Infrared Photography

[tomcat]

Hi IR guys,
Excuse the quality (camera sat on car roof at work)
Trying the EF 50mm 1.8 lens (MUCH lower exp time <2sec :thumbsup: )

I might guess that with the other lens I used the hot spot is more prone
due to exp times of >8 sec :dunno:

The sunlight there must have been very bright or you are using very high ISO or both for such a short exposure time with the 20D.
I didn't experience any hot spot problem with this lens even at my usual 20-25s exposures at ISO 400 so I don't think fast exposure is the reason why there's no hot spot with this lens.

 

[Pablo]

The sunlight there must have been very bright or you are using very high ISO or both for such a short exposure time with the 20D.
I didn't experience any hot spot problem with this lens even at my usual 20-25s exposures at ISO 400 so I don't think fast exposure is the reason why there's no hot spot with this lens.

Hi tomcat,

The time was 9:20 this morning (quite clowdy put good patches of sun)
ISO 400

The previous post shots were with the EF 28-135 3.5-5.6 USM IS
That gave me the hot spot at ISO 400 >8sec
:dunno:

 

[teerex]

guess what guys..

im in action!!! :devil:

CP found a Cokin infrared 007 at their warehouse...i collected it today

One down, one to go. ark19 we're waiting for you.

Ya let me know if you can find the acrylic.

I took a look at my Hoyarex acrylic filters, they all 2mm thick to fit the Hoyarex Filter Holder. Maybe the Cokin also uses this thickness filters for their holder but the size may be different. Hoyarex filters are 75mm x 75mm, like the Ilford SFX200.

 

[teerex]

A few shots to share from this morning's shoot at Marina Park. Comments ???

Shot with Nikkor AF35-70, f3.3
ISO200, f/3.3, 1/13sec, +0.3ev,multi pattern. Shot at 3000x2000 and cropped.

Does processed noise work for this picture?

 

[teerex]

Hi IR guys,
Excuse the quality (camera sat on car roof at work)
Trying the EF 50mm 1.8 lens (MUCH lower exp time <2sec :thumbsup: )

I might guess that with the other lens I used the hot spot is more prone
due to exp times of >8 sec :dunno:

Hi Pablo and tomcat,
Putting hot spot aside, is it characteristics of the 20D to have such long exposure time? Pardon my ignorance with the Canon, but Pablo is using a f1.8, 50mm lens. Then at full aperture, shouldn't the exposure time should be relatively shorter. :dunno:

 

[Pablo]

Hi teerex,

Like them all :thumbsup: :thumbsup:

The first one... great colours.... great shot.
The second one .... great colours ... straight up the palm :thumbsup:
The third one ... interesting, how does it look without noise :think:

P.S. I very much would like the time for exposure to be SHORTER, but :dunno:
I envy you the D70.

I will play with the 50mm 1.8 more when I get time. This morning I only had
2min time before going inside, didn't set up or anything, just stick on lens and filter
then shoot.

I think there is some relation to length of exposure time and hot spot.
Even my Fuji S607 will develop a mild hot spot if f stop is high and exp time long .

 

[Pablo]

Hi teerex,

Haaaaar, I see you have used a tripod for these shots

You don't like to carry a tripod :bsmilie:

Good shots, sharp !


Just think :think: maybe you can hold the camera still in hand 1.3 sec

Oooooooh the POWER of a Nikon owner :bsmilie:

 

[ark19]

A few shots to share from this morning's shoot at Marina Park. Comments ???

Shot with Nikkor AF35-70, f3.3
ISO200, f/3.3, 1.13sec, +0.3ev,multi pattern. Shot at 3000x2000 and cropped.

Does processed noise work for this picture?

Wow, I like all 3
:thumbsup: :thumbsup: :thumbsup:
Err... but the third one is a tad slanted.... :think:

Bought the Dremel and had cut the filter cover to size (maybe over excited, over-cut, but filled edges with yellow-tack to coverup).

Will post results in awhile.

Paiseh, hope to find the acrylic by next week, but if still can't will make do with the improvised one. So maybe can set a outing for next weekend?

 

[teerex]

Hi teerex,

Haaaaar, I see you have used a tripod for these shots

You don't like to carry a tripod :bsmilie:

Good shots, sharp !


Just think :think: maybe you can hold the camera still in hand 1.3 sec

Oooooooh the POWER of a Nikon owner :bsmilie:

Hi Pablo,
What makes you think that I used a tripod for the shots?

Believe me, they're handheld. No I did not use a tripod at all, not even a monopod. But I do carry a monopod occasionally for personal protection when I go to lonely places alone to shoot. You never know who or what is lurking behind bushes.

This is the shot without the noise

 

[teerex]

Hi teerex,

Haaaaar, I see you have used a tripod for these shots

You don't like to carry a tripod :bsmilie:

Good shots, sharp !


Just think :think: maybe you can hold the camera still in hand 1.3 sec

Oooooooh the POWER of a Nikon owner :bsmilie:

Pablo, sorry typo error. Shutter speed should be 1/13sec and not 1.13sec. :embrass:

I edited the original post.

 

[teerex]

Err... but the third one is a tad slanted.... :think:

Ya hor. I see and see look like ok that's why I posted. :bsmilie:

So maybe can set a outing for next weekend?

Fine with me, if it's ok with the rest of the guys.
Would someone like to suggest a location?

 

[Pablo]

Hi Pablo,
What makes you think that I used a tripod for the shots?

Believe me, they're handheld. No I did not use a tripod at all, not even a monopod. But I do carry a monopod occasionally for personal protection when I go to lonely places alone to shoot. You never know who or what is lurking behind bushes.

Hi teerex,
Ok no tripod

I think I prefer the no noise pic.

Just my taste. I don't often like the effect of noise in a photo.

But thats me.
Cheers.

 

[tomcat]

It is the characteristic of the 10D & 20D to require long exposure time for IR photography because of the strong IR absorption effect of the anti-aliasing filter used in these cameras. These 2 DSLRs are therefore not very sensitive to IR unlike the D70. Seems that the D30 is much more sensitive to IR than the D60, 10D & 20D and makes a good IR camera. Almost wanted to buy a second hand D30 just because of this capability.

Like lens flares in normal photography, hot spots are mainly caused by the design of the optics and the coating used in a particular lens and the severity varies from lens to lens from almost non-existent to very bad. If present, it is also aggravated by exposure time and the position of the sun with respect to the camera (as like in flares). It is always recommended that the sun should be at the back of the photographer to minimise the appearance of the hot spot.

From my experience with the 50mm f/1.8, the hot spot problem is practically non-existent and therefore is not aggravated by long exposure times as could be seen from my shots taken with the 20D and 50mm lens at Marina City Park and posted here earlier. If Pablo plays around more with his 50mm lens eventually, he would also come to the same conclusion I am sure.

If the 50mm lens is used at large apertures, the Laws of Optics would certainly dictate that the exposure time required would be shorter than at smaller apertures. However, most info posted on the internet on IR photography advise that smaller apertures be used to get better results. This is because the focal point for IR is slightly different from that of visible light and the resultant IR image might look out of focus due to the much smaller DOF of large apertures. Hence to minimise this problem, it would be better to use smaller apertures which might result in a DOF that is large enough to include the focal point of IR light thereby ensuring a sharper final image. Perhaps the blurry photo posted by Pablo was because it was taken at the EF 50mm's max. aperture of f1.8 ? :dunno:

 

[Pablo]

Hi tomcat,

Many thanks for your understanding in this matter and sharing it so well.

I have taken much from what you have written.

I will be experimenting with this lens much when time permits.

You were correct "EF 50mm's max. aperture of f1.8".
I didn't try anything else as time was short, but,
I do notice that the colour possabilities are there :thumbsup:

Can't wait for next play time ;p

Cheers.

 

[acrylonithrill]

Oooo... that leaves me with an improvised IR :cry:



Buffing machine? To polish the edges of the plastic?
Actually a good sanding of the edges with wet abrasive paper should do the trick

A dremel with polishing bit can also be used http://au.dremel.com/html/home_fr.html

Did you notice the injection moulding mark on the bottom centre base of the hoya container? I want to remove that by buffing... "Hopefully"

 

[teerex]

Thanks tomcat for taking the time for the very detailed write up.

Appreciate it :thumbsup:

 

[ark19]

Did you notice the injection moulding mark on the bottom centre base of the hoya container? I want to remove that by buffing... "Hopefully"

Ahh, I see what u mean...

I think the plastic will break if you use a buffing machine, the speed cannot be controlled (at least in my Sec school days..) After using dremel on it already found a crack on it

I'd trimmed the edges and framed it in the 67mm filter ring.
Took some snaps but as the Sun was abt to say "night night" it was not good, so will not post. Notice that the center of the pic will have a blur spot and maybe because of this had a hard time to focus... wonder if it is caused by the molding mark?

Hopefully can find the acrylic...

OT for awhile, if you guys wanna buy a dremel, NextByte at 2nd floor of Lucky Plaza selling see this thread in Hardwarezone: http://forums.hardwarezone.com/showthread.php?t=874657&page=1&pp=15&highlight=dremel

 

[acrylonithrill]

that's where i got the buffing idea also... from the sec sch technical lessons. Now i thinking of getting a cokin A frame, get the acrylic... How much is a Cokin A frame, with its adapter ring?
Then the moulding mark will cause either a black spot or you can "smudge" it by moving around. For me focusing is not a prob. Put to MF, set to infinity.

 

[PandaOng]

A few shots to share from this morning's shoot at Marina Park. Comments ???

Shot with Nikkor AF35-70, f3.3
ISO200, f/3.3, 1/13sec, +0.3ev,multi pattern. Shot at 3000x2000 and cropped.

Does processed noise work for this picture?

Hey Teerex, you got yourself a very very nice series. I like the composition a lots. especially the tree shot. very very nice and pleasing to look at.

Hey hey....if you guys coming out this weekend? I cannot make it on 25th. 26th maybe can. shoot shoot.

 

[PandaOng]

You guys check out the bookstore that is just opened at adelphi? it is at level 4. They have got a number of books on Infrared photography....i say a couple that is on digital infrared too. Do check it out. not a bad place to hang out in too. they have got a 'cosy' corner where you can browse the book...but of course when finish browsing, kindly buy 1 or 2 books lah...ya??