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Forum: General Photography 08-18-2020, 12:56 PM  
" has expired" ?
Posted By rhodopsin
Replies: 27
Views: 2,008
Thanks for topic. Attila email bounces. Emailed Klaus. Not reply yet.
Forum: Troubleshooting and Beginner Help 07-12-2020, 01:09 PM  
K3-II producing purple images
Posted By rhodopsin
Replies: 17
Views: 1,291
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: Site Suggestions and Help 07-30-2011, 05:04 AM  
Suggestion Place to post scans of camera and lens manuals
Posted By rhodopsin
Replies: 11
Views: 2,008
Note manuals while free to download, include a request for a donation "if you find the manual useful" Mr Butkus has done a lot of work to get them posted online...

There are some vintage ads & sales brochures (incluing a manual for YS Mounts) here
Forum: Pentax SLR Lens Discussion 12-24-2009, 11:35 AM  
Snappy, oil and brassing???
Posted By rhodopsin
Replies: 28
Views: 7,798
except for the fact in this thread we are discussing a 40-year-old lens :)
Forum: Pentax Camera and Field Accessories 11-24-2010, 09:04 PM  
UV filters necessary?
Posted By rhodopsin
Replies: 18
Views: 5,389
Use a hood instead of filter for protection.

UV filters DO help with excessive UV at high altitudes. Next time you are there, watch the exposure meter change when UV filter is added or removed.

UV filters DO reduce atmospheric haze in some situations, such as long-distance telephoto -- the 'haze' in this case is invisible to the eye, but shows on film and in images, i.e. film and sensor are sensitive to UV, showing atmospheric haze the eye does not see.
Forum: Troubleshooting and Beginner Help 08-17-2011, 01:37 AM  
Sensor or lens dust?
Posted By rhodopsin
Replies: 30
Views: 4,663
In my experience blowers remove the dirt an dust permanently. I had heck of time with used camera getting sensor and chamber cleared of dust, but once I did, both have remained clear and free of dust using only occasional blowing, for the past three years. No wet cleaning necessary. And I change lenses frequently, often in dusty conditions (outdoors).
Forum: Pentax Medium Format 07-08-2011, 07:18 PM  
645D vs Nikon D3x, What should we test?
Posted By rhodopsin
Replies: 76
Views: 17,270
?! huh?

Tongue firmly in cheek (I hope Adam doesn't mind some fun at his expense!):

"I'm delighted to be in possession of both the Pentax 6x7 as well as the Pentax Spotmatic II this week, and we'll soon be conducting an in-depth comparison between the two..."

or perhaps:

"I'm delighted to be in possession of both the Canon 5Dc (FF) as well as the Canon XT/350D (APS-C) this week, and we'll soon be conducting an in-depth comparison between the two..."

Comparing a FF 24x36 camera with a medium format camera?

Okay, "focus on pro features - and which is better for what purposes", I'm guessing this is a features-only comparison?
Forum: Pentax SLR Lens Discussion 06-11-2011, 11:47 AM  
Prime Lens Owners - How often you use your zooms?
Posted By rhodopsin
Replies: 75
Views: 8,040
What is a zoom lens? Are they any good? At what?
Forum: Pentax SLR Lens Discussion 05-14-2011, 09:37 AM  
Lens "defect"?
Posted By rhodopsin
Replies: 20
Views: 3,645
Let us see it?

edit: :o images load slow on dialup!

Could be oil fraction mist deposit from helicoid grease over heating...any on diaphragm blades? experienced person should be able to clean easy, key word "experienced" -- this is a valuable lens, worthy of professional restoration. Or, just use it -- any visible effect is very unlikely, even for pixel peepers!
Forum: Pentax SLR Lens Discussion 03-26-2011, 04:33 PM  
Is a full frame lens on an aps-c, a negative?
Posted By rhodopsin
Replies: 36
Views: 11,493
"Is a full frame lens on an aps-c, a negative?"

Generally, since the aps-c sensor only sees the central portion of the image circle, performance is better. Due to the smaller physical size of aps-c sensor, diffraction effects will be seen at smaller f/# than on full frame.

A negative? Yes, imho, because I have FF digital body (5Dc) and film cameras (Spotmatics, of course!) :lol: I will probably get flamed for this: aps-c cameras are mere toys compared to FF! :) No flame please unless you have FF body!
Forum: Pentax SLR Lens Discussion 03-06-2011, 07:15 AM  
Basic Lenses Repair, Maintenance & Cleaning Kit
Posted By rhodopsin
Replies: 30
Views: 18,590 has lens tools...I've also seen kits on the 'baY.

well-lit work area

non-powdered surgical gloves or finger tips

tray such as cookie baking sheet, with soft pad covering bottom -- pad prevents dropping parts from bouncing, sides of tray keep parts from rolling off)

small cups/dishes for holding parts & soaking parts in cleaner

screwdrivers & knife-sharpening stone to grind tips to exact screw-fit -- cheap $1-2 sets work great, or get a Wiha set that lasts lifetime -- for slotted, cross-tip, phillips screws, and miniature hex set.

lens spanner (purhase, homemade, substitute old calipers or compass or pliers with re-ground tips)

lens ring removal tools (purchase, use correct size old washtub stopper or foot from crutches, or a dental dam & fingers)

lighter fluid for cleaning lens body and stubborn lens deposits

castile soap for cleaning lens body and stubborn lens deposits


Eclipse (or reagent grade methanol) Lens Cleaning fluid

Pec-pads (clean-room grade microfiber cloths)

optional: lens suction cups, used to pick up & position lens elements

helical grease

touch-up paint

Basic techniques to repair lenses (and cameras)::Manual Focus Lenses
Forum: Pentax SLR Lens Discussion 11-25-2010, 08:39 AM  
A matter of math
Posted By rhodopsin
Replies: 13
Views: 2,411
Excellent point. Bravo bdery!
Forum: Pentax SLR Lens Discussion 11-18-2010, 08:18 AM  
Info needed on CUNOR lens
Posted By rhodopsin
Replies: 6
Views: 4,867
Tokina-made. Yes, the no-infinity problem is due to the added thickness of ~46-42mm adapter.


the many brand names: Manual Focus Lenses :: View topic - Lentar (Tokina?) 200/4.5 preset - another lens of many names

adapter info: Manual Focus Lenses :: View topic - Tele Tokina 4.5/200mm Tokyo Koki
Forum: Pentax SLR Lens Discussion 09-18-2010, 09:28 PM  
I got LBA
Posted By rhodopsin
Replies: 25
Views: 3,975
Let's good was the deal greatly depends on condition, and which versions are those lenses.

A clean Spotmatic in good shape -- meter works, shutter speeds reasonably accurate, light seals and mirror bumper are inexpensive and easy to replace -- goes for $25-$35, up to $50 for 'mint' tested good condition.

The Super 3.5/135 depends on version. Version 1, serial number begins with '1', with mark-free clean optics and snappy clean diaphragm is worth $60-75. Later version only $30-$40.

The 3.5/28 Super with optics & diaphragm in great condition, $40.

The TC not much, a few dollars.

The 13mm cine lens is probably usable reversed as macro lens, not worth much. No use for the 1.5". Maybe $20 for both. I'm not sure if these might be more valuable to m4/3 crowd.

Don't know about the flash. Does it work? I don't see a flash head. (edit: I see the head now)

The Opticam maybe $10.

Add it up...
Forum: Pentax SLR Lens Discussion 09-04-2010, 02:38 AM  
takumar 135mm f2.5 or 3.5? LBA
Posted By rhodopsin
Replies: 21
Views: 7,942
Correct and right!

The M42 Super-Multi-Coated TAKUMAR 135mm f2.5 and M42 Super-Multi-Coated TAKUMAR 135mm f3.5 are designed for different purposes. The 2.5 has softer focus and slightly less contrast wide open, excellent for portraits, whereas the Super-Multi-Coated TAKUMAR 135mm f3.5 is sharp and high contrast from wide open.

The M42 Super-Multi-Coated TAKUMAR 135mm f2.5 version I has different optical formula than version II, not as sharp. Opinions vary which is better, imho due to personal taste and usage.

There are different versions of Super-TAKUMAR 135mm f3.5, with different optical formulas and rendering qualities. Personally I like the early version best, those with serial numbers beginning with '1'.

Which is to say that all the Takumar versions are great, except the entire later bayonet non-SMC 'Takumar' line which imho was the idea of greedy marketing attempt to capitalize on excellent reputation of earlier M42 Super, S-M-C, and bayonet SMC Takumars.

PS I have all these lenses (serious LBA :D), however my photo examples pale considerably compared to others. There are plenty of excellent examples online already.
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