Alley in Pisa, Italy

by Lars Kotthoff

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13,920 reputation
1644
bio website j.mp/NZPHOTOS
location Auckland, New Zealand
age
visits member for 2 years, 11 months
seen Jul 22 at 11:28

Electronic designer. Professional Engineer. Oldish aka "reasonably experienced" :-).
Contact - apptechnz gmail com <- you know the drill.
Tel: +64 9 837 2999 gmt+13

Special interest in technological solutions for developing country applications. Extensive in-China experience in product development & manufacturing in China.

Jack of all trades, Master of Electrical engineering. (aka ME (elec)) Interested in all aspects of modern technology. Professional qualifications in electrical engineering but practically proficient or conversant in many peripheral areas.

Recent extensive experience in solar powered LED lighting development and manufacturing in China for markets worldwide.

"Servant of the Most High God" / committed Christian. Happy to work enthusiastically and interact amicably with people of all nationalities and creeds.

Married with 2 adult children.

Obsessional photographer.


Jan
26
comment How useful is silica gel for protecting SLR cameras against condensation from changes in temperature?
That would have to be 'maybe'. I'm aware of the general principles of condensation and dewpoint and relative humdity etc and have pored over[psychrometric charts](. google.co.nz/…) for various reasons. I'm even aware that the normal arguments for camera lens fogging when exposed to cold air are the inverse of actual(!) But in this case it MAY have just be a was mounted fan heater. May. Technically that counts as a dehumidifier in that context.
Jan
26
comment How useful is silica gel for protecting SLR cameras against condensation from changes in temperature?
FWIW blown warm air clears up condensation rapidly. In Kuala Lumpur a butterfly house had a warm air blower inside the entrance to allow people to defog spectacles and camera lenses. I do not know if the air source had been dehumidified.
Jan
26
comment Unable to get sharp landscape picture
1/60s at 50mm and 1/15s at 18mm are more or less on the limit for acceptable results with a very carefully held camera and Ninja breathing. Use a rock or tree or pack or whatever for bracing. f/22 is liable to have at least some diffraction effects and a kit lens can't help.
Jan
26
comment Protecting from sun when taking pictures
I would happily take a photo like that and have taken many similar. BUT carefully read the other answers and general TECHNICAL comments and understand what you are trying to avoid. Note the melted spot in another answer's sample photo. Keep the sun small. Be quick. Be prepared to accept damage worst case. Realise that you have a maximum of 2 eyes.
Jan
25
answered What are the editing restrictions for sports/photo journalism?
Jan
24
awarded  Nice Answer
Jan
21
comment Is this rather high resolution possible to achieve?
It is very unlikely that you need 300 dpi resolution. A Nikon D800 with 36 Mp sensor has a resolution of 7360 x 4912. That would give 187 dpi at 1 metre without interpolation. A 24 Mp Sony A77 with 24 Mp and 6000 x 4000 resolution = 152 dpi or half what you ask for. On something like wood grain with (relatively) "smooth' major trends in the patterns, plus lots of fine detail, it would be worth trying interpolating a smaller resolution image to see what the result looked like. | Interest only: An interesting example playfulstitching.files.wordpress.com/2012/02/dscn3056.jpg
Jan
17
comment Controlled X Y Gantry - Systematic Photos to be stitched / tiled
@mattdm - [iRFANVIEW ADDON TO AN ANSWER JUST FOR YOU :-} [photo.stackexchange.com/questions/46980/… - and, yes, it would be a poor tool to use in that case, alas.
Jan
17
revised How can I get rid of a black dot in a picture?
added 551 characters in body
Jan
17
answered How can I get rid of a black dot in a picture?
Jan
17
comment Controlled X Y Gantry - Systematic Photos to be stitched / tiled
@mattdm - I get the same % on Irfanview sales as I presume is gained by those who always provide Photoshop or 'The GIMP" based answers. I get the same % when I shill for jhead. | James downvote is because (he says) " ...a gantry system that can overlap each image within mm precision. ..." is not really true and absolute tiling apparently is/isn't wanted. I could add a script files that converts my fully described in-words process to a "click here" solution, but presumably that would just get 8 downvotes :-). | I evidently misunderstand "answer is [useful |not useful]" distinction. Whatever.
Jan
16
comment Controlled X Y Gantry - Systematic Photos to be stitched / tiled
@Colin Evidently the downvoter thinks what I suggested does not do what you want - or just can't read or doesn't care. Irfanview/panorama can accept an overlap - effectively a negative gap between images. If your images are rectangular and arranged on a rectangular grid then it (still) seems that Irfanview may do exactly what you want. An issue is how to deal with the overlap. Irfanview overlays the right hand images over the left hand ones when tiling left to right. And overlays the lower images over the edges of the top ones when tiling top to bottom.
Jan
16
answered Controlled X Y Gantry - Systematic Photos to be stitched / tiled
Jan
14
answered Best practices for documenting your photography gear
Jan
14
revised Which Polaroid Camera has been used here?
is->has spotting-> identifying
Jan
13
revised Will a higher-amperage USB charger let me fast charge a Nikon battery?
added 2342 characters in body
Jan
13
comment Will a higher-amperage USB charger let me fast charge a Nikon battery?
Answer edited - no information changed bu clarified and some extra information added. Buy an external clone MH-65 charger.
Jan
13
revised Will a higher-amperage USB charger let me fast charge a Nikon battery?
added 1354 characters in body
Jan
13
revised Will a higher-amperage USB charger let me fast charge a Nikon battery?
added 2744 characters in body
Jan
13
answered Will a higher-amperage USB charger let me fast charge a Nikon battery?