Red and Blue

by Gordon

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15,150 reputation
1952
bio website j.mp/NZPHOTOS
location Auckland, New Zealand
age
visits member for 3 years, 9 months
seen 15 hours ago

merge keep
Contact - apptechnz at gmail com <- you know the drill.

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.


1d
comment How can I amplify the light from a tiny white LED through a keyhole?
Several questions above have not been answered and answers are needed to help you: How close can the source be to the door? Why? Is the target offset so there is no parallel path to it etc. What you ask for MAY be trivially easy or not, but we cannot tell. You can focus light from an LED to a point at a distance from say mms to m's from the LED end. A suitably small diameter LED and lens could send most of its light through a keyhole in a diverging or converging cone. We need to know why this would not be adequate. A picture showing light PATH, camera location and object location is needed.
1d
comment How can I amplify the light from a tiny white LED through a keyhole?
If you could explain what you are actually doing and perhaps show us a better lit image of the setup it would help. You do not say WHY you want to do what you ask or why an alternative is not acceptable. To say that the double keyhole is an important part of things does not tell us much - just sets a riddle. What you tell us is of course your choice, but you could far better explain what you want. Why 1000 lumen,. How close can the source be to the door? Why?> Is the target offset so there ios no parallel path to it etc. What you ask for MAY be trivially easy or not, but we cannot tell.
2d
comment Image Viewer With with Exif
@Arkanon - I don't rate out of N but none have a perfect score.| Rating scheme(s) that count most are: (1) Photos I've taken that I like a lot. (2) Photos from 1. that other people like. (3) MAYBE some photos from 2. that are not in 1. | When the bride / person turned 21 / similar keeps saying "The photos are fantastic" I feel I may be winning. (Not TOO common. Twice lately. Happenstace) |My perhaps most 'popular' photo, that I like but am surprised at the reaction to, is of Kangaroos. My (arguably) all time favourite photo would be passed by by most and I'm not 100% sure why I rate it so.
May
15
comment Image Viewer With with Exif
... files. Works. Lose about nothing (as far as I know :-) ) so far in 15 years and can find almost any photo or event I can remember a small amount about. (Meaningful naming of folders plus a few seed long named photos helps). Works for me. Better exists.
May
15
comment Image Viewer With with Exif
@SailorCire That was meant to obscure other stuff - not to provide information :-). 33TB + a small SSD. Photos the main size driver. "With great difficulty". Currently rationalising usage with smaller older drives being slowly combined onto larger ones. Mix of 1 1.5 2 3 4 TB. NO formal mirroring. At least two copies of historically stable folders (usually more) on separate drives. One or more mirrors of annual or semi annual folders of by-event and by-date folders. | XXCOPY is your great friend! | Run an occasional index run over all photo folders to create about 500 GB searchable index ...
May
15
comment Image Viewer With with Exif
@RomeoNinov This is certainly not a duplicate of the question referenced. The other asks how to view EXIF information. This asks how to do it persistently while stepping through photos. Some offerings do that very poorly or not at all. There are no doubt a number of good solutions and hearing of a few more would be useful. I went into the detail I did because it's only "trivially obious obvious in retrospect" and the options of customisable format or std screen on second monitor are both useful. I like the custom format as I can maximise readability know exactly where to look when scanning.
May
11
comment How do I get a two person portrait with the background blurred using a DSLR and 50mm f/1.8 lens?
There MUST be many existing answers on SE already and there are countless 1000's on the wbe. You can find calulators and formulae that give you depth of focus in given cases, but.| Set lens to f/1.8 for best result. Aperture priority or Manual mode allow this. (Auto modes will if you play with overall settings). Make distance tobackground : distance to subject ratio as great as you can (or accept what is available). Focus on subject. Go. | For abs best result focus short of subject as much as possible while having subject acceptably sharp. Usually DOF is too shallow to have any choice.
Apr
29
comment Tamron 24-70mm 2.8f What is the best Canon to go with?
The DxO optics site allows you to obtain a list of key parameters and an overall figure of merit of a given lens with a range of bodies. I find/found some of their results somewhat surprising and (for me) somewhat unintuitive. Reading their rationale for their rating system is useful.
Apr
26
comment Is the Tamron 24-70mm a good wedding lens for a Canon 5DS r?
@TheoZ I used the lens as the main one at a wedding last weekend (25 April). Generally superb. Focusing speed was not quite as good in low light reception situations as I'd have liked - or as good as the most enthusiastic users had made me expect - and a 24-70 f/1.4 would occasionally be useful (dream on) BUT overall very very nice indeed. Focusing almost invariably good in actual service where light levels are higher that on dance floor or table situations. (Church was wholly artificially lit). (Having a Nikon D700 with a f/1.8 on my left hip meant a fallback was available - always helpful).
Apr
23
comment Is the Tamron 24-70mm a good wedding lens for a Canon 5DS r?
Interestingly, the Tamron cost less here than in the US or even from ebay Hong Kong sellers. | Whether the Canon is worth the extra $450 would depend heavily on how much value people placed on the VC feature, which is of extreme importance to some people (including the OP, although for reasons which are deemed irrelevant in this forum :-) ). I'll add review links and a VC comment at the end of my answer.
Apr
22
comment Is the Tamron 24-70mm a good wedding lens for a Canon 5DS r?
Your graph shows that paying the additional 75% for the Canon ... II does give you something for your $. And no doubt some will pay that for the difference, and the Canon badge. The Tamron 70-200 looks tempting. And I can see my D700 asking for a companion Tamron 24-70 WITH VC (unlike the Sony one) at some stage.
Apr
22
comment Is the Tamron 24-70mm a good wedding lens for a Canon 5DS r?
... with a single press with great confidence except in very low light and with very fast subject motion (eg traffic) . Even those could be helped along I imagine. I doubt that I'm going to be converted to AF priority single press shooting any time soon, but my A77 can be run in AF preference mode and taken back to MF with user release control instantly using the AF/MF button just under the edge of the right thumb when in normal shooting stance. SO some brain reprogramming is liable to be in order with a likely best of both worlds result.
Apr
22
comment Is the Tamron 24-70mm a good wedding lens for a Canon 5DS r?
+1 Good info. The Tamron AF is, as others said in the reviews that helped persuade me (and elsewhere), awesome. I essentially always focus with half pressure and then take the shot, even in the most extremely urgent of situations. I set the camera to release preference so that if I want to take a shot before the camera says its ready I can take it. Today I set the camera to Af precedence and practiced going from out of focus to shot with a single press. The results were super. You have to make sure you are focusing on what's intended (of course) but once you are you can "point and shoot" ...
Apr
21
comment How can I achieve this 'pure white' skin effect?
Image above does not give a good feel for original. Many versions on web. Most small and unattributed. Larger version here - this may have originally been from "Vogue" magazine - if so just about anything may have been done to achieve the effect.
Apr
21
comment How to reduce noise shown in LiveView when photographing in the dark?
You need to specify camera m=brand & model for best advice on such things. Results and options can vary widely.
Apr
21
comment Fun experiments I can do with my bridge camera?
Ideas etc roll with scroll wheel
Apr
21
comment Fun experiments I can do with my bridge camera?
From above Photo on left taken through mesh on right , get close, New: 24mm marginal try this , unusual contexts , just a fountain , Long lens lets you get these
Apr
21
comment Fun experiments I can do with my bridge camera?
Lens is f3.4-5.8, 24-720mm | Lots of ideas here in this SE question - related to a 18-55mm lens on a Canon 1000D. You have much more zoom, slower shutter response, worse noise performance, ... . AND much of the ideas in the answers there still relate. Note that there are a number of sample links from my answer. Note that the 'through the bars' type photos work bet at large aperture and distance to bars etc << focal length - so you have many opportunities with large zoom.
Apr
21
comment What causes the focus confirmation lights to blur?
Comment only: With no lens attached, I'd not be surprised if anything that could happen did happen wrt focus points, as focus is "impossible" [tm]. Also - 'I'd have thought' focus lights are very unlikely to be able to "blur" as they are (presumably) on or off or at best modulated in a point location. Occam suggests that To achieve what you are seeing means something has happened to the viewing system. Occam is not always right :-).
Apr
21
comment Is the Tamron 24-70mm a good wedding lens for a Canon 5DS r?
@MichaelClark THere is a Canon version link in bold text just above the table. 16/31 of the lenses in that table are Canon branded. ... Update: Added Canon table so no need to click on link. Left Nikon table as gives an even wider comparison cross-section.