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Forum: Lens Clubs 07-14-2021, 12:06 PM  
Takumar club
Posted By rhodopsin
Replies: 18,987
Views: 3,712,341
Forum: Troubleshooting and Beginner Help 07-14-2021, 11:54 AM  
What kind of Sun Lens is this?
Posted By rhodopsin
Replies: 11
Views: 768
What they said. :)

The PE does indeed indicate Pentax Screwmount.

Can you show the front of the lens please? We may be able to say who made it, and when.
Forum: Welcomes and Introductions 09-20-2020, 01:25 PM  
Working on new Ultimate Asahi Pentax Guide
Posted By rhodopsin
Replies: 47
Views: 6,827
Me too. :) I'd compare the M42 Yashinon 1:2/55 with Auto-Takumar 1:2/55, however.

There is ongoing debate here Takumar Field Guide

I agree with comment there "The Auto-Yashinon lenses were manufactured by Asahi Optical Company factory makes more sense?"

Also, the site Takumar Field Guide - Blog is best I've seen so far.
Forum: Welcomes and Introductions 09-19-2020, 08:15 AM  
Working on new Ultimate Asahi Pentax Guide
Posted By rhodopsin
Replies: 47
Views: 6,827
Is the Tomioka made Yashinon 5cm f/2 the same as Auto-Takumar 1:1.8 / 55 as claimed by

? YASHICA?AUTO YASHINON 5cm/f2?M42?vs Asahi Opt. Co.,?Auto – Takumar 55mm/f1.8 zebra?M42?
Forum: Troubleshooting and Beginner Help 08-20-2020, 09:58 AM  
Adapter to use AF lenses on Sony or Fuji mirrorless
Posted By rhodopsin
Replies: 5
Views: 1,178
Wait for somebody to make an AF adapter for Pentax AF lenses?

Those Sigma lenses may be available in the new camera mount.

Changing cameras, get the best you can afford.

Bigger pixels are better imho.

The field of view is drastically different on FF.

My APS-C camera didn't get used after FF purchase.
Forum: General Photography 08-19-2020, 10:28 AM  
"mflenses.com has expired" ?
Posted By rhodopsin
Replies: 27
Views: 3,225
However there is detailed information in the forum for more lenses than are in the one here on PF.
Forum: General Photography 08-19-2020, 06:32 AM  
"mflenses.com has expired" ?
Posted By rhodopsin
Replies: 27
Views: 3,225
Forum: General Photography 08-18-2020, 12:56 PM  
"mflenses.com has expired" ?
Posted By rhodopsin
Replies: 27
Views: 3,225
Thanks for topic. Attila email bounces. Emailed Klaus. Not reply yet.
Forum: Troubleshooting and Beginner Help 07-19-2020, 11:48 AM  
K3-II producing purple images
Posted By rhodopsin
Replies: 17
Views: 1,648
LOL!

Rather than sensor, problem can be caused by any components in the Green signal path.
Forum: Troubleshooting and Beginner Help 07-13-2020, 08:25 AM  
What's wrong with my front element?
Posted By rhodopsin
Replies: 19
Views: 1,790
These fit inside front of lens to remove name rings from Takumars:

Rubber Repair Tool Set Ring Filter Removal Spanner Wrench | eBay


image by ebay seller jiakgong
Forum: Troubleshooting and Beginner Help 07-12-2020, 01:09 PM  
K3-II producing purple images
Posted By rhodopsin
Replies: 17
Views: 1,648
Welcome Teddy13

Agree green is missing. Cause remains unknown. Maybe settings got bumped.

Check White Balance settings? Try resetting camera?

Hardware problem maybe Pentax Service can help.
Forum: Troubleshooting and Beginner Help 07-11-2020, 12:52 PM  
What's wrong with my front element?
Posted By rhodopsin
Replies: 19
Views: 1,790
Water condensation. Probably disappears when lens is warmer or humidity is lower. Recondenses when lens gets cold or humidity is greater. Continual evaporation and condensing cycles lead to deposits of micro dust which provide fungal growth environment.

Suggest drying lens in sealed box surrounded by fresh Silica Gel packets for a week.

Remember to seal a cold lens against moisture condensation before moving into warmer environment.
Forum: Welcomes and Introductions 06-29-2020, 02:21 PM  
Working on new Ultimate Asahi Pentax Guide
Posted By rhodopsin
Replies: 47
Views: 6,827
Thanks for the peek!

A project maybe of interest 29 Versions of the 55mm Asahi Takumar M42 Screw Mount Lenses
Forum: Welcomes and Introductions 06-26-2020, 09:23 AM  
Working on new Ultimate Asahi Pentax Guide
Posted By rhodopsin
Replies: 47
Views: 6,827
Woo Hoo!!! Thank you so much!!!

Good to see you here.

My signed first edition is falling apart from so much use.

I wonder what has been corrected, what will be new? I'll wait to see. :)
Forum: Pentax SLR Lens Discussion 02-11-2017, 02:45 PM  
500/4.5 SMC Takumar infinity focus issues?
Posted By rhodopsin
Replies: 19
Views: 4,332
Gerjan says the S-M-C 1:4.5/500 focus just past infinity.

I did adjust mine, however not using any screwdrivers. I did have to try many helical threading combinations to get part of the inner rear element group to gain 1mm more movement range. The two helicals need to be threaded onto correct positions from their maximum range of motion to allow full range of focus adjustment to include infinity & a little beyond -- that must seem like gibberish unless you have done it. :lol:

The improvement in infinity photo quality is easy to see; compares with quality closer.

Tip: Photograph a distant laser point to see how still is the camera mounting system.

For some fun mount the laser on the camera & walk over to the laser point to watch it move as an assistant simply walks the ground near the tripod!
Forum: Post Your Photos! 11-23-2014, 06:10 AM  
Nature Birds in clean & green background
Posted By rhodopsin
Replies: 13
Views: 1,076
I'm on dial-up internet so images load slow...as they load I'm wondering has somebody got birds on green screen? why would anybody want that -- pasting would require a lot of skill or luck? After I begin to see images with shallow dof against oof greenery...

#2 is clever but you can do much better than that. Is center bird different?!

#5 is FABULOUS

#4 is AWARD WINNER -- submit everywhere to win awards!!!
Forum: Pentax SLR Lens Discussion 11-23-2014, 06:03 AM  
I need recommendations on a good quality Pentax lens. Not another 50mm. Thanks.
Posted By rhodopsin
Replies: 17
Views: 2,230
+1 Fast prime for portraits. I assume you say not another 50mm because you already have it -- 50mm is perfect portrait focal length for your camera -- if too close then +1 the 77mm...

If you want more reach for your other photo-making, +1 the 70-210.

Sandy Hancock you give good advice!
Forum: General Talk 05-31-2013, 08:42 PM  
What music are you currently listening to?
Posted By rhodopsin
Replies: 11,000
Views: 751,574
One From The Vault -- Great American Music Hall, San Francisco, 8-13-1975

Exceptional audio quality live concert recording
Forum: Pentax Camera and Field Accessories 03-10-2013, 04:21 PM  
UV filters - yes or no - which ones?
Posted By rhodopsin
Replies: 13
Views: 1,483
UV filter _might_ be needed at high altitudes where UV light can be intense, even overload blue channel.

UV filter protects lens from blowing sand, etc..

UV filter, even the very best, are prone to reflections.

In general, if a UV filter is necessary, use the very best to minimize IQ degrade from using it -- of course if a filter is used to avoid sacrificing the lens, consider roe. ;)

I use hoods instead of protective filters, except around blowing sand, when I use hood and filter.
Forum: Pentax SLR Lens Discussion 03-10-2013, 06:27 AM  
Did I just get a bargain?
Posted By rhodopsin
Replies: 10
Views: 1,727
Mount those Minolta-mount lenses on a Nex. Used Nex-3 go for ~US$200 (or less :))
Forum: Pentax SLR Lens Discussion 03-09-2013, 06:03 PM  
Problems with Super Takumar 50mm 1.4 on 5DmkII
Posted By rhodopsin
Replies: 34
Views: 5,572
Latest info on SP 90 "spot", from somebody who talked with Tamron employee at a trade show, is the rear compensator group of elements is uncoated (thus the reflections), that the lens is designed for low contrast lighting at high magnifications. I suspect other lenses that exhibit these spots have uncoated elements.



Thorium doped glass is well known, however, Gerjan van Osten says, in "The Ultimate Asahi Pentax Screw Mount Guide" (1999), there is thorium in one of the coatings. Since Mr. van Osten had access to Asahi Pentax personnel and documentation, I tend to believe him.
Forum: Pentax SLR Lens Discussion 03-01-2013, 10:56 AM  
Why not bring back the legendary glass?
Posted By rhodopsin
Replies: 110
Views: 9,637
Excellent point! :D (has Pentax/Ricoh mopped themselves into a corner? :lol:)
Forum: Pentax SLR Lens Discussion 03-01-2013, 10:36 AM  
Takumar repair
Posted By rhodopsin
Replies: 2
Views: 1,322
I've been inside from front -- simply focus close, grab front section & unscrew it.

For entering from camera side, check disassemble instructions for 135/3.5 or even 50/1.4 or 55/1.8. The disassemble is similar. Involves "chinese puzzle" moving of aperture ring. Likely, A/M switch is simply bent. Straighten ONCE, i.e. do not stress metal too much or it will break.

Caveat: Is switch really stuck or: On S-M-C Takumars there is a second tiny pin (besides the diaphragm pin) which must be depressed before A/M switch can be switched from Auto to Man.
Forum: Do-It-Yourself 03-01-2013, 10:35 AM  
Build AC adapter for the Pentax K-r or K-30
Posted By rhodopsin
Replies: 9
Views: 5,235
Nice work! Thanks for sharing!
Forum: Pentax SLR Lens Discussion 03-01-2013, 10:27 AM  
Why not bring back the legendary glass?
Posted By rhodopsin
Replies: 110
Views: 9,637
Why would Pentax reproduce legacy glass when there is so much of it available places such as here in marketplace and ebay?
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