Olympus UK E-System User Group
Olympus UK E-System User Group

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Search: Posts Made By: Petrochemist
Forum: Flash 20 Hours Ago
Replies: 3
Views: 118
Posted By Petrochemist
Re: Flash Diffuser

I have a huge range of those things around at work, from A4 & bigger down to around 1" across.
I'll have to experiment & find which sizes best fit my different flashes. :)
Forum: Macro 5 Days Ago
Replies: 4
Views: 259
Posted By Petrochemist
Re: RMS Thread Adapters

You can't reduce the length of the cone (infinite objectives are easiest if close coupled to the lens) ;)

If you've already got an adapter to filter threads you've avoided the issue.


I can...
Forum: Macro 5 Days Ago
Replies: 4
Views: 259
Posted By Petrochemist
Re: RMS Thread Adapters

RMS is 0.8" 36 tpi, so no M25 isn't RMS, JIS might be the same even though I've seen it listed as 20.8mm.
There are Nikon CF160 Infinite series objectives in 25mmx0.75 but they're the only...
Forum: General photography discussion 1 Week Ago
Replies: 26
Views: 954
Posted By Petrochemist
Re: ISO is Fake - Seriously

The DIN part of the scale which is the bit after the slash & frequently left off is actually the logarithmic part, while the ASA portion is Linear. The speed you referred to is officially ISO 100/21...
Forum: For sale or wanted small ads 1 Week Ago
Replies: 15
Views: 813
Posted By Petrochemist
Re: Plastic Fantastic

No, not really a fan of Coke. :)


I wasn't particularly my list, just the first one I came across, it left out quite a few, presumably having been compiled by a Canon user.
FWIW My Nifty...
Forum: General photography discussion 1 Week Ago
Replies: 26
Views: 954
Posted By Petrochemist
Re: ISO is Fake - Seriously

I know of two for film:
ISO 5800 for colour negative
ISO2240 for Black & white


For digital we have ISO 12232 which apparently has 5 different techniques that can give different results. There...
Forum: General photography discussion 1 Week Ago
Replies: 26
Views: 954
Posted By Petrochemist
Re: ISO is Fake - Seriously

The ISO values many of today's cameras reach are above any defined in any ISO standards. I suspect the problem is the length of time it takes to approve ISO methods, which is generally many years.
Forum: For sale or wanted small ads 1 Week Ago
Replies: 15
Views: 813
Posted By Petrochemist
Re: Plastic Fantastic

No, as I stated its the 150-500 OS, There are many sigma lenses with nicknames most of them are more than I can afford, sometimes vastly so like the Sigmonster IIRC.


Heres a list I've just...
Forum: For sale or wanted small ads 1 Week Ago
Replies: 15
Views: 813
Posted By Petrochemist
Re: Plastic Fantastic

Yes that lens has the same nickname, and is I think somewhat better known by it.


Nicknames have a habit of being picked up & used for other things, but still they can be fun.


Among my...
Forum: General photography discussion 1 Week Ago
Replies: 24
Views: 811
Posted By Petrochemist
Re: Flickr and exif

Unfortunately it doesn't help much at work (where IT installed IE11 & we can't just install something else). But perhaps I have some better reasons for asking to have a real browser installed!
Forum: Foto Fair 1 Week Ago
Replies: 9
Views: 329
Posted By Petrochemist
Re: Out of Focus..

I'd say the blur is almost entirely die to subject movement, rather than focus. It works very well, quite different from many panned track shots where there's less vertical movement.
Well done.
Forum: Telephoto 1 Week Ago
Replies: 18
Views: 830
Posted By Petrochemist
Re: Tits Nest

I don't think those are the same images you posted initially. The second of the originals you could clearly read the writing inside the enclosure at the top, it's blurred on both of these.
Forum: Foto Fair 3 Weeks Ago
Replies: 15
Views: 806
Posted By Petrochemist
Re: Who Pulled the Plug?

I don't think I've ever seen any lock gates that are painted. The arms on the other hand (which stay out of the water_ normally are - usually white, this may be more to reduce the incidence of people...
Forum: General photography discussion 3 Weeks Ago
Replies: 24
Views: 970
Posted By Petrochemist
Re: Is the Nokia 9 a game changer

I does produce nice images but it's not for me. I enjoy changing lenses & fiddling with optics far more than post processing. So even if the quality surpasses my cameras (all 5+ years old now) I...
Forum: Foto Fair 3 Weeks Ago
Replies: 14
Views: 468
Posted By Petrochemist
Re: Didn't see that when I took the shot!

Looks just like one to me, It's just far enough away to be blurred more than usual, after all the focus is on the fly!
Forum: Foto Fair 4 Weeks Ago
Replies: 15
Views: 806
Posted By Petrochemist
Re: Who Pulled the Plug?

In the UK generally only at the locks. Remember nearly all of them were dug by hand!
Dutch ones tend to take much bigger traffic so are usually in a completely different league, but the width here...
Forum: Foto Fair 4 Weeks Ago
Replies: 18
Views: 530
Posted By Petrochemist
Re: "That back-to-front lens hood" - Post yours here.

I change lenses a fair bit so will also tend not to bother using a hood if the local lighting doesn't make it necessary.


Most of the lenses in the bag with my NEX6, which gets used most at the...
Forum: Nostalgia Nexus - early and pre-digital discussion 4th February 2019
Replies: 18
Views: 1,148
Posted By Petrochemist
Re: Thornton Pickard 5x4" half-plate view camera?

I believe symmetrical lens designs could be quite high quality, many of them are still quite usable today (at least by those of use who don't obsess about sharpness)


Ansel Adams certainly got...
Forum: Nostalgia Nexus - early and pre-digital discussion 4th February 2019
Replies: 18
Views: 1,148
Posted By Petrochemist
Re: Thornton Pickard 5x4" half-plate view camera?

These massive cameras weren't the norm in the 1930s, they were more routine prior to the release of 120 (& similar) films (around 1900), but still offered considerable advantages for those wanting...
Forum: Flash 4th February 2019
Replies: 6
Views: 432
Posted By Petrochemist
Re: Flash Which Tilts Forwards

I often find one flash gives too much light unless held quite a way back (even in TTL). So a simple reflector to fill shadows is adequate instead of second/third flash.


Perhaps not suitable for...
Forum: Flash 4th February 2019
Replies: 6
Views: 432
Posted By Petrochemist
Re: Flash Which Tilts Forwards

I simply use my flash off camera, linked by a TTL cord. This gives complete freedom to point it any way I want :)
Forum: Nostalgia Nexus - early and pre-digital discussion 3rd February 2019
Replies: 18
Views: 1,148
Posted By Petrochemist
Re: Thornton Pickard 5x4" half-plate view camera?

Modern large format lenses are all sized for Copal shutters, which probably wouldn't work well with this. They have elements either side of the shutter.

If you can identify the thread on the lens...
Forum: General photography discussion 31st January 2019
Replies: 5
Views: 448
Posted By Petrochemist
Re: sensor protection

Several of the adapted lenses I use have no position for the locking pin, so the camera still thinks the lens isn't engaged when it's fully mounted...


I'd much rather have the camera work than...
Forum: General photography discussion 26th January 2019
Replies: 5
Views: 500
Posted By Petrochemist
Re: Camera versus The Human Eye

I suspect it might be because the ideal degree of curvature wanted varies with the lenses focal length...
Could be rather tricky with a zoom.
Forum: General photography discussion 26th January 2019
Replies: 13
Views: 457
Posted By Petrochemist
Re: Mapping/ aeriel photos

I've stitched several composites of 6 to 10 images from moving ships using ICE. All handled automatically, the only significant error being on a join that was 80% water & 15% sky - not leaving it...
Showing results 1 to 25 of 500

 
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