petrochemist

Joined: 27th February 2010

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petrochemist
cardiffgareth wrote:
Won on a well known internet auction a Sigma 24-70mm. In the listings the images showed the lens hood attached but when it arrived there was no lens hood. Annoying as I've now messaged the seller 3 times and they haven't responded to them
The goods are therefore not as described & you can get a partial refund. Failure to respond will only reinforce your position there.

Comment by petrochemist posted on What's your latest acquisition? at 22/04/2019 - 11:03

petrochemist
I've just unintentionally splashed out on another telescope. I placed a minimal bid as a marker & won the auction for a penny!
Admittedly it's not a top quality job, but it should provide a few components to play with. I might even replace the eyepiece holder with a connector for a M42 helicoid

Comment by petrochemist posted on What's your latest acquisition? at 12/04/2019 - 20:18

petrochemist
Mike-P wrote:

1. Correct
2. Pointclear
3. Correct
4. Same as number 2 just a different direction
5. Correct
6. Cudmore Grove country park


Thanks to everyone for their comments.
About a kilometre out for no 2 then, not too bad considering the lack of landmarks, but I really should have got no 4.
Although Cudmore Grove is only about a mile from point clear, it's quit a long drive round - over 20 miles. Did you take the passenger ferry ? I've never been on it myself

Shame I wasn't around to offer you hospitality, I was in Lincolnshire testing kart fuel that weekend.

Comment by petrochemist posted on A few days in Essex at 08/04/2019 - 13:39

petrochemist
Very much my neck of the woods, which has given me the challenge of trying to identify the locations.

No 1 is easy, from Coast road West Mersea around 100m east of the Victory.
No 2 feels like a view from Batesmans Tower at Brightlingsea. I've shot similar sunsets there recently, but without the trimaran.
No 3 must be be the Martello tower at Jaywick (it's the only one I remember with the banking round it)
I can't place No 4 - I suspect its a bit further down the coast. there are features that make me think Brightlingsea, but the houses are wrong.
No 5 is just 10 minutes away from me now the leading lights at Dovercourt beach
Sorry no 6 is beyond me, a common sight in my parents garden, but I doubt that's where you took it!

How did I do?

Comment by petrochemist posted on A few days in Essex at 02/04/2019 - 14:01

petrochemist
ilovesaabs wrote:
They might do, but is it a bad thing?

For most focal lengths Pentax have the lens model you'll ever want, and without the fear your lens will need to be sent for modification (ie K-1 lens mount or firmware update which makes 3rd party lenses inoperable).

The second reason is why I have either Pentax or Nikon branded lenses for my cameras.
Yes definitely a bad thing.
More options is always good, and having the major 3rd party suppliers drop them will discourage new uses from going for Pentax.

Comment by petrochemist posted on Telephoto lenses at 04/02/2019 - 11:21

petrochemist
I think I'd have been tempted to walk out after commenting we'd booked a photographer rather than his camera.
Since I'm our club's treasurer, If I walked out he wouldn't have been paid for his visit - seems about right

Comment by petrochemist posted on Club photographers at 08/12/2018 - 20:59

petrochemist
Some of the shots are quite effective & rather abstract

I'm not sure the results are worth the level of work involved, but I guess photoshop probably has easy ways of doing this...

kea828 wrote:

Could this effect be made by using multiple exposures?
Not really from multiple exposures in the film way, simply combining multiple shots on the same negative. Exposure differences would either blow out the background or make the bird too faint a different blend mode is needed. From the comment you quoted they have been done by multiple exposures.

Comment by petrochemist posted on I saw this on another forum at 24/11/2018 - 20:03

petrochemist
I believe that windfarm is Gunfleet 1&2 just off Clacton.
It seems even on a fine day like this one my house is hidden by one of the thickest portions of cloud. It's under there somewhere in your 3rd photo.

Nice images, TFS

Comment by petrochemist posted on From a plane.... at 19/11/2018 - 16:21

petrochemist
Millimeters are the preferred SI unit of length that is appropriate for typical lenses. Centimeters while still a recognized SI unit have not been a preferred unit since the old CGS reference was replaced by MKS back in the 1940s. The full SI system being adopted in the 1960s
Older lenses are often marked in cm or inches. Using the base unit of the meter would give us nasty decimals for nearly all lenses. (Less than 1% om my 'lenses' have round figure focal lengths in meters, both of these are actually telescopes one 1m-4m with the eyepiece & the other fixed at 1m without an eyepiece).

Preferred multipliers are multiples of 1000, giving us:
Kilo, Mega, Giga, Terra, Penta... going up
& milli, micro, nano, pico, femto... going down.

Comment by petrochemist posted on Why millimetres? at 29/10/2018 - 18:00

petrochemist
Ring flash arrived safely this morning.
It's very much better than the old one I have somewhere.
Thanks a lot David!

Comment by petrochemist posted on FS various items at silly prices(!) at 10/10/2018 - 13:06

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