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Forum: General Photography 10-21-2021, 06:20 PM  
Pentax Spotmeter
Posted By Derek
Replies: 4
Views: 751
What can be seen of it from this angle is identical to my 1/21. However, the 1/21 manual makes no mention of a 9v mercury cell; only a 9v regular cell and a 1.3v mercury. I've been getting occasional use of this meter by substituting an A640 (LR52) for the mercury cell.
This brings up a question that I sometimes wonder about. The Spotmatics came out in the heyday of mercury cell use, but can function well with alkalines due to the presence of "bridge circuitry". Is it possible that the Pentax spotmeters of that era share the same circuitry?
Forum: Pentax DSLR Discussion 10-14-2021, 11:53 AM  
Battery Shelf Life
Posted By Derek
Replies: 20
Views: 1,015
Thanks to everybody! I shall quit fretting about things and instead think about always having a warm spare battery this winter.
Forum: Pentax DSLR Discussion 10-14-2021, 09:55 AM  
Battery Shelf Life
Posted By Derek
Replies: 20
Views: 1,015
Hi All.

I just received a pair of Ricoh-Pentax D-Li90's from a reputable bricks-and-mortar store in western Canada. The manufacture dates are 202012 and 201811. Now there isn't likely to be a problem with the one that's about a year old, but the other one is just about three years old. I was under the impression that the life span of these batteries can be around three years, and it's possible for them to degrade while in an unused condition.

So, is this some unreasonably old stock that I should be sending back? When other people receive batteries, how old are they when they arrive? Should I be squawking at this merchant, with whom I've had decent dealings with to date?

I'm interested in your thoughts.

Derek
Forum: Pentax SLR Lens Discussion 08-21-2021, 05:19 PM  
Which 35mm F/2.0 to get?
Posted By Derek
Replies: 24
Views: 1,348
You might like the Samyang 35/1.4, if you don't mind the physical size of the lens.
Forum: Troubleshooting and Beginner Help 07-28-2021, 09:34 AM  
Problem focussing Samyang 85mm F1.4
Posted By Derek
Replies: 43
Views: 1,501
I have problems focusing my Samyang 85/1.4 with the OVF.

It's a different matter when I use Live View, Focus Peaking, and especially the Live View magnification. This doesn't mean that you must be on a tripod all the time. I bought one of those LCD focusing hoods and it works very well indeed. You can not only use LV, FP and magnification with ease, but it also gives one a firm third point of contact, ie., your eye socket. It's also useful for examining your results after. This has increased my focusing accuracy amazingly.

Another alternative is to find an F 1.7x AF converter. These work very well with manual focus lenses, and can focus them much more quickly and accurately than I can. As an older photographer I'm well accustomed to manual focusing, but digital OVF's just don't seem to cut it. I have Samyang 85 and 135 lenses, and several older K, M and A's; they all work great on K-1 II, K-3 II and KS-2 when combined with the converter.

A lot of people say that the Samyang 85/1.4 is soft when it's wide open. I'm not so sure. Like many large aperture lenses, there is some contrast loss when used wide open. Nail the focusing and add some contrast in post, and the lens will surprise you.
Forum: Pentax Film SLR Discussion 07-24-2021, 09:08 AM  
90 degree viewfinder
Posted By Derek
Replies: 8
Views: 793
Olympus made a 90 degree viewfinder for their OM series that is plentiful, cheap and high quality. I believe it fits on Pentax M-series and later.
Forum: Film Processing, Scanning, and Darkroom 04-14-2021, 07:21 PM  
Multigrade filters
Posted By Derek
Replies: 15
Views: 1,097
I find it's sometimes handy to keep a small pocket flashlight in the darkroom. I put a little disc of rubylith over the lens. It would help with your controller dials, and it's great when you drop something and it rolls under the counter.
Forum: Digital Processing, Software, and Printing 04-08-2021, 11:55 AM  
Tricks to reduce cost of ownership of inkjet printers?
Posted By Derek
Replies: 38
Views: 3,283
There's a gentleman on youtube named Jose Rodriguez who has a series of videos that address this.
In my own case, I have a Canon Pro-100 and I follow his recommendations about refilling the ink cartridges.
It saves a lot of money and it's not even that messy after the first time:).
I use Precision Color ink which is available in Canada and the USA. The only Canon ink I use is the yellow
because it doesn't blend well with the PC yellow. I understand that that will clot and make globs, etc.
The videos are worth checking out.
Forum: Pentax SLR Lens Discussion 03-31-2021, 11:05 AM  
How many extension tubes can one use - ?
Posted By Derek
Replies: 18
Views: 882
Another approach would be a cheap 49mm lens coupler from ebay. Mount your 100 on the camera and then reverse mount the 50 to that to take you to 2:1. You're using the 50 as a close-up filter, but there's not much room between you and your subject. Hand-held becomes really only possible with macro flash.
Forum: Pentax SLR Lens Discussion 03-30-2021, 06:10 PM  
How many extension tubes can one use - ?
Posted By Derek
Replies: 18
Views: 882
If you are using automatic tubes that close down the aperture when you make the shot, you'll hit a mechanical limit where the linkages cannot perform their function. You are using three tubes? You might get another one or two.
When you use too much extension you can also reach a point where the plane of focus is so close that it is now inside the lens.
Forum: Film Processing, Scanning, and Darkroom 03-07-2021, 09:06 AM  
Darkroom shelves...
Posted By Derek
Replies: 9
Views: 1,365
Something you might try is single tray developing. Get some wide mouth jars, one for each chemical. Leave the print in the tray and just pour the chemical baths in and out. It's easier and less messy than it sounds.
Forum: Troubleshooting and Beginner Help 03-01-2021, 08:01 AM  
K-1 II Stuck in movie mode.
Posted By Derek
Replies: 7
Views: 720
lol, I think my K-1's telling me to take a greater interest in large format!
Forum: Troubleshooting and Beginner Help 02-28-2021, 09:29 PM  
K-1 II Stuck in movie mode.
Posted By Derek
Replies: 7
Views: 720
Boy, is my face red.

I'd completely overlooked that dang switch. (I did mention that I never shoot video.) Everything is fine.

Thanks Adam!
Forum: Troubleshooting and Beginner Help 02-28-2021, 09:11 PM  
K-1 II Stuck in movie mode.
Posted By Derek
Replies: 7
Views: 720
Hi all,
I went to use my K1 II today and it goes directly into Movie mode and won't come out. It has been sitting for a few days, and the last time I used it I was playing about with some 30 second exposures (aperture priority) and a pinhole lens. I've changed batteries, sim cards, tried to do a reset but without any effect.
It seems to work OK in movie mode but I never use it for that, strictly stills. Oh yeah, I've had the camera for about one year and two months.
Any ideas? Am I off to the post office tomorrow?

Derek
Forum: Pentax Film SLR Discussion 12-18-2020, 03:43 PM  
Curious Pentax LX Meter Behavior
Posted By Derek
Replies: 13
Views: 832
Yes, the older shutter lock is similar in shape to the MX one. The LX is noted as being a difficult camera for a tech to repair if they don't have access to Pentax parts. There are dust/moisture seals that are not present in other bodies, but need to be replaced if an LX is disassembled.
I'm sorry to hear about your troubles. Is it feasible to work with it the way it is? I have two LX's, but the flash operation quit in the older on. I'll just have to sell it for a lower price when the time comes. They're not getting any younger, I'm afraid.
Forum: Pentax Film SLR Discussion 12-16-2020, 07:15 PM  
Curious Pentax LX Meter Behavior
Posted By Derek
Replies: 13
Views: 832
My 5278xxx has the old style shutter lock, but still meters to 3200 ASA.
Forum: Pentax SLR Lens Discussion 11-17-2020, 11:52 AM  
Pentax 300mm F4 M* and A* utilize ED glass
Posted By Derek
Replies: 33
Views: 2,173
As I stated earlier, the M* was unique in the "M" series lenses. There are no other M* lenses that I am aware of. It doesn't need much more branding than that to differentiate it as special (and more expensive) within the "M" lens line.

The A* lens line is much different, containing some lenses that contain "ED" glass and some that don't. There are some that say "ED" on them and they are also special (and more expensive). I say if an "A" series lens doesn't say "ED" on it, then logically it doesn't have any "ED" elements in it. If it did then Pentax would have been marking, and marketing, the lens as something special (and more expensive). I would surmise (not insist) that the presence of a "star" (but no "ED") could indicate the presence of low dispersion glass (but not "ED").

If you go back and read the original post it states that the A* 300/4 contains "ED" elements. This statement is what I am referring to. This is what I find is contrary to not only my own experience with the lens, but also marketing logic in general.
Forum: Pentax SLR Lens Discussion 11-17-2020, 10:45 AM  
Pentax 300mm F4 M* and A* utilize ED glass
Posted By Derek
Replies: 33
Views: 2,173
If you go back and read the original post you'll find that it only referred to the presence of "ED" glass in both the M* and the A* 300/4's. I say that this is most likely incorrect. This is what I am referring to.
Forum: Pentax SLR Lens Discussion 11-17-2020, 04:36 AM  
Pentax 300mm F4 M* and A* utilize ED glass
Posted By Derek
Replies: 33
Views: 2,173
Yeah, you can say that again.:lol:
Forum: Pentax SLR Lens Discussion 11-17-2020, 04:07 AM  
Pentax 300mm F4 M* and A* utilize ED glass
Posted By Derek
Replies: 33
Views: 2,173
Well, that's all rather ambiguous and I wouldn't put too much reliance in those title descriptions. A moments scrolling took me down the pages to the A 35-105/3.5, which the title describes as having a widest aperture of 4.0, despite the widest aperture of 1:3.5 being plainly visible engraved in the image of the lens a couple of centimeters lower. Another printing error?

Whatever. I still stand by my statement that if the A* 300/4 had some ED glass in it, Pentax would have indicated so on the lens, just as they did with each_and_every_other_"ED"_lens in the "A" series.
Forum: Pentax SLR Lens Discussion 11-16-2020, 05:38 PM  
Pentax 300mm F4 M* and A* utilize ED glass
Posted By Derek
Replies: 33
Views: 2,173
Thank-you! That's useful.
Forum: Pentax SLR Lens Discussion 11-16-2020, 02:42 PM  
Pentax 300mm F4 M* and A* utilize ED glass
Posted By Derek
Replies: 33
Views: 2,173
That download of the Dutch catalog just seems to make things murkier. The 300 M* is shown with no special glass mentioned, while the A* is marked as having ED and it's even included in the official name of the lens. However, the only images of an A* 300/4 that I can find do not show this on the barrel. Printing error?
Forum: Pentax SLR Lens Discussion 11-16-2020, 01:41 PM  
Pentax 300mm F4 M* and A* utilize ED glass
Posted By Derek
Replies: 33
Views: 2,173
Interesting. That would certainly provide some explanation, although this doesn't help with the quote from a book provided by "aslyfox".

Just curious, did that thread that you quoted from say anything about the 85/1.4 and the 135/1.8, a couple of lenses I've sometimes dreamed about? Are they also "low dispersion"? Their diagrams don't hint at anything "ED".
Forum: Pentax SLR Lens Discussion 11-16-2020, 12:48 PM  
Pentax 300mm F4 M* and A* utilize ED glass
Posted By Derek
Replies: 33
Views: 2,173
I don't know the list prices for the "A" line at that time. It could be that Pentax wanted to keep the A* 300/4 as a cheaper and lighter alternative to the large and expensive 300/2.8. Perhaps they were hoping to push buyers toward the more expensive lens.

In this case I would have preferred them to sell a smaller but higher quality 300/4, complete with "ED".

---------- Post added 11-16-2020 at 11:59 AM ----------




Oops! I missed your second point.

As far as I know, the M* 300 was the the first lens that Pentax used "ED" glass in. There was no large number of of concurrent lenses that needed to be differentiated according to the materials used, and the price charged.
Forum: Pentax SLR Lens Discussion 11-16-2020, 10:40 AM  
Pentax 300mm F4 M* and A* utilize ED glass
Posted By Derek
Replies: 33
Views: 2,173
It has always been assumed that the 300/4 M* and the 300/4 A* are optically identical, but what if they're not? The lens formulae appear identical, except that some diagrams of the M* indicate ED glass, whereas the ones I've seen for the A* don't show that. If anyone has seen diagrams for the A* that show "ED" material being present in the lens, please correct me. I suspect that the higher priced glass was omitted in the 300/4 although the elements were ground to the same shapes.

In the mid-80's Pentax brought out their wonderful "A" lenses and many of the longer ones in include "ED", not just in the lens diagrams, but also in the name engraved upon the lens. The A* 300/4 seems different. It's more in keeping with the excellent 85/1.4 and the 135/1.8 of the same production era. The 85 and the 135 are certainly not shabby company to be lumped in with, but it seems odd from a marketing point of view that Pentax wouldn't mention the presence of "ED" elements.

This could explain the preference that many owners apparently have for the M*. It would also explain my own experience with the A* 300/4.

In my film-and-darkroom days I found that the A* 300/4 was a handy little lens and a pleasure to use, but my own sample, while it seemed fine for 8x10 enlargements, wasn't providing enough resolution for 16x20's. I decided it wasn't quite what I was looking for and sold it to a PF list member who seemed pleased with it. It has since been replaced by a Tamron 60B, an A* 200/2.8 and an F* 300/4.5, any of which can give more useful results. Note that both of these Pentax's contain "ED", not just in the the diagrams, but also in the engravings on the lens bodies.

I wonder if the presence of special glass was deemed more necessary in the longer focal lengths, but less so in the shorter, with an eminently portable 300/4 being used as the cut-off point.

This is all just a matter that I've idly mused about in the past. Again, if anyone has evidence to the contrary, please chime in. It would be interesting to try out the M*, but the presence that F* 300/4.5 in my lens line kind of precludes that.
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