8mm Forum: Sankor 13-D anamorphic lens question.

»	8mm Forum » 8mm Forum » Sankor 13-D anamorphic lens question.

UBBFriend: Email this page to someone!

Author

Topic: Sankor 13-D anamorphic lens question.

Tom Photiou
Film God

Posts: 4837
From: Plymouth U.K
Registered: Dec 2003

posted May 02, 2016 03:15 PM

Not sure if it's me being a bit daft,(again),
My Brother has one of these with the bracket to fit it to his Elmo 1200HD. He uses the Elmo 1:1 lens and a 8 foot screen.
Its taken him years to mention this but no matter how hard he tries with this Sankor lens his image had bend at the lower of the image. I have taken a look and i am guessing that this lens is pretty much for a 16mm projector rather than a super 8 machine [Confused]

I myself use the excellent Iscomorphot lens i bought as a kit from Derann many years ago, this one is just perfect.
Here is the lens and also the bracker in place.

BTW, we had this lens cleaned internally by a photographic repair shop so the lens's are all serviced despite the gritty looking body.I personally think he needs to sell this one to purchase a suitable one for 8mm.

| IP: Logged

Steve Klare
Film Guy

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

posted May 02, 2016 03:26 PM

Hi Tom,

This is what I use for 8mm and I have no troubles.

I do have it much closer to the machine's lens, though. (When I run with a Eumig 800 series I often rest the front of the machine's lens inside the recess at the back of the anamorphic.)

-maybe you are getting some kind of vignetting?

You would think the 8mm image would be a smaller train to send through a tunnel and not so likely to hit the sides! (-Sorry for the railway metaphor, the cleanest one I could think of other than this involved geese!)

Mine is actually Royal Navy Retired: my old friend Tim Christian bought it for me over there surplussed at a really good price, checked it out and sent it here about 10 years ago.

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

| IP: Logged

Tom Photiou
Film God

Posts: 4837
From: Plymouth U.K
Registered: Dec 2003

posted May 02, 2016 03:56 PM

Thanks Steve, i shall have a little experiment tommorow night.(no puns intended [Big Grin]

)

| IP: Logged

Steve Klare
Film Guy

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

posted May 02, 2016 04:02 PM

I'd try to take it out of the mount and fly it manually!

-maybe try the 'ol books and bag o' rice trick!

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

| IP: Logged

Tom Photiou
Film God

Posts: 4837
From: Plymouth U.K
Registered: Dec 2003

posted May 02, 2016 04:20 PM

will do that, i think your right about it being too far away from the projector lens, the other one i use literally fits inside the outer frame of the elmo lens. Train in tunnel as you say. [Big Grin]

| IP: Logged

Maurice Leakey
Film God

Posts: 5895
From: Bristol. United Kingdom
Registered: Oct 2007

posted May 03, 2016 03:12 AM

The rear element on the 16D is 52mm in diameter and is probably for 16mm, however, having said that, there is no reason why I shouldn't work correctly with an 8mm projector.
So I agree with Steve, there is too much distance between the two lenses.
The Bell & Howell anamorphic for my 16mm projectors screws directly into the backing lens, and in the later days of 35mm scope projection the two lenses were kept permanently screwed together.

--------------------
Maurice

| IP: Logged

Rob Young.
Phenomenal Film Handler

Posts: 1633
From: Cheshire, U.K.
Registered: Dec 2003

posted May 03, 2016 05:40 AM

Yes, it sounds like the beam from the Elmo 1.1 is hitting the extremes of the 16D rear element.

The 1.1 lens will go pretty wide (11mm as I recall), so when set for maximum image size it will challenge most super 8 anamorphic lenses. Even my Kowa 8-Z has to be pushed right back so that the two lens barrels meet(KOWA 8-Z was designed for super 8, but still has a 52mmm rear barrel diameter and is very similar to the 16D), if you want to use the 1.1 at 11mm. But that isn't really desirable as you are really pushing the optics too far, even with these quality lenses.

So, either zooming the image smaller (which obviously you don't really want to do) or moving the 16D back towards the 1.1 should help. Bit of a pain as you'll need a new lens holder, but at least it should be solvable.

| IP: Logged

Brian Fretwell
Phenomenal Film Handler

Posts: 1785
From: London, UK
Registered: Jun 2014

posted May 03, 2016 06:39 AM

I'd add that the anamorphic looks a little lower than the projector lens which might mean the combination is distorting the beam.

| IP: Logged

Tom Photiou
Film God

Posts: 4837
From: Plymouth U.K
Registered: Dec 2003

posted May 03, 2016 06:41 AM

Thanks to all, i shall have a play about tonight and let you see how i got on.
Very helpful [Wink]

BLIMEY, I JUST REALISED WHAT A MAROON I AM, LOOK AT THE THREAD TITLE> [Frown]

| IP: Logged

Rob Young.
Phenomenal Film Handler

Posts: 1633
From: Cheshire, U.K.
Registered: Dec 2003

posted May 03, 2016 12:52 PM

Yep, I noticed that too Brian and it may well contribute to distortion on the lower edge of the projected image.

Not sure how Tom could adjust the current holder to move the 16-D upward a tad though.

Let us know how you get on Tom.

The 13-D is actually the very rare high quality version. [Wink]

| IP: Logged

Paul Browning
Phenomenal Film Handler

Posts: 1006
From: West Midlands United Kingdom
Registered: Aug 2011

posted May 03, 2016 01:37 PM

I have the isco lens Tom, also from Derann. I use it with the beaulieu 708 standard lens, but like every one is saying here it does need to be much closer to the projector lens. I do find though that when it is this close the lens, after a while in place the front lens of the lens on the beaulieu fogs up. I have not tried this scope lens yet with any elmo lens, so I've yet to see if this what happens too. An odd one.

| IP: Logged

Rob Young.
Phenomenal Film Handler

Posts: 1633
From: Cheshire, U.K.
Registered: Dec 2003

posted May 04, 2016 02:58 PM

Interesting Paul; it must be condensation of some kind?

Sounds perhaps obvious, but have you tried making sure the glass on both lenses are at room temperature before projection? Especially if the Anamorphic is kept somewhere cooler when not in use?

I've heard of vapour from prints fogging up the rear element of a projector lens. Actually, Keith Wilton noted this when running B&W prints on the CHC / Fumeo prototype all those years back and commented that he'd also seen this when running B&W prints on an early Beaulieu 708.

| IP: Logged

All times are Central

Printer-friendly view of this topic

UBB.classic^TM 6.3.1.2