Why does the picture constantly go out of focus while filming on zoom

Hi.
Probably the problem come from a loose screw inside zoom cylinder. Normally it happens due to constant use or vibration.
The GMR sensor is very sensitive to magnetized tools an needs an accurate position to function properly.
If you don´t have experiencie with this electronic systems, it is better you to contact Sigma Service in Ronkonkoma, N.Y.

What happens when you turn the focus ring? And just out of curiosity, how are you getting to a 30mm setting on a 35-105mm lens?

Yes. It's a push pull zoom action.

One touch zooms as used on 35mm film SLRs used to have the same mechanism, the zoom ring twisted as well to achieve focus but now that most lenses are autofocus that's unnecessary. So you have a lens which just retains the push-pull, a far more natural action in my opinion and usually faster than a rotating zoom. Once you get used to it I think that you'll prefer it.

By contrast, most modern zooms have what was considered in 35mm terms to be an old-fashioned twin touch zoom: one ring was turned to zoom the lens and another was turned to focus it. This sometimes meant that after zooming you had to refocus; your push pull zoom will likely have a more technically demanding constant focus zoom action, there will be an additional manual focus control as well, but it's very much a minor secondary control used only when your AF has broken or is switched off.

I hope that my reply has been of use to you, please return the favour by rating my answer.

Description: Sleek and stylish, the exciting new Nikon One-Touch Zoom 90QD offers real zoom power in a lightweight, easy-to-use design. The One-Touch Zoom 90QD has a sharp, clear, 2.5x zoom lens with a 38-90mm range and a macro mode for shots as close as 11 inches. The One-Touch Zoom 90QD features a built-in automatic flash with five versatile modes (auto flash, anytime flash, flash cancel, slow sync and red-eye reduction). The active infrared autofocus, infinity focus (for landscapes and faraway subjects), real-image zoom viewfinder and fully automatic exposure control all help to ensure clear and balanced photos.

Depth 2.1 in. Film Type 35mm Width 4.6 in. Height 2.5 in. UPC 018208018789 Battery Type 1 x 3V Lithium Battery (CR-2) Weight 7.84 oz. Self Timer Yes Camera Type Point and Shoot Focus Type Autofocus Minimum Focus Distance 1 ft. ISO Range - Automatic Setting ISO 100 - 800 Red Eye Reduction With Red Eye Reduction Zoom Size 2.4 Auto Exposure Yes Min Aperture f10.5 Waterproof No Max Aperture f4.8 Zoom Lens With Zoom Lens Zoom Range 38 mm - 90 mm

User Manual can not be found up to now. Very soon will be available.

If you aren't planning on zooming in or out, you can lock the AutoFocus by:
- first assign the shortcut key to the AFL (Auto Focus Lock) setting (by going to Menu, then "Set Shortcut button") - then while filming, press the shortcut key (which you have assigned to the AFL setting) and the focus will adjust and unlock (the AF will unlock when you press any other button). - each press of the shortcut key will adjust and lock the focus

Yes, common problem, small plastic tab(s) connecting viewfinder to the zoom are broken.

The flashing H means hat the camera has detected a hardware fault on starting up. It can also mean that the film has mis-loaded. Try removing the film & then the battery to reset it. Put the battery back & switch on. If it's still doing it then I'm afraid it's got the 'flashing "H" of Doom'. Although this is repairable, it's usually not economically viable.

Yes, this is a strange issue. Have you dropped the unit, or maybe 'bumped' it or anything similar. I know alot of times, people like to 'hit' their unit, to get it to do things (like eject tape). What people don't realize, is that these machines are prone to damage when hit hard enough (just like anything else).

In any event, this is not an misconfiguration issue, and you won't be able to fix it. You would need to bring it in to a qualified service center for an estimate. Be sure to shop around to find the best price and service. Since parts for these are not cheap, and they are labor intensive.

Good luck.

Hope this helps some.

TWEAK A/V LAB

Possibility is two. 1. If the lens contact to the body is not good so make sure the contacts are clean and position is locked completely. 2. 90% of the solution comes from repair on Main circuit in the lens. Good Luck. For further assistance go to www.camerarepairjapan.com James.

make sure there is no fingerprints on the lens glass