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Showing results 76 to 100 of 116
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Search: Posts Made By: petrochemist
Forum: General Photography Technique 05-09-11, 21:56
Replies: 14
Views: 25,818
Posted By petrochemist
Panning takes a good deal of practice (even...

Panning takes a good deal of practice (even without the need for steps!) I've been doing it at motorracing for years & still only get it right on a small proportion of shots :(

If you have the...
Forum: Photographic Accessories 31-08-11, 14:07
Replies: 2
Views: 12,733
Posted By petrochemist
I think the problem may be that you are using a...

I think the problem may be that you are using a linear polariser instead of a circular one. Many auto focus systems do not work with linear polarisers. A CPL has an extra stage to get round this.
Forum: Cameras 31-08-11, 13:47
Replies: 7
Views: 13,088
Posted By petrochemist
Paul I definitely recomend the screw in models...

Paul
I definitely recomend the screw in models over the Lee/Cokin style. IR filters block so much light that the stray light round the back of the filter will cause problems.

I've managed to get...
Forum: The Photography Forum 14-06-11, 22:32
Replies: 4
Views: 12,026
Posted By petrochemist
Tomorrow's Eclipse

I've not seen any messages here about it so I thought I'd post something in case anyone interested has not heard (or forgotten) about this photo opertunity.
July 15th is due to have one of the...
Forum: WPF Photo Competitions Forum 04-06-11, 13:15
Replies: 12
Views: 18,928
Posted By petrochemist
Unfortunately I cant take part. My camera...

Unfortunately I cant take part.
My camera doesn't go down as slow as 100ASA
Forum: Computers and The Internet 21-04-11, 17:01
Replies: 5
Views: 20,381
Posted By petrochemist
I've changed the motherboard & PSU etc on my old...

I've changed the motherboard & PSU etc on my old 486, on several occations, I'm still using the case for my main home PC...
Forum: General Photography Technique 29-03-11, 22:31
Replies: 5
Views: 14,047
Posted By petrochemist
Another thing you could try is making a rubbing...

Another thing you could try is making a rubbing from it (like a brass rubbing) or using water-based ink/paint to make a print directly of the stone. I'm not sure that either will help with the...
Forum: General Photography Technique 29-03-11, 18:37
Replies: 5
Views: 14,047
Posted By petrochemist
Oblique lighting will certainly help. IR is...

Oblique lighting will certainly help.
IR is reflected strongly by leaves so is unlikely to help with lichen.
It may be that UV will help but it is apparently difficult to do with modern setups.
...
Forum: The Photography Forum 20-03-11, 22:44
Replies: 24
Views: 38,889
Posted By petrochemist
Whilst it's no doubt a classic camera, I don't...

Whilst it's no doubt a classic camera, I don't think this really ranks as a vintage model. The 1B wasn't made before the 1959, so it's hardly even older than me!
My own Kodak lens (an Anastigmat...
Forum: Macro Photography Technique 06-03-11, 07:45
Replies: 14
Views: 95,456
Posted By petrochemist
I've used it with a microscope, (using the older...

I've used it with a microscope, (using the older Combine ZM) and have never had any problems with being too close.
I think the secret is not to adjust the focus but to move the camera, (or subject) ...
Forum: The Photography Forum 24-02-11, 09:38
Replies: 3
Views: 11,547
Posted By petrochemist
I've not heard of them doing this, have you tried...

I've not heard of them doing this, have you tried reformatting the card?
If the card has been used a lot, with multiple deletions/additions it can start to get very fragmented, which could cause...
Forum: Cameras 24-02-11, 09:33
Replies: 2
Views: 8,894
Posted By petrochemist
Unless you're trying to use it in low light...

Unless you're trying to use it in low light conditions the focus should be much quicker than that. Sounds to me as if the camera is faulty.
Forum: Cameras 20-02-11, 10:16
Replies: 21
Views: 27,570
Posted By petrochemist
If your after a lightweight dSLR, and don't want...

If your after a lightweight dSLR, and don't want to spend £700, then the Pentax Kr might be well worth considering. I believe it's significantly smaller than most APS competition and is around £350...
Forum: Macro Photography Technique 12-02-11, 00:20
Replies: 6
Views: 53,157
Posted By petrochemist
I'm not sure about the +1 part (I remember the...

I'm not sure about the +1 part (I remember the guide that when extension + focal length you get 1:1)
In addition I think it applies to having the lens focused at infinity. If the lens is focus...
Forum: Macro Photography Technique 11-02-11, 07:52
Replies: 6
Views: 53,157
Posted By petrochemist
Macro magnifications are usually calculated using...

Macro magnifications are usually calculated using the sensor size not a print out/screen display. Both the second two allow you to enlarge without increasing the information...
A full frame 35mm is...
Forum: Discussion on Photo of the Week 07-02-11, 18:23
Replies: 17
Views: 18,254
Posted By petrochemist
Fully deserving of the POTW recognition. A...

Fully deserving of the POTW recognition. A brilliant study, well done Mo.
Forum: Macro Photography Technique 04-02-11, 13:51
Replies: 6
Views: 65,806
Posted By petrochemist
Bear in mind too that most rechargable batteries...

Bear in mind too that most rechargable batteries loose significant amounts of charge while standing idle. Newer low self discharge types are MUCH better for intermittant use. NiMH batteries can often...
Forum: Lenses 04-02-11, 00:16
Replies: 6
Views: 16,831
Posted By petrochemist
What sort of 'something' are you referring to? ...

What sort of 'something' are you referring to?
Just about all lenses are capable of focusing on items at between 10' and infinity, though long telephotos might struggle to get as close as 10'.
...
Forum: Photographic Accessories 02-02-11, 11:14
Replies: 2
Views: 11,212
Posted By petrochemist
Yes they're the same.

Yes they're the same.
Forum: WPF Photo Competitions Forum 29-01-11, 20:21
Replies: 22
Views: 24,807
Posted By petrochemist
As one of the trial images I took the other night...

As one of the trial images I took the other night playing with another microscope is related I thought I may as well enter it :)
Forum: The Photography Forum 27-01-11, 13:37
Replies: 3
Views: 11,283
Posted By petrochemist
I'd expect plain black velvet would work rather...

I'd expect plain black velvet would work rather well, allowing you to capture pretty much just the jewellery in question. (Rich blues & reds can work well too if they complement the piece)
If you...
Forum: Photographic Accessories 17-01-11, 09:25
Replies: 4
Views: 23,876
Posted By petrochemist
I've got a similar set of cheapo ND filters (in...

I've got a similar set of cheapo ND filters (in Cokin P mount) quality seems reasonable for those, but they don't have any need for a screw thread.

ND8 should be 3 stops BTW, 1/8 as much light,...
Forum: Photographic Accessories 14-01-11, 11:19
Replies: 4
Views: 23,876
Posted By petrochemist
Extreme ND filters

The now seem to be a range of extreme ND filters available (for those times you want exposures in seconds or even minutes to average out images)
The ones I know about are:
B&W110 (about 7 stops)...
Forum: Cameras 03-01-11, 14:54
Replies: 12
Views: 29,041
Posted By petrochemist
As with all generalizations it's only part true. ...

As with all generalizations it's only part true.

The diffration problem with small apertures will soften the entire image, but DOF increases. In some cases the increased DOF heavily outways the...
Forum: The Photography Forum 29-12-10, 18:02
Replies: 9
Views: 10,092
Posted By petrochemist
I don't normally keep track of specific modern...

I don't normally keep track of specific modern photographers, but a couple do spring to mind, as they have struck me as particularly impressive:
The Swedish macro photographer, John Hallmén and...
Showing results 76 to 100 of 116

 
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