A1 + Letus35 FE Test Footage/Notes

Blake Calhoun · July 15th, 2007, 09:53 AM

Same 1/48th shutter speed was used on both, yes, but we closed the iris as needed to match exposures with the Letus adapter off.

For example, with the 28mm lens on and the Letus we shot at F4, but with the Letus off we shot at F7.3. These f-stops were readings from the Canon A1.

Hope that answers your question.

Damon Roger · July 18th, 2007, 10:17 AM

Thank you Blake,

Great examples! Its interesting how the colors change and look more organic with the adapter and lenses without any extra tweaks...

Yow Siang · July 18th, 2007, 07:23 PM

Hi Blake,
I like to know once you have the adapter on and fixed on the 24mm lens. does it give you much wider view than the widest side of the stock A1 lens?

Thanks
yow siang

Blake Calhoun · July 18th, 2007, 09:50 PM

Yes, the 24mm is definitely wider than the fixed Canon lens. Not sure by how much exactly though. I beleive the A1 lens is roughly a 30mm (in 35mm equivalent values).

Of course the best thing is you can easily get the shallow DOF look even with the wider angle (with the Letus).

Yow Siang · July 19th, 2007, 01:46 AM

thanks blake am so happy to know that.
As i am asked to do some interior shoot and glad to know i could use my nikkor 24mm lens and need not buy a seperate screw on wide angle adapter.

thanks

Blake Calhoun · July 19th, 2007, 06:19 PM

Just be ready to use a lot of light on any interior shooting with the Letus. As I've noted in my test it makes the camera rate at about 50 ASA losing roughly 2 1/2 stops. Good luck!

Yow Siang · July 19th, 2007, 07:05 PM

Thanks. that means it looses more light that it states on the quyen website of 1.5 stops. thanks

ys

Yow Siang · July 19th, 2007, 07:14 PM

just wondering if i shoot in interlace mode then later conver to progressive in post will i be able to shoot with more light? as I see using progressive from the camera lcd it looks much darker then interlaced mode.

thanks
ys

Blake Calhoun · July 19th, 2007, 10:25 PM

If it states 1 1/2 stops of light loss for the Letus then I guess it doesn't take into consideration the SLR lens too? My findings were with both attached to the camera.

As far as interlaced vs. progressive, I don't think that matters. I'm no engineer, but the main thing that has effect on light would be the shutter (and of course the iris). It should be the same I would think in progressive or interlaced.

Note though I did my test shooting 24p at 1/48th shutter.

July 15th, 2007, 09:53 AM	#16
Blake Calhoun Regular Crew Join Date: Apr 2007 Location: Dallas, Texas Posts: 157	Same 1/48th shutter speed was used on both, yes, but we closed the iris as needed to match exposures with the Letus adapter off. For example, with the 28mm lens on and the Letus we shot at F4, but with the Letus off we shot at F7.3. These f-stops were readings from the Canon A1. Hope that answers your question. __________________ Mainly dabble in features and WebTV: www.pinktheseries.com \| www.facebook.com/continuumtv \| www.killingdown.com

July 18th, 2007, 09:50 PM	#19
Blake Calhoun Regular Crew Join Date: Apr 2007 Location: Dallas, Texas Posts: 157	Yes, the 24mm is definitely wider than the fixed Canon lens. Not sure by how much exactly though. I beleive the A1 lens is roughly a 30mm (in 35mm equivalent values). Of course the best thing is you can easily get the shallow DOF look even with the wider angle (with the Letus). __________________ Mainly dabble in features and WebTV: www.pinktheseries.com \| www.facebook.com/continuumtv \| www.killingdown.com

July 19th, 2007, 06:19 PM	#21
Blake Calhoun Regular Crew Join Date: Apr 2007 Location: Dallas, Texas Posts: 157	Just be ready to use a lot of light on any interior shooting with the Letus. As I've noted in my test it makes the camera rate at about 50 ASA losing roughly 2 1/2 stops. Good luck! __________________ Mainly dabble in features and WebTV: www.pinktheseries.com \| www.facebook.com/continuumtv \| www.killingdown.com

July 19th, 2007, 10:25 PM	#24
Blake Calhoun Regular Crew Join Date: Apr 2007 Location: Dallas, Texas Posts: 157	If it states 1 1/2 stops of light loss for the Letus then I guess it doesn't take into consideration the SLR lens too? My findings were with both attached to the camera. As far as interlaced vs. progressive, I don't think that matters. I'm no engineer, but the main thing that has effect on light would be the shutter (and of course the iris). It should be the same I would think in progressive or interlaced. Note though I did my test shooting 24p at 1/48th shutter. __________________ Mainly dabble in features and WebTV: www.pinktheseries.com \| www.facebook.com/continuumtv \| www.killingdown.com

July 18th, 2007, 10:17 AM	#17
Damon Roger New Boot Join Date: Jul 2007 Location: Thousand Oaks, CA Posts: 21	Thank you Blake, Great examples! Its interesting how the colors change and look more organic with the adapter and lenses without any extra tweaks...

July 18th, 2007, 07:23 PM	#18
Yow Siang Regular Crew Join Date: Jan 2003 Location: Singapore Posts: 153	Hi Blake, I like to know once you have the adapter on and fixed on the 24mm lens. does it give you much wider view than the widest side of the stock A1 lens? Thanks yow siang

July 19th, 2007, 01:46 AM	#20
Yow Siang Regular Crew Join Date: Jan 2003 Location: Singapore Posts: 153	thanks blake am so happy to know that. As i am asked to do some interior shoot and glad to know i could use my nikkor 24mm lens and need not buy a seperate screw on wide angle adapter. thanks

July 19th, 2007, 07:05 PM	#22
Yow Siang Regular Crew Join Date: Jan 2003 Location: Singapore Posts: 153	Thanks. that means it looses more light that it states on the quyen website of 1.5 stops. thanks ys

July 19th, 2007, 07:14 PM	#23
Yow Siang Regular Crew Join Date: Jan 2003 Location: Singapore Posts: 153	just wondering if i shoot in interlace mode then later conver to progressive in post will i be able to shoot with more light? as I see using progressive from the camera lcd it looks much darker then interlaced mode. thanks ys