8mm Forum: Elmo wide angle lens

This is topic Elmo wide angle lens in forum 8mm Forum at 8mm Forum.

To visit this topic, use this URL:
https://8mmforum.film-tech.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=1;t=009368

Posted by Baudime Jam (Member # 3509) on August 14, 2014, 10:35 AM:

Hello,

I hope I will find an answer around here !

My request is the following : I have an Elmo GS-800 super-8 projector with a lens that says : F : 13 - f= 15-25mm

The room where I can project my films is not so large : is it possible to find another lens which will allow a larger image on the screen and which will fit my projector ?

I am NOT looking for a scope lens : I am looking for a lens for standard film but with a larger image on the screen with the same distance between the projector and the screen.

Thank you very much for your help.
If any of you has such a lens for sale, I am OK to buy it !

Best regards

Posted by Paul Adsett (Member # 25) on August 14, 2014, 12:56 PM:

Baudime, I do not think that Elmo manufacured a wide angle projector lens. 12.5 mm is about as wide as any S8 projector lenses go. The Elmo f1.0 lens goes down to 12.5mm, as does the Elmo f1.1. Either of these lenses would enable you to get a significantly bigger picture than your 15mm lens. If that is still not wide enough, then you may want to try buying a wide angle adapter lens for a video camera, and placing this in front of your projector's lens.

Posted by Maurizio Di Cintio (Member # 144) on August 14, 2014, 01:24 PM:

Personally, I'd go for Paul's second suggestion which I can vouch for myself without reservations, having used it more than once: it's really effective and the quality is in no way inferior to using a cinemascope (albeit for a different reason). Just think with a 0.5x lens add on for any video camera you will half the lowest focal length of your lens which will result in doubling the screen size. AAnd if it's too much, you can always zoom in the projector's lens. Just find a big enough one and tinker with some way to keep it in front of the lens.

Posted by Fabrizio Mosca (Member # 142) on August 14, 2014, 01:55 PM:

INMH, with the GS800, due to the 100W lamp, maybe it's better Paul's first suggestion.
The point is that with a bigger image you also get less light on the screen and so, If you add a wide angle lens adapter in front of the projector, your light loss will result both coming from the wider image and the adapter absorbtion.

Posted by Joe Taffis (Member # 4) on August 14, 2014, 02:50 PM:

Baudime,
I sent you PM [Smile]

Posted by Winbert Hutahaean (Member # 58) on August 14, 2014, 08:12 PM:

Baudime,

I am just repeating what I have experimented in the other thread:

quote:

1. A Sony wide conversion lens x0.7

2. Emergency attachment with cellotape

3. Area for screening

4. Screen shot (Tom & Jerry "Texas Tom", Red Fox print)

5. To give you the idea how big is the screening picture, I am standing in front of the screen. I am 175 cm (5 foot 9 inches) yet I still need to raise my hand to reach the top of picture.

This is what I got with my throw distance at 4.8m (15.75 foot)
Projection at 12.5mm (height x width) = 2m x 2.66m (78.74 inches x 104.74 inch)
Diagonal length: 130 inches
Brightness: Decrese by 10% (but then I compensate by switching the light setting to high instead of low)
Sharpness: no change

Further discussion can be found here: A lens you need for short throw problem

UBB.classic^TM 6.3.1.2