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Forum: Pentax Forums Giveaways 09-08-2016, 03:06 AM

PF 10th Anniversary - Pentax K-50 1-Day Giveaway! - Entries closed, winner announced.
Posted By erf

Replies: 1,825
Views: 91,562

yeah!

Forum: Pentax Forums Giveaways 12-14-2014, 01:18 AM

3 Million Post Giveaway: Confirm your entry!
Posted By erf

Replies: 2,853
Views: 134,277

roll on monday...

Forum: Pentax Forums Giveaways 12-10-2014, 04:05 AM

Win an FA 31mm Ltd: PF 3 million post giveaway!
Posted By erf

Replies: 2,237
Views: 144,672

Count me in too please!

Forum: Pentax SLR Lens Discussion 07-06-2011, 02:33 PM

Mirror lens vs teleconverter better?
Posted By erf

Replies: 35
Views: 7,966

The 28-200mm is f/5.6 at the long end. With a 2x teleconverter that's f/11 which will make it very hard for the autofocus to work.

Mirror lenses are bulky rather than heavy, and I think they're all manual focus. You're aware of the doughnut shaped out-of-focus highlights from a mirror lens?

Forum: Troubleshooting and Beginner Help 07-01-2011, 02:51 PM

Olympus Ps200 Flash
Posted By erf

Replies: 3
Views: 5,345

No!

Its trigger voltage appears to be 185V, but why not measure it and make sure for yourself?

I generally use the Botzilla website for this info:
Photo Strobe Trigger Voltages

Not that the Sunblitz is listed...

Forum: Pentax SLR Lens Discussion 06-23-2011, 03:24 PM

Will an "M" series lens work on the K-r?
Posted By erf

Replies: 29
Views: 2,727

It's not the mirror which cycles when you press the green button, it's the aperture that stops down to your chosen value so that the light meter can take a reading. That's why the viewfinder goes dark. Note that's dark, not black, unless you've chosen f/32 indoors in a room with only one bulb!

If the mirror flipped up the light meter wouldn't get any light at all.

Forum: Troubleshooting and Beginner Help 06-23-2011, 02:02 PM

Samsung lenses on pentax
Posted By erf

Replies: 9
Views: 14,498

I don't see a reason to give up, there are quite a few that fit, for example (from wikipedia):

Schneider-Kreuznach D-Xenogon 35mm f2 (2006-) (rebadged SMC PENTAX-FA 1:2 35mm AL, 1999-)
Schneider-Kreuznach D-Xenon 18-55mm f3.5-5.6 AF (2007- ) (rebadged SMC PENTAX-DA 1:3.5-5.6 18-55mm AL, 2004- )
Schneider-Kreuznach D-Xenon 100mm MACRO 1:2.8 (2007-) (rebadged SMC PENTAX-D FA 1:2.8 100mm MACRO, 2004-)
Schneider-Kreuznach D-Xenogon 10-17mm F3.5-4.5 ED (2007- ) (rebadged SMC PENTAX-DA FISH-EYE 1:3.5-4.5 10-17mm ED (IF), 2006-)
Schneider-Kreuznach D-Xenon 12-24mm f4 ED (2007- ) (rebadged SMC PENTAX-DA 1:4 12-24mm ED AL (IF), 2005-)
Schneider-Kreuznach D-Xenon 50-200mm f/4-5.6 AF (2006-) (rebadged SMC PENTAX-DA 1:4-5.6 50-200mm ED, 2005-)

There may be others.

Forum: Sold Items 06-22-2011, 03:35 PM

For Sale - Sold: Vivitar 24mm f/2 Manual Focus Lens (CONUS)
Posted By erf

Replies: 5
Views: 3,147

If it has an "A" position on the aperture ring it can't be M42.

---------- Post added 06-22-11 at 11:45 PM ----------

There looks to be a useful page on FoV here:
https://www.pentaxforums.com/forums/pentax-lens-articles/90477-crop-factor-fo...ield-view.html

Forum: Troubleshooting and Beginner Help 06-22-2011, 03:27 PM

Is it the camera or the lens cuasing this?
Posted By erf

Replies: 13
Views: 2,162

That's a good point actually. Is the unexposed part on the left or right (shutter curtain problem) or at the bottom (sticky mirror)?

Forum: Troubleshooting and Beginner Help 06-22-2011, 01:23 PM

Is it the camera or the lens cuasing this?
Posted By erf

Replies: 13
Views: 2,162

I've had that on an MX with a slightly sticky mirror.

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