8mm Forum: The Mighty GS1200

8mm Forum

my profile | my password | search | faq | register | forum home

next oldest topic

next newest topic

»	8mm Forum » 8mm Forum » The Mighty GS1200 (Page 2)

UBBFriend: Email this page to someone!

This topic comprises 2 pages: 1 2

Author

Topic: The Mighty GS1200

Paul Adsett
Film God

Posts: 5003
From: USA
Registered: Jun 2003

posted August 21, 2015 11:43 AM

Send New Private Message

Edit/Delete Post

The increase in brightness when using a 2 blade shutter on the GS1200 is very noticeable indeed. IMO the brightness of the GS with a 2 blade on the low lamp setting is about the same as a GS with a 3 blade on the high setting. I am very glad that I converted both my GS's to two blades. I just use my Eumig 810 if I need to show films at 18fps, which is not very often at all.

--------------------
The best of all worlds- 8mm, super 8mm, 9.5mm, and HD Digital Projection,
Elmo GS1200 f1.0 2-blade
Eumig S938 Stereo f1.0 Ektar
Panasonic PT-AE4000U digital pj

| IP: Logged

Steve Klare
Film Guy

Posts: 7016
From: Long Island, NY, USA
Registered: Jun 2003

posted August 21, 2015 12:10 PM

Email Steve Klare

Send New Private Message

Edit/Delete Post

I don't use my ST-1200 for 18 FPS, so I'd be interested in the two blade conversion.

I would imagine that would involve a whole new shutter wheel assembly since even though the wheel and shutter are two pieces, the wheel screws onto the shutter at three locations and now two of them wouldn't have a blade under them anymore.

It would have to be made pretty rigid since it is now a lot more "aperture" than "blade". Otherwise it could get noisy.

-of course this would just have to come only a few months after I restored the rubber wheel surface!

--------------------
All I ask is a wide screen and a projector to light her by...

| IP: Logged

Mathew James
Jedi Master Film Handler

Posts: 740
From: Hamilton, Ontario, Canada
Registered: Dec 2014

posted August 21, 2015 12:13 PM

Email Mathew James

Send New Private Message

Edit/Delete Post

I would be interested on this conversion on my ST1200 as well if it could bring it 25% more light... but I am more nervous and would wait until you tried first Steve [Smile]

[Smile]

--------------------
--
Cheers,
Matt 📽

| IP: Logged

Steve Klare
Film Guy

Posts: 7016
From: Long Island, NY, USA
Registered: Jun 2003

posted August 21, 2015 12:17 PM

Email Steve Klare

Send New Private Message

Edit/Delete Post

Just so hard to cut into a healthy machine like that!

My last great ST-1200 surgery followed a major meltdown.

-if I failed I'd at least have the comfort that it was circling the drain anyway!

"Where did your silver projector go?"

"Well,...I did the best I could..."

(The Service was very touching, and it's gone to a better place.)

--------------------
All I ask is a wide screen and a projector to light her by...

| IP: Logged

Dominique De Bast
Film God

Posts: 4486
From: Brussels, Belgium
Registered: Jun 2013

posted August 21, 2015 12:50 PM

Email Dominique De Bast

Send New Private Message

Edit/Delete Post

I'm not sure the ST 1200 can be converted. Following Wittner's site, the two blades shutters are for GS 1200, ST 180, ST 600, GS 800 but they added two words that following a tranlator could be something like "models alike". So, does the ST 1200 fall in that category (and then why not list it clearly ?) ?

--------------------
Dominique

| IP: Logged

Osi Osgood
Film God

Posts: 10204
From: Mountian Home, ID.
Registered: Jul 2005

posted August 21, 2015 12:57 PM

Author's Homepage

Send New Private Message

Edit/Delete Post

It's not an ELMO, but my old EUMIG 926, when I haven't run it in a little while, will have that sluggish start as well, but I'm pretty sure that it's all gears in the back and not belts.

Hmmmm, I just thought it was old age. Well, heck, probably nearly all of our beloved projectors are getting near needing a "walker" just to get around, (and probably some of us too, eh? [Smile]

[Smile]

)

--------------------
"All these moments will be lost in time, just like ... tears, in the rain. "

| IP: Logged

Mark Silvester
Master Film Handler

Posts: 282
From: England
Registered: Oct 2007

posted August 21, 2015 02:23 PM

Send New Private Message

Edit/Delete Post

Hi Osi

so whats' your point - Elmo shutter wise?

[Smile]

[Smile]

--------------------
Mark Silvester

| IP: Logged

Andrew Woodcock
Film God

Posts: 7477
From: Manchester Uk
Registered: Aug 2012

posted August 21, 2015 02:41 PM

Edit/Delete Post

The ST1200 can and has been converted before now to a 2 bladed shutter Dominique.

It differs only from any other shutter in that it is a wheel as opposed to a set of open blades.
It maybe would require a "beefier" peripheral ring with a thicker wall thickness to remain perfectly concentric whilst still having the ability to support the outer ring using two blades instead of three.

In a few places on this forum I have certainly read posts from a bye gone era of people who have successfully done this work. I haven't been able to find any examples from the archive so far but hopefully I will by delving deeper.

I remember reading whoever was the last to write about this work that by the finish, they preferred the PJ to their GS 1200.
I think that was a mag/opt HD model with a f1 lens upgrade.

It may also have had a 250w lamp upgrade also if I remember correctly.

Tom, in response to your earlier request within this post, I think the projector reviews are a great idea for Phil's mag but unsure whether or not there would be sufficient interested parties to dissect even the most common of the repairs on any machines other than the ST1200 or the GS1200.

I don't believe there are too many out there who try and carry out repairs on the other models. They tend to be sent to a specialist like Kevin Brown if the machine is suitably valued by its owner or alternatively thrown away and a new one purchased as they can typically be replaced for a few hundred pounds unlike a GS1200.

It would be interesting to find out first just how many people still regularly use a Bauer Studio line model, let alone those also that purchase Phil's magazine.
Then we could assess if the instructions would interest enough purchasers of the magazine.

[ August 21, 2015, 03:50 PM: Message edited by: Andrew Woodcock ]

--------------------
"C'mon Baggy..Get with the beat"

| IP: Logged

Dominique De Bast
Film God

Posts: 4486
From: Brussels, Belgium
Registered: Jun 2013

posted August 21, 2015 04:09 PM

Email Dominique De Bast

Send New Private Message

Edit/Delete Post

So, Andrew, from your message it appears that the shutter available from Wittner would not be suitable for a ST 1200. That's a good point to know.

--------------------
Dominique

| IP: Logged

Andrew Woodcock
Film God

Posts: 7477
From: Manchester Uk
Registered: Aug 2012

posted August 21, 2015 04:21 PM

Edit/Delete Post

No definitely not Dominique using the clutch/ rubber drive wheel arrangement that it comes with as standard.

If you can fit a direct drive from the motor to the shutter shaft using a correctly sized pulley and drive belt, then quite possibly.
Doing away with the clutch mechanism on these would actually be an improvement if the direct drive method was engineered well and the motor had sufficient torque to drive the projectors mechanism to full speed from standstill.

To be fair, all the direct belt driven mechanisms I have come across on 8mm projectors all tend to be D.C. motor driven but it's not impossible I guess.

--------------------
"C'mon Baggy..Get with the beat"

| IP: Logged

Joe Taffis
Phenomenal Film Handler

Posts: 1592
From: United States
Registered: Jun 2003

posted August 21, 2015 07:13 PM

Email Joe Taffis

Send New Private Message

Edit/Delete Post

I run both 18 and 24fps, so I'm happy with the 3 blade shutter in my GS1200...I think the light output at 15 feet from lens to screen is fine...

--------------------
Joe Taffis

| IP: Logged

Dominique De Bast
Film God

Posts: 4486
From: Brussels, Belgium
Registered: Jun 2013

posted August 29, 2015 04:48 PM

Email Dominique De Bast

Send New Private Message

Edit/Delete Post

I come back to this discussion because I had to open my Bauer T 502 for some reason and I noticed that the shutter has a variable blades positions possibility. It remains a three blade shutter but the blades can be enlarge. What would be the point of doing that ? I haven't the manual of this projector and never felt the need before but now I'm curious.

--------------------
Dominique

| IP: Logged

Andrew Woodcock
Film God

Posts: 7477
From: Manchester Uk
Registered: Aug 2012

posted August 29, 2015 11:58 PM

Edit/Delete Post

I think you may just have what they all have there Dominique, the standard arrangement on your 3 blade shutter.

If it is as standard, it provides a slighter larger 3 blade shutter in reverse as it does in forward by having extra pieces to the 3 bladed shutter that ordinarily in forward projection mode, sit behind the main 3 shutter blades.

In reverse, due to centrifugal force the extra sections swing out from behind the main 3 and give a larger shutter covering surface area and thus, a duller image in reverse.

This mechanism is to eliminate ghosting of the image in reverse that you would otherwise get due to the speed of the pull down down claw.

Once again, I thank Maurizio for explaining this one some time ago on here.

If it isn't like the way I've described and it has a thumbwheel on the shutter, then it may well have had a 2/3 earlier conversion.

--------------------
"C'mon Baggy..Get with the beat"

| IP: Logged

Dominique De Bast
Film God

Posts: 4486
From: Brussels, Belgium
Registered: Jun 2013

posted August 30, 2015 02:25 AM

Email Dominique De Bast

Send New Private Message

Edit/Delete Post

Thank you Andrew (and Maurizio !). I would never have guessed that. I have the standard original shutter, it remains a three bladed one even if you move the blades. I personnally very seldom project films in reverse this system is useless for me. I suppose when you convert your machine to a 2/3 blades shutter you looose that.

--------------------
Dominique

| IP: Logged

Andrew Woodcock
Film God

Posts: 7477
From: Manchester Uk
Registered: Aug 2012

posted August 30, 2015 04:27 AM

Edit/Delete Post

if you were to fit a variable shutter into the Bauer, when left in 3 blade shutter mode, you could use the projector in reverse in the same way you can now.

--------------------
"C'mon Baggy..Get with the beat"

| IP: Logged

All times are Central

This topic comprises 2 pages: 1 2

Move Topic

Delete Topic

next oldest topic

next newest topic

Printer-friendly view of this topic

Visit www.film-tech.com for free equipment manual downloads. Copyright 2003-2019 Film-Tech Cinema Systems LLC

UBB.classic^TM 6.3.1.2