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Forum: Pentax DSLR Discussion 11-15-2020, 07:59 AM  
Have Pentax IBIS capabilities improved with successive generations?
Posted By vonBaloney
Replies: 38
Views: 2,204
Oh, I see, I thought you were saying the opposite, but you were saying IBIS *must* improve just to keep the same performance as the pixel density goes up.
Forum: Pentax DSLR Discussion 11-14-2020, 11:55 AM  
Have Pentax IBIS capabilities improved with successive generations?
Posted By vonBaloney
Replies: 38
Views: 2,204
Pixel shift or IBIS? IBIS would have to get better with more pixels on the same size sensor, right?
Forum: Pentax SLR Lens Discussion 11-09-2020, 09:46 AM  
experiences with Soligor 400 mm f/6.3?
Posted By vonBaloney
Replies: 18
Views: 697
Yeah, there are a ton of versions (branded names) of that lens, and a ton more that are very similar (different construction, but nearly the same). Simple construction. It obviously isn't going to compare to any high-end telephoto (even a vintage one), but it isn't abjectly terrible either. I wouldn't pay much for it at all -- there are a gazillion of them out there. The interesting thing about it (and other cheap old lenses) is that it is actually sharper using it on modern digital (sort of) than it was originally because with a click of a button in lightroom much of its noticeable spherical aberration can be instantly corrected and so the sweet spot is somewhat enlarged (will still look best in the center though). It is something to play with -- not for serious work though.
Forum: Pentax DSLR Discussion 10-02-2020, 08:49 AM  
Have Pentax IBIS capabilities improved with successive generations?
Posted By vonBaloney
Replies: 38
Views: 2,204
I've only used Topaz. Sometimes it is excellent, sometimes it doesn't work out. In any case, the technology is definitely improving and deep learning has made major strides in the last few years in general.
Forum: Pentax DSLR Discussion 10-02-2020, 07:43 AM  
Have Pentax IBIS capabilities improved with successive generations?
Posted By vonBaloney
Replies: 38
Views: 2,204
I didn't say it was a buzzword. But neural networks are software. i.e. you can clean up shaky images after the fact much better than a few years ago with neural networks (among other things that the camera could also do like saving the SR sensor data for later processing). So I'm saying software will continue to allow improvement in shake reduction even beyond a hardware limit that might be imposed by the rotation of the earth or whatever.
Forum: Pentax DSLR Discussion 10-01-2020, 07:56 PM  
Have Pentax IBIS capabilities improved with successive generations?
Posted By vonBaloney
Replies: 38
Views: 2,204
That's ok, recent improvements in neural networks (i.e. software) will pick up the slack.
Forum: Pentax DSLR Discussion 10-01-2020, 05:20 PM  
Have Pentax IBIS capabilities improved with successive generations?
Posted By vonBaloney
Replies: 38
Views: 2,204
The KP is unquestionably better than the K-5 in this regard.
Forum: Pentax DSLR Discussion 10-01-2020, 12:49 PM  
Have Pentax IBIS capabilities improved with successive generations?
Posted By vonBaloney
Replies: 38
Views: 2,204
Yes, definitely.
Forum: Lens Clubs 09-15-2020, 08:35 AM  
Adaptall Mount Club (Tamron).
Posted By vonBaloney
Replies: 4,101
Views: 719,872
Yeah, basically did the same but with a much longer plate -- makes balance much easier.
Forum: Lens Clubs 09-15-2020, 07:18 AM  
Adaptall Mount Club (Tamron).
Posted By vonBaloney
Replies: 4,101
Views: 719,872
When I had one I used a very long plate with a little brace on the part between the two rings (the one bit that doesn't move). The brace helped a lot.
Forum: Pentax Q 08-05-2020, 07:59 PM  
Now you can order a Metabones K to Q Speedbooster!
Posted By vonBaloney
Replies: 108
Views: 6,733
Ok, to be clear the metabones device for Pentax K to Q (that doesn't exist) is in-fact a focal reducer -- same thing as a "telecompressor" I guess. But it shouldn't vignette as I noted because these are lenses for a bigger format -- that's the whole thing that allows it to work.
Forum: Pentax Q 08-05-2020, 06:45 PM  
Now you can order a Metabones K to Q Speedbooster!
Posted By vonBaloney
Replies: 108
Views: 6,733
Oh, *that* adapter, not *this* adapter...ok.
Forum: Pentax Q 08-05-2020, 06:15 PM  
Now you can order a Metabones K to Q Speedbooster!
Posted By vonBaloney
Replies: 108
Views: 6,733
Isn't it though? It's a focal reducer -- that's the way it gets it "speed boost", right? And you won't get vignetting because they are K lenses using the tiny Q sensor so there is plenty of leeway there.
Forum: Pentax Q 07-12-2020, 05:03 PM  
Now you can order a Metabones K to Q Speedbooster!
Posted By vonBaloney
Replies: 108
Views: 6,733
Don't we spend more on lenses than cameras? Doesn't the metabones allow us to use all those lenses? It is a bargain for some...
Forum: Pentax Q 06-10-2020, 08:25 PM  
Now you can order a Metabones K to Q Speedbooster!
Posted By vonBaloney
Replies: 108
Views: 6,733
Would not trust this listing.
Forum: Pentax Q 05-15-2020, 11:06 AM  
Q used prices
Posted By vonBaloney
Replies: 6
Views: 1,072
I did buy an extra one when I had the chance...
Forum: Pentax SLR Lens Discussion 03-17-2020, 06:45 AM  
Preventing M42 adapter light leaks and dust ingress - an easy solution!
Posted By vonBaloney
Replies: 40
Views: 12,558
Good lenses. I think my solution for those is above in this thread somewhere (which only involves popping on a big rubber washer).
Forum: General Photography 03-08-2020, 10:35 AM  
Corona virus prevention on cameras and lenses
Posted By vonBaloney
Replies: 211
Views: 10,093
Forum: General Photography 03-08-2020, 09:07 AM  
Corona virus prevention on cameras and lenses
Posted By vonBaloney
Replies: 211
Views: 10,093
Yes, medical error deaths get funneled into the things they "actually" die of, i.e. doctor causes heart attack: they died of "heart disease" on the death cert. And so heart disease stats are inflated, which affects flows of research money. It's a huge problem.
Forum: Pentax KP 03-07-2020, 03:08 PM  
Vintage lenses fouling KP mirror
Posted By vonBaloney
Replies: 21
Views: 1,383
I have a tele-xenar 135/3.5 -- it doesn't protrude much, can't imagine it being a problem. Will have to test that one. One thing about m42s is that they are sometimes used-adjusted to change infinity settings when people adapt them to things they don't adapt well too -- is it possible to adjust a lens so it protrudes farther than it once did?
Forum: Pentax KP 03-06-2020, 05:23 PM  
Vintage lenses fouling KP mirror
Posted By vonBaloney
Replies: 21
Views: 1,383
The K-01 has a low overhang where the mirror would flip-up/focusing screen area would be, and the DX/1.7 just crushes into that if you start focusing toward infinity (assuming it was away from infinity when you mounted it) and so you could do some real damage that way...
Forum: General Photography 03-06-2020, 05:08 PM  
Corona virus prevention on cameras and lenses
Posted By vonBaloney
Replies: 211
Views: 10,093
Because they don't think they'll be able (or will be afraid) to go to the grocery store at all soon, so they need everything. And they might be right...
Forum: Pentax KP 03-06-2020, 04:02 PM  
Vintage lenses fouling KP mirror
Posted By vonBaloney
Replies: 21
Views: 1,383
It doesn't work on the K-01, that's what I remember. I can try it again just to make sure I'm not making things up.

The Mamiyas some of them you have to file down the aperture ring to mount it, but I haven't any infinity mirror-fouling problems. But I haven't used them much -- my copies had tended to have Schneideritis and have a hotspot when stopped down.
Forum: Pentax KP 03-06-2020, 03:38 PM  
Vintage lenses fouling KP mirror
Posted By vonBaloney
Replies: 21
Views: 1,383
The SX, meaning the Mayima? From what I remember, the Yashinon-DX 50/1.7 is the absolute worst lens ever as far as hitting mirrors -- even the DX/1.4 I think is ok (don't quote me on that). And probably the others you mention unless you've found out differently. (And I've got copies of all of those, don't think I've had that particular trouble with any of them.) There are are couple of others known for hitting mirrors on full-frame that I can't recall right now, but I don't think they were all in the same family or even necessarily adaptable to Pentax (Canon lenses, etc). As far as APS-C, the Yash DX/1.7 is the only one that comes to mind.

BTW, the later Yash DS-M 1.4 & 1.7 50s are totally fine in that regard and even better optically, although not as cool-looking...
Forum: Pentax KP 03-06-2020, 03:30 PM  
Vintage lenses fouling KP mirror
Posted By vonBaloney
Replies: 21
Views: 1,383
Now that I think about it I think my memory is failing me whether I actually had trouble with it or not. (Not eager to go test that) However, that lens is definitely a problem with full-frame cameras besides the original one it was meant for -- I believe later model Yashinon film bodies even had a warning about using it. I think what it was is that some people were having trouble with it on Pentax APS-C bodies (at infinity) and some weren't. Probably specific to your copy of the lens. And I do recall thinking "Ok, well it should be fine on my K-01 with no mirror" and then finding out it wasn't because the "mirror box" wasn't big enough and it would just bang into the edge. So maybe the issue is not only that it protrudes quite far, but also that the part that is protruding is of usually wide diameter?
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