as a replacement.


Then shoot sideways ... 4/3 becomes 3/4 - mask half with a mattebox or at the gate itself - 3/2 equates to a 1.5 aspect, which you can letterbox to 1.77

No need to retime the rollers because you forgot to mark the tooth position with respect with the pull down then ;) (painful experience)
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#18 Chris Millar

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Posted 02 December 2010 - 06:19 AM

heck - even triple sideways mask/roll it if you want scope... you get:

2.25 aspect
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#19 kevin jackman

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Posted 02 December 2010 - 03:51 PM

I actually dont want 2.25
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#20 Chris Millar

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Posted 06 December 2010 - 07:42 AM

I actually dont want 2.25


I know - you mentioned that earlier - I also mentioned the following:

Then shoot sideways ... 4/3 becomes 3/4 - mask half with a mattebox or at the gate itself - 3/2 equates to a 1.5 aspect, which you can letterbox to 1.77


What do you think of that ? I reckon that aside from the shift (lens not centred) it's a workable option.

The 2.25 comment was for the benefit of those reading who were thinking about optimising film area usage for wider aspects in subframe 16mm.

;)

But my ideas dont seem to hold much water with ya huh ?

(?)
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