lwingkay

Dear Neil,

Thanks for the trial run information which sounded not only interesting but also thrilling to those who have special liking for digiscopy.
Would be obliged if you would enlighten me on two issues about G1's use on Swarovski's:
a) Is the attachment of Swarovski's adaptal ring on the 14-45mm kit lens dependent on the filter screw furrows at the front of the kit lens? Most likely, that is the case, I presume. Then, is such a mounting strong and firm enough to withstand the frequent tilting, pivoting and rotating that comes along with the usual manuver involved in digoscoping?
b) Contrary to yours, my fieldscope is an angled one. Is it likely that the weight of the camera will press on the lens, automatically changing the zoom disposition while the set-up is in its free-standing position?

Seeing your set-up, I grew the idea that the best location for making connection of Swarovski's adaptal ring with any short-ranged DSLR zoom lens is the narrow and stripped region between the focusing ring and the zoom ring. To do so, one way is to permanently fix a circumventing ring with screw furrows to this narrow region, from which to bite the screw lines of the ring with the screw lines on Swarovski's adaptal ring. In one sense, the alignment is much tougher. In another, there will be no zoom-change problems arising from the force of gravity on the camera ... and more importantly, I have the feeling that there will be much lesser vibration as a result the concealment of part of the length of the DSLR lens in Swarovski's adaptal ring, thereby significantly reducing the lever arm between the DSLR and the point of anchorage on the adaptal ring.

The problem, however, is with the making of such a ring on the lens, which is much of a headache to many a layman who has near-to-none knowledge with fitter techniques.

Peter

lwingkay

Thanks, Wing. I am fully aware of your concern over the vibration issue. I still remember what you suggested in a correspondence with you. You said Forget about it. Perhaps, vibration is a physical limitation that few can go an inch beyond it ... but the Chinese say it well that once when one decides to set foot on the Great Wall, one's heart will grow fondered unless the desire is filled.  Pete

lwingkay

Thanks Neil for the photos and the information. I think the photos in the thread More photos from the G1 are fresh from the camera without denoising, aren't they? That being the case, the G1 is really worth giving due consideration next time when procuring another digital camera for digiscoping purposes.
Do you mind posting the raw jpeg file for the one at ISO1600 for comparison?
Pete

lwingkay

Thanks, Neil. It is very kind of you.  Pete

lwingkay

Dear fneil,
The photos showing the assembly process are fantastic.
A matter of interest about vibration arising from the mass extended from the 52mm plate of the DCA adapter. The ups and downs of the reflex mirror of the DSLR are vibrations enough to bring about image blurring. Are there any good methods to harness vibration from that? I know that Swarovski has a telescope base with a rail under it for mounting the fieldscope, the link to it being http://www.swarovskioptik.com/in ... .94720262&css=. At least, there are three anchorage points on the base for steadying the fieldscop,as can be seen from the photo, which definitely will do good to vibration prevention. Any experience you have with that in addition to your other experiences related to vibration control?
Regards,
Pete

lwingkay

An AF 24-50mm zoom Nikkor is used. The silver-colored tube structure is an adaptal ring to link the eye-piece with the zoom lens to which a DSLR can be attached.

Manuvering as follows:
a. The eyepiece is locked in position by fastening the first two screws from the left.
b. Rotation along the central axis can be done by releasing the second pair of screws from the left.
c. Windows are opened on the barrel of the adaptal ring to cope with focusing.
d. The adaptal ring is clamped in position by 3 screws with their tips nailing on the thin strip of landing between the focusing ring and the zooming ring. Properly set up, full-range zooming and focusing is possible.
e. Only slight vignetting occurs when the lens is zoomed in to 24mm.

Additional information about tube length adjustment
You see two rings behind the rows of screws and screw lines on the barrel between the two rings. They are for the purpose of adjusting the legnth of the adapter for coping with the difference in height of the eyepiece. The 30x is 62mm while the 45x a slight bit longer, around 63-64mm; the measurements were taken when these eyepieces were mounted onto the fieldscope.

Here are a few pictures of the set-up.

1  The adaptal ring to which the zoom lens and the eyepiece have been attached

[ Last edited by lwingkay at 24/02/2009 01:47 ]

lwingkay

2   The fieldscope with a 45x eyepiece on

lwingkay

3  The fieldscope mounted with the eyepiece, adaptal ring, zoom lens and DSLR

[ Last edited by lwingkay at 24/02/2009 01:39 ]

lwingkay

Two pictures. The shooting particulars for the following one are:
ISO 100, Aperture at 5, Shutter Speed at 1/3 of a second. Camera being a Nikon D200. Mirror was held up and the delay exposure mode was used. The shutter was released using a cable release.

Postscript:  The eyepiece for this one was a 30x.

[ Last edited by lwingkay at 24/02/2009 01:52 ]

lwingkay

5
ISO 640.  Shutter Speed 1/3 of a second. Aperture at f4.5. Other shooting particulars as the ones in #4 above.

Postscript:  The eyepiece for this one was a 45x. The kingfisher was very far away, about 20-25m in distance.

[ Last edited by lwingkay at 24/02/2009 01:51 ]

lwingkay

Vibration is difficult to overcome. I am thinking of providing an additional anchorage point to the dorsal side of the fieldscope to reduce vibration but since I am using a Manfrotto 501 tripod head, installing an additional anchorage is difficult limited by the length of the 501-fast-release plate. Probably, Swarovski's telescope base is a solution.
Thanks for viewing.
Pete

lwingkay

Comparison with images taken with a CP8400.

#6 and 7 were at ISO 50. Shutter speeds were very low but in the absence of a reflex mirror, vibration is not a problem with CP8400.

6

lwingkay

The kingfisher in #6 was about 20-25m away. The eyepiece used was a 45x.

#7
The eyepiece was a 30x and the bird was about 7m away.

lwingkay

A really interesting set-up. Thanks, Neil.  Pete

lwingkay

Quote:

Original posted by hsteen at 3/03/2009 15:50
I use a remote control on the camera Nikon D200 and make the setting on Mirror up.
The you have to press the remote twice to take a photo.
No shaking.
To Neill:

Nice shots as usual and thanks for the ...

An additional improvement on shake prevention: Using the exposure delay mode as well.
Pete

lwingkay

Two shots taken with the 80HD ATS, a 30x-eyepiece, an AFD 24-50mm Nikkor and a D200.
The zoom at 40mm (APS equivalent approx 60mm)
The aperture at f4.
The shutter speed:  5 sec for Shot 1 and 6 sec for Shot 2
Released with the mirror locked and the shutter at delay exposure mode.

1

P3100302.JPG (155.2 KB)

10/03/2009 01:53

2

P3100301.JPG (101.41 KB)

10/03/2009 01:53

[ Last edited by lwingkay at 10/03/2009 01:54 ]

lwingkay

Plate 1 below was taken in The Chinese University of Hong Kong on Mar 14 at 16:58 hrs. The sky was pretty gloomy that day.
Shooting particulars as follows:
Camera: D200
Lens: AFD 24-50mm Nikkor, Swarovski 30x-eyepiece, Swarovski 80HD ATS
Settings: Zoom at 50mm, Aperture f5, Shutter Speed: 1/40 of a second, ISO AT 250
Release: Directly by pressing on the shutter release.
Distance: The kingfisher was about 20m away.

Vibration is still a problem but much improved after resting the fieldscope on a support as shown in Plate 2, the making of which is still underway.

Plate 3 is the adaptal ring holding the zoom lens and the magnifier.


Plate 1


Plate 2



Plate 3



[ Last edited by lwingkay at 22/03/2009 18:39 ]