HP-35: Clean images

[sasa]

Gerson,

Thank you very much. I can say the same, very clean specimen, If I do not know it is more than 45 years old, I would say it is brand new...

Yes, in a daylight would be much better image. The light should be from the left or right to avoid shadow under buttons as they are quite high for HP-35 (perhaps 5mm, or even more). That is the reason scanning will not give good result here, as with low profile button calculators shown here as well (thank you, striegel ).

If you may take several shots in a daylight, I do not think better can be done:

1. To avoid jpeg quality image degradation, shot image with the higher quality settings for jpg (less compression), or set png, raw or any other lossless format camera may support. The best result may be done if you have a small tripod for camera, as several shots are needed in fixed camera position.

2. One shot when calculator is off. Needed for proper on/off slider position and display off look.
3. Another shot when calculator is on. Display should show '0'. If some backlight comes from cathode tubes when calculator is turned on for unused cathode tubes.
4. Another shot when calculator is on. Display should show "1.23456789 - 01"

Nothing else is needed, perhaps back side as well with the guide, however that is not essential...

From these images proper bands and digits are cut down and used. Of course, if you do not have a tripod, you may make these shots freely from hand and then I can correct all additionally (proportion and position), as well as a minor wear.

You may upload it on your page, if forum limit for attachments is reached.

Thank you very much!