Forgot Password
Pentax Camera Forums Home
 

Showing results 1 to 25 of 300 Search:
Forum: Lens Clubs 07-02-2019, 06:49 PM  
The Raynox Macro club
Posted By audiobomber
Replies: 871
Views: 258,140
Well, physics is the same for everyone. :)

Using a high quality prime with a Raynox makes good sense for best IQ. Using minimum focus distance exclusively makes sense if magnification is the only goal. However there are times when subject distance becomes more important to me than maximizing magnification, i.e. with skittish or hazardous subjects.
Forum: Lens Clubs 06-30-2019, 05:52 AM  
The Raynox Macro club
Posted By audiobomber
Replies: 871
Views: 258,140
Diopter magnification is affected by the focal length of the host lens. If your lens suffers from focus breathing (focal length changes as focal distance changes), you can end up with significantly less magnification at close focus. For example the 18-250mm's actual focal length is only about 70mm (IIRC) when set to 250mm and minimum focus. Macro magnification is weak at 250mm and MFD.

If I have a Raynox mounted on a zoom lens, I use infinity focus and vary the focal length for magnification. If I have a prime mounted, I use the focus ring to vary magnification.
Forum: Photographic Industry and Professionals 05-04-2019, 07:01 AM  
Unpopular Opinions From Current Industry Professionals
Posted By audiobomber
Replies: 79
Views: 4,008
A lens hood mounted backwards doesn't make you look cool, it makes you look like an ignorant noob.

Probably not an unpopular statement, but I'm feeling cranky this morning.

90% of the time when I see someone with the hood facing the wrong direction, it's a Canon shooter.
Forum: General Talk 03-14-2019, 03:14 PM  
The Joke Thread
Posted By audiobomber
Replies: 1,543
Views: 130,365
People say that cats hate baths.
I gave my cat a bath and she loved it.
But it took two days to get all the cat fur off my tongue.
Forum: General Talk 12-28-2018, 03:25 PM  
The Joke Thread
Posted By audiobomber
Replies: 1,543
Views: 130,365
Shouldn't that be "wurst"?

Anyway, I disagree. Long-winded puns are the worst. (This is not a joke, don't try to figure out an alternate meaning.)
Forum: Pentax DSLR Discussion 10-15-2018, 09:08 PM  
The K20D Club
Posted By audiobomber
Replies: 487
Views: 72,918
I went from a K100D Super to a K20D and I agree, it was major.

I've since owned a K-x, K-01 and K-5. I currently own a K-3 and still use the K20D. All the rest are gone. That's because the K20D is a better camera than all the others IMO, though not as good as my K-3.
Forum: Pentax SLR Lens Discussion 10-15-2018, 07:26 AM  
the limiteds do they live up to the reputation and why
Posted By audiobomber
Replies: 246
Views: 26,982
The FA 35mm is actually sharper than the DA 35 macro:

http://www.opticallimits.com/images/8Reviews/lenses/pentax_35_2/mtf.gif

http://www.opticallimits.com/images/8Reviews/lenses/pentax_35_28/mtf.gif

The main reason I chose the FA 35 was the extra stop. For close focus I can just pop a Raynox 250 on the end of the FA 35 (or better yet, use my DFA 100mm). To get 1:1 focus on a DA 35mm, you almost have to be touching your subject with the lens.
Forum: Pentax SLR Lens Discussion 08-31-2018, 06:40 PM  
the limiteds do they live up to the reputation and why
Posted By audiobomber
Replies: 246
Views: 26,982
I had both as well and there was one photographically significant difference. The XS has double the CA of the Limited, as shown at DXOMark and referenced in the PF review. The CA was too much for me and was not removed easily in post. Also, I always use a hood to minimize flare, and that more than negates the XS size advantage. Sure, the lens is somewhat resistant to flare, but the difference between ther Limited with hood and bare XS was clearly visible, even indoors.
Forum: General Talk 08-30-2018, 09:56 PM  
The Joke Thread
Posted By audiobomber
Replies: 1,543
Views: 130,365
Good one bigdavephoto. I'm going to borrow some of your prose.

Jesus and Moses were playing a round of golf. On the first tee, Jesus swings. The ball flies down the fairway about 100 yards. A squirrel came running out of the bushes, picked the ball up in it's mouth, and started to run down the fairway. About half way down the fairway, an eagle flew down and grabbed the squirrel and took off. About the time the eagle reached the green, a bolt of lighting flashed out of the clear blue sky and scared the eagle causing the eagle to drop the squirrel. The squirrel hit the ground with the ball still in it's mouth. The squirrel got up, ran across the green and dropped the ball into the hole.

Moses says "JESUS CHRIST, ARE YOU GOING TO F*** AROUND OR PLAY GOLF?

---------- Post added 2018-08-31 at 01:17 ----------

In a similar vein...

A man fan dies and goes to heaven. St. Peter, knowing the man is a huge fan of rock music, asks if he would like to see heaven's band. Of course the man eagerly agrees. The band consists of Keith Moon and John Bonham on drums, Jack Bruce and John Paul Jones on bass Jimi Hendrix, Duane Allman and Eric Clapton on guitar, Greg Allman and Billy Preston on organ and vocals. As he's watching this amazing lineup, he says to St. Peter, "This is awesome, but I didn't know that Eric Clapton was dead."
St. Peter says "Oh he's not. That's just God. He thinks he's Eric Clapton."
Forum: Photographic Technique 08-14-2018, 10:43 AM  
Focus help with K-3 birds in flight
Posted By audiobomber
Replies: 47
Views: 6,151
I can't agree with AF-S for birds in flight. May work fine if the bird is flying horizontally. If it is flying toward you, by the time you focus and get the shot off, the head will likely be out of the focal plane. You're much better off with AF-C and expanded area, let the camera assist with
tracking.

https://www.pentaxforums.com/forums/26-mini-challenges-games-photo-stories/6...ml#post4400157
Forum: Mini-Challenges, Games, and Photo Stories 08-07-2018, 06:46 AM  
BIF Photography
Posted By audiobomber
Replies: 1,191
Views: 134,310
Trumpeter swan K33 made three passes at a pool before landing. I got about 60 well-focussed BIF's. (K-3 and DA 55-300mm PLM).
Forum: Photographic Technique 07-29-2018, 02:58 PM  
Focus help with K-3 birds in flight
Posted By audiobomber
Replies: 47
Views: 6,151
I don't see that fewer AF points should matter. When using extended area AF, initial acquisition is concentrated on the specified point only. The outer points are not in play.

I do use the 9-point array, expanded area AF for sports, where the target is not moving so quickly. With a BIF however, I can not keep the bird in the center, so the outermost points are best kept in play.
Forum: Pentax SLR Lens Discussion 07-17-2018, 08:22 PM  
the limiteds do they live up to the reputation and why
Posted By audiobomber
Replies: 246
Views: 26,982
I was doing that, now I use a generic 40.5mm pinch cap. I was concerned that constantly pushing the film cap in and out might wear the paint over time.
Forum: Pentax SLR Lens Discussion 06-26-2018, 11:22 AM  
the limiteds do they live up to the reputation and why
Posted By audiobomber
Replies: 246
Views: 26,982
The K-3 is about as good as it gets for DXOMark APS-C lens scores. There are three things that affect DXOMark sharpness scores:
  • Sensor size (larger sensors score higher, all else being equal)

  • Number of pixels (more pixels = higher resolution, all else being equal)

  • Anti-aliasing (blur) filter. The stronger the blur filter, the lower the sharpness score, all else being equal.


The Overall Score is an unknown combination of measurements. I consider the Overall Score to be DXO's opinion on desirability of a lens, when used on the specified camera. It is a coarse and questionable measure. Even the other scores (sharpness, vignetting, etc) are limited in usefulness. The graphs are much more informative.

Note that DXO does not consider lens rendering or bokeh. What they do provide is useful, but certainly not the final authority on what lens to choose.
Forum: Photographic Technique 06-24-2018, 06:06 AM  
Focus help with K-3 birds in flight
Posted By audiobomber
Replies: 47
Views: 6,151
A bit more explanation is warranted here.

When you half-press the shutter in Expanded Area AF-C mode, the camera tries to find focus on the central point. As soon as focus is confirmed, you need to take the shot. If you don't take the shot, the camera assumes that it has selected the wrong target, and starts to search adjacent points. When you take the shot, the camera records the shape and colour of the object in focus and begins tracking. It tracks until you let up on the shutter button.

If you have accidentally focussed on something other than the subject, say a cloud in the background, that is what the camera will track. If this happens, you need to stop and restart tracking by letting up and re-depressing the shutter button. This is called focus bumping. Sometimes the camera loses focus during a sequence. This again calls for focus bumping. IME, the K-3 is very good at tracking with the settings I listed above, and given a fast focussing lens like the DA*300 or 55-300mm PLM. Tracking a BIF with the older 55-300mm lenses is possible, but you will have a lot more missed opportunities.

https://www.pentaxforums.com/forums/38-photographic-technique/332226-focus-h...ml#post3806571
Forum: General Talk 06-23-2018, 06:10 AM  
The Joke Thread
Posted By audiobomber
Replies: 1,543
Views: 130,365
A farmer and his wife were watching their herd of cattle.

Farmer's wife: Why can't you be more like that bull? He makes love 365 days a year.

Farmer: With the same cow?
Forum: Pentax KP 04-12-2018, 07:32 PM  
KP size compared to Olympus?
Posted By audiobomber
Replies: 51
Views: 6,506
I have no trouble at all holding my K-3 with one hand, thoughI do like the tilt LCD on my a6000.
Forum: Video and Pentax HDSLRs 03-22-2018, 11:38 AM  
Mirrorless 4k video option for Pentax lenses
Posted By audiobomber
Replies: 124
Views: 12,152
I have four NEX to PK adapters. All support auto ISO, exposure compensation and focus peaking on my a6000 and I can move the AF point all over the frame. The only difference between shooting with a Pentax lens and a Sony is that I don't have AF and electronic aperture control.
Forum: General Talk 03-10-2018, 07:58 PM  
Favorite movie "scene"
Posted By audiobomber
Replies: 218
Views: 15,491
Can any movie do justice to a book? How long does it take to read a book? How long does it take to watch a movie?

Catch-22 was a mindbender. I loved it, along with novels I consider to be similar; Slaughterhouse 5, Mash and not on topic, but similar in style, Catcher In The Rye.
Forum: Video and Pentax HDSLRs 03-05-2018, 08:11 AM  
Mirrorless 4k video option for Pentax lenses
Posted By audiobomber
Replies: 124
Views: 12,152
The reviewer is correct, the m4/3-PK version can only control aperture using the aperture ring on the lens. If your lens has no aperture ring, it remains fully closed.

He's not too clear on crop factor, but it's not hard to determine. The focal reducer is .72X, so that is how it impacts both focal length and aperture. A 50mm f1.4 on FF becomes 100mm f2.8 equivalent on m4/3, and 72mm f2.0 equivalent with the Roxsen on a m4/3 camera.

He's a bit too generous regarding impact on IQ, the extra glass does increase aberrations (flare, CA, field curvature, distortion, coma). Whether this bothers you depends how fussy you are, and on the lens being used. Veiling flare especially becomes much more likely. Use a good lens and a hood at all times. I don't shoot video, but I believe it is far less demanding regarding sharpness and aberrations compared to stills shooting, so that may explain his views on IQ with the Roxsen.
Forum: Video and Pentax HDSLRs 02-18-2018, 10:34 PM  
Mirrorless 4k video option for Pentax lenses
Posted By audiobomber
Replies: 124
Views: 12,152
Theoretically, you should gain .72 stops with the RJ Turbo, but in practice I get only 1/2 stop.
Forum: Pentax SLR Lens Discussion 02-15-2018, 10:15 AM  
Teleconverter challenge Sigma vs Kenko vs Tamron X1.4
Posted By audiobomber
Replies: 56
Views: 10,882
I have the same Kenko, as well as the Pentax 1.4X. The Pentax TC is slightly superior in IQ but radically better for auto-focus with in-lens motors.
Forum: Pentax KP 02-14-2018, 07:28 AM  
KP size compared to Olympus?
Posted By audiobomber
Replies: 51
Views: 6,506
I hope the trend does not continue. I'd much rather pull out a remote than play around with an app and phone.
Forum: Pentax SLR Lens Discussion 02-13-2018, 02:40 PM  
Teleconverter challenge Sigma vs Kenko vs Tamron X1.4
Posted By audiobomber
Replies: 56
Views: 10,882
IQ is very good and it is FF compatible. AF is good with screwdrive lenses but not with in-lens motors.

Why do you want a TC with attendant IQ and AF compromises vs. shooting in crop mode?
Forum: Pentax KP 02-13-2018, 06:35 AM  
KP size compared to Olympus?
Posted By audiobomber
Replies: 51
Views: 6,506
Are you saying the KP does not allow IR remote shutter release? That would be difficult to believe because even my old K100D Super had that capability.

I have a Sony a6000 for its small size, but it cannot replace my K-3, it is a supplement only.
Search took 0.04 seconds | Showing results 1 to 25 of 300

 
Forum Jump


All times are GMT -7. The time now is 01:35 AM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top