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the Doorkeeper

the Doorkeeper
Copyright ©2006, Jens Birch
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Here is the doorkeeper of the Hornet's house.

The hornets have their nest in a bird's nesting box on our house wall and I have made a rig so that I can take images of them. An interesting observation is that they always have a 'doorkeeper' that is guarding the entrance. This is a portrait of the doorkeeper taken at an instant when it looked like it was wondering why I hadn't left yet...

Cheers, Jens.

Photographer: Jens Birch
Folder: Jens' Macro
Uploaded: 25-Sep-2006 19:53 CEST
Current Rating: 9.50/2
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Camera: Olympus E1
Exposure time: 1/160 sec
Aperture: f/11
Focal length: 180
Lens: 50-200 + EC-14 + 500D Closeup
Focusing method: Spot
ISO: 100
White balance: Daylight
Flash: external
Image format: SHQ
Processing applied:
Various: Technical: I used a macro setup that I have started to like very much: Olympus E-1 with a Zuiko Digital 50-200 zoom and a Zuiko digital 1.4x teleconverter plus a Canon 500D achromatic close-up lens (+2 dpt). It allows me to go from M=0.9x to M=0.16x without moving the camera (sensor-subject distance =62 cm). Here the zoom was set to 283 mm and the nominal aperture was f/16. However, with the 500D close-up lens these values change to 180 mm focal length and f/11.
Image resized to: 675x900

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Amazing macro. Very nice portrait of the Guardian of the Hornet?s house, thanks for share with us your technique. Best regards, Ricardo

Ricardo Rico at 12:14 CEST on 26-Sep-2006 [Reply]


Jens, once again you got my attention with an incredible macro.

Loren Lewis at 16:29 CEST on 26-Sep-2006 [Reply]


Adrie Hubregtsen wrote:
> Great shot Jens, very sharp, BUT how can it be, by the use of aperture 11, there?s NOT much
> DOF in the photo???.

No, that is true and it will always be very shallow at this magnification which is 0.9. However, I think that you are right in your observation that is is a bit shallower DOF than expected. The reason is that that the real focal length is shorter than indicated in the EXIF. The value F/11 is based on calculations using the nominal values as read in EXIF data: Focal length 283 mm and F/16.

However, the true focal length of modern zoom lenses with internal focussing is often considerably shorter than what is written on the lens or in the EXIF when they are focussed close to their closest distance. So, assuming that the real focal length is 200 mm instead of 283 mm would mean that the focal length with the 500D in this case would be 142 mm and the aperture would become f/8. Seems reasonable.

Cheers, Jens.

Jens Birch at 20:32 CEST on 27-Sep-2006 [Reply]