gordonpritchard

Lives in Canada Canada
Joined on Dec 12, 2007

Comments

Total: 75, showing: 1 – 20
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In reply to:

JackM: 200dpi is more than adequate for "photo quality"

You're confusing your terms.
Magazines prefer images to be supplied with a dpi/ppi that is 1x to 2x the lpi of the frequency of the halftone screen that will be used to print it.
LPI means Lines Per Inch = the frequency of the halftone screen.
If the image resolution (dpi/ppi) is below 1x the frequency of the halftone then the the halftone will resolve the image pixels - you see the "jaggies."
When magazines are printed with a 133-150 lpi halftone screen that translated into an image dpi range of 133-150 dpi to 266-300 dpi.
Details are here: http://the-print-guide.blogspot.ca/2009/04/image-resolution-for-printing-lpi-vs.html

Link | Posted on Jan 18, 2018 at 01:24 UTC
In reply to:

JackM: 200dpi is more than adequate for "photo quality"

It can be - depending on image content. 133-150 lpi was the standard in the past, however, Most magazines are now printed at 175 lpi, and quite a few use 20 - 25 micron FM screening which has an effective equivalent lpi of around 300 lpi.

Link | Posted on Jan 16, 2018 at 21:03 UTC
In reply to:

JackM: 200dpi is more than adequate for "photo quality"

Not if you're shooting for magazine/book reproduction.

Link | Posted on Jan 16, 2018 at 19:03 UTC

Time to dust off the old film day tricks, soft focus filters, custom apertures, gauze, etc.

Link | Posted on Jan 15, 2018 at 23:38 UTC as 61st comment
On article Canon patents 400mm F5.6 catadioptric 'mirror' lens (247 comments in total)
In reply to:

EXX: I still use a Minolta AF 500mm F8 Reflex on my Sony A77II.

Works like a charm with quite a snappy AF. It only supports the center AF point, but hey: it supports AF, unlike any other mirror lens.

Unfortunately all the nice AF-C tracking modes of the A77II do no work because of the single point AF.

Also, be careful with focus and recompose technique: your subject may get out of focus due to the small DOF. I just shoot with the subject in the center and "recompose" afterwards by cropping.

Pro:
- very compact and lightweight 500mm
- no CA
- no distortion
- has AF

Con:
- fixed at F8: so slow and no DOF control
- sometimes really hideous background blur
- low contrast. This is however easy to correct in post processing.

In my Gallery you can find an album with photos from this lens.

You can stop the lens down, get rid of the doughnuts and get greater depth of field by making your own aperture. Make a front lens cap. Cut a circular hole in the cap - off center and the width of the ring of the lens opening.

Link | Posted on Dec 17, 2017 at 20:00 UTC
On article Shooting Kīlauea Volcano, Part 2: Grounded (49 comments in total)

Any concern about the “ground” giving way and you falling into the lava?

Link | Posted on Dec 16, 2017 at 18:17 UTC as 13th comment | 2 replies

I hope he didn’t kill anyone when he hit the ground.

Link | Posted on Dec 14, 2017 at 18:46 UTC as 113th comment | 3 replies

Poor dog lost half its leg.

Link | Posted on Nov 28, 2017 at 20:48 UTC as 20th comment
In reply to:

bardick: I must ask, what does Time know about cameras? I suspect little to nothing.

Right, they don't have any photographers at TIME.

Link | Posted on Nov 25, 2017 at 05:56 UTC
On photo Hoar Frosted Trees in the Cold challenge (2 comments in total)

Gorgeous. The birds look quite exotic. Where was this shot?

Link | Posted on Nov 22, 2017 at 06:28 UTC as 2nd comment

Sacrilege.

Link | Posted on Nov 19, 2017 at 17:30 UTC as 122nd comment
On photo Wind chime on orchid show in the Furin Wind Chime challenge (8 comments in total)

I don’t want to sway the votes but I think we have a winner here.

Link | Posted on Nov 6, 2017 at 02:23 UTC as 3rd comment
On photo DSC_6941 in the One challenge (2 comments in total)

Where was this taken?

Link | Posted on Nov 5, 2017 at 03:06 UTC as 1st comment | 1 reply
In reply to:

PitchBlackPolo: Put can you do a frequency split...

Do you mean Frequency separation?
Yes, for quite a while: https://www.youtube.com/watch?v=J20_T-YQSYw

Link | Posted on Nov 4, 2017 at 01:10 UTC
On photo T-Bag Flower in the Tea as an art challenge (3 comments in total)

Well deserved.

Link | Posted on Nov 3, 2017 at 01:43 UTC as 3rd comment
On challenge Product Shoot: Hard Liquor (3 comments in total)

" so make sure the camera's logo can be seen and is readable"? What about the hard liquor's name/logo?

Link | Posted on Oct 30, 2017 at 04:42 UTC as 1st comment | 2 replies
On photo Leffe Beer in the Product Shoot: Beer challenge (19 comments in total)
In reply to:

virtualreality: I'm afraid it doesn't look like a nice glass of beer. Beer is cold when air is warm, so why no pearls on the outside of the glass? The white top is yellow instead of white, it's too small. The bubbles are too big. The pouring is a shame, this type of beer needs to be poured carefully and slowly. The glass is cheap, it has a wide edge. I would surely return this drink.

Because you said it was too small. I take pictures - I don’t pour beer. If that breaks the photo for you then so be it. In any case, I’m not inclinded to take photo advice from someone who has no photos in their gallery, hasn’t entered any challenges, has no listed photo equipment and who hides behind a pseudonym.

Link | Posted on Oct 29, 2017 at 12:10 UTC
On photo Leffe Beer in the Product Shoot: Beer challenge (19 comments in total)
In reply to:

virtualreality: I'm afraid it doesn't look like a nice glass of beer. Beer is cold when air is warm, so why no pearls on the outside of the glass? The white top is yellow instead of white, it's too small. The bubbles are too big. The pouring is a shame, this type of beer needs to be poured carefully and slowly. The glass is cheap, it has a wide edge. I would surely return this drink.

In some countries beer is served at room temperature - not cold.
The beer head is not always white. The color depends on the color of the beer and its height, among other things, is affected by how fast it’s poured. This is the head I got when I poured the beer. The glass is provided by the brewer so I assume they know what’s correct for their beer.
Which photo in this challenge is yours?

Link | Posted on Oct 28, 2017 at 21:34 UTC
On photo Leffe Beer in the Product Shoot: Beer challenge (19 comments in total)
In reply to:

stevo23: Exceptional.

I’ll drink to that!

Link | Posted on Oct 28, 2017 at 16:11 UTC
On photo Leffe Beer in the Product Shoot: Beer challenge (19 comments in total)
In reply to:

stevo23: Exceptional.

Thank you both. This type of challenge is very inspirational because you get to enjoy the subject after the shot is taken ;-)

Link | Posted on Oct 28, 2017 at 03:03 UTC
Total: 75, showing: 1 – 20
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