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Forum: Pentax eBooks 01-17-2023, 10:47 AM  
Sticky: Pentax eBook Downloads - Now on PF! (purchase here for instant access)
Posted By coboren3
Replies: 127
Views: 71,206
I was not able to access the download link to get my eBook I bought for $15.99. How do I access to access the correct download link for the KI/KII eBook?
Forum: Post Your Photos! 09-12-2017, 03:07 PM  
Night Northern LIghts: nature's light show
Posted By coboren3
Replies: 6
Views: 852
The first two shots seem to have a type of "bulls eye" aberration, concentric wavelike lines of light. Do you think it may be due to the K1 censor or the effect of long exposure?
Forum: Photo Critique 11-27-2016, 08:03 AM  
Abstract What can I do to improve this? How could I have taken it better?
Posted By coboren3
Replies: 9
Views: 1,388
Have you tried adjusting the brightness and contrast just a little bit? If you lower the brightness just a touch and raise the contrast a smidge, you can increase the perceived sharpness of the image.
Forum: Post Your Photos! 10-01-2016, 05:19 AM  
Nature 29 SEP 16 Old Moon
Posted By coboren3
Replies: 3
Views: 707
And you got little Mercury too.
Forum: Post Your Photos! 01-18-2016, 09:33 AM  
Macro They're back - snow crystals.
Posted By coboren3
Replies: 8
Views: 1,083
Fred,
Are these snow flakes or does the ambient humidity in the air create the actual crystal?
Have you tried a 2x teleconverter instead of an extension tube between the camera and Bellows?
Forum: Post Your Photos! 10-27-2015, 11:11 AM  
Macro Maple Leaf
Posted By coboren3
Replies: 0
Views: 679
Tried my hand at Macro Photography using a reversed zoom lens set at 35mm on my K5 @f22 and 1/180th (flash sync speed) and an old Vivitar 91 manual flash unit. The camera was set on an old Bogen tripod and a micro focusing rail to fine tune the focus since the depth of field was paper thin (Live View function does come in handy at times).
Forum: Canon, Nikon, Sony, and Other Camera Brands 08-11-2015, 05:20 PM  
50mm .95
Posted By coboren3
Replies: 40
Views: 3,856
A 55 mm lens set to 0.95 (for the sake argument let's say 1) f Stop and focused @10 feet has a depth of field of 4.56 inches (a calculated value). I would think that this would be very noticeable even in a low light situation. Most of us would want a bit more sharpness and stop down to f2, which is an f -Stop setting on most other 55 mm lens. So if f2 is used why buy a $850.00 lens that another less expensive lens can provide the same function, that is shoot at f2. If shutter speed is an issue, (example ISO 800 @ f1 = 1/1000 sec. noise notwithstanding) f2 yields 1/250 sec. should be sufficient.
Forum: Canon, Nikon, Sony, and Other Camera Brands 08-11-2015, 12:30 PM  
50mm .95
Posted By coboren3
Replies: 40
Views: 3,856
Is 0.95 f-Stop practical? Working exposure settings being what they are, a combination of quick shutter speeds and smaller f-Stops, where would there be a need to shoot wide open (@ f0.95). Depth of field would be very shallow in low light levels to use the faster shutter speeds.
Forum: Post Your Photos! 06-22-2015, 08:48 AM  
Misc The Moon, Jupiter and Venus
Posted By coboren3
Replies: 1
Views: 865
This was take on the evening of 6-20-15
Forum: Post Your Photos! 06-22-2015, 08:32 AM  
Landscape The Moon, Jupiter and Venus from my driveway
Posted By coboren3
Replies: 1
Views: 839
I wanted to shoot this astronomical gathering over the two days the Moon was going to be close to the two planets, Jupiter and Venus. However the remnants of tropical storm Bob spoiled the night of 6-19-15 so I had to settle for the 6-20-15 evening. Glad I did.
Forum: Photo Critique 05-05-2015, 09:30 AM  
Nature Picture Critique Request
Posted By coboren3
Replies: 5
Views: 1,058
I don't think I'd split the picture in half with the horizon (meadow and sky), I'd place it in the the lower third or the upper third but not in the middle depending on what's more interesting to look at.
Forum: Post Your Photos! 04-28-2015, 06:17 AM  
Nature Robin on the nest.
Posted By coboren3
Replies: 4
Views: 850
I should mention that there are now 4 sky blue eggs in the nest.
Forum: Post Your Photos! 04-27-2015, 07:45 PM  
Nature Robin on the nest.
Posted By coboren3
Replies: 4
Views: 850
Well given the fact that the dog might have something to say... yes!
Forum: Post Your Photos! 04-27-2015, 04:34 PM  
Nature Robin on the nest.
Posted By coboren3
Replies: 4
Views: 850
I photographed this Robin who chose to nest on the pool pump cover from my brother's dining room.
Forum: Post Your Photos! 10-09-2014, 08:33 AM  
Nature the Hummingbird Moth
Posted By coboren3
Replies: 17
Views: 2,438
Where were these taken geographically speaking? I've only see one at my cottage in Roscommon Mi.
Forum: Post Your Photos! 09-30-2014, 08:02 PM  
Night Curious Attempt at Astrophotograhy
Posted By coboren3
Replies: 31
Views: 3,564
Need more info, where are you? Northern or southern hemisphere? Which direction did you take the shot, North, South and at what time (your location can tell a lot? Second shot looks like ISS.
Forum: Post Your Photos! 09-22-2014, 06:20 AM  
Pets Nancy (With the Laughing Face)
Posted By coboren3
Replies: 2
Views: 800
If ever there was a picture of a dog;s expression asking the question "Why are we sitting around doing nothing, let's go out and have some fun" it's the first shot.
Forum: Post Your Photos! 09-05-2014, 10:46 AM  
Nature Summer-mushrooms-withBW-bear
Posted By coboren3
Replies: 8
Views: 958
very imaginary series of shots, how about a wee Leprechaun or two, perhaps a woodland faerie or elf?
Forum: Post Your Photos! 08-10-2014, 06:00 AM  
Nature A week of hummingbird adventures in Arizona and at home
Posted By coboren3
Replies: 15
Views: 2,175
Amazing! Any tech data as to the lens used?
Forum: Photo Critique 08-08-2014, 01:05 PM  
Nature Beginner photography help needed
Posted By coboren3
Replies: 12
Views: 1,241
Beginning a beginner you could research something called the rule of thirds when it comes to compassion. The stork, lama's face and the depression if the mountain side are in the center of the frame. see: https://www.google.com/search?q=rule+of+thirds+photography&espv=2&tbm=isch&t...w=1680&bih=859 for the effect it has on pictures and Rule of Thirds - Digital Photography School for the explanation. It should help.
Forum: Post Your Photos! 08-06-2014, 07:32 PM  
Misc Something DIfferent - Film
Posted By coboren3
Replies: 12
Views: 1,155
I haven't seen a Zone VI view camera in ages. Made me take out my Takahara and stare at it.
Forum: General Photography 07-31-2014, 08:13 AM  
It started with this little toad...
Posted By coboren3
Replies: 16
Views: 1,940
This really is an interesting story. Has potential as a type of photographic comic strip. Hope you send the lens back to sigma with the photo-narrative, they might feel sorry for you enought to repair it for free. Or turn it into a commercial for their lenses.
Forum: Post Your Photos! 07-31-2014, 08:04 AM  
Landscape Dieng, village above the clouds
Posted By coboren3
Replies: 2
Views: 809
Interesting star trails in the top picture. Never thought about how they would look taken from a location at the equator.
Forum: Photo Critique 07-26-2014, 06:21 AM  
People colour or black and white
Posted By coboren3
Replies: 11
Views: 1,304
The B&W seems to lack some luster. Contrast needs to be increased.
Forum: Post Your Photos! 07-26-2014, 06:17 AM  
Macro A few recent British butterflies
Posted By coboren3
Replies: 4
Views: 802
Very sharp images for hand held manual focusing, where were they taken?
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