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Forum: Pentax SLR Lens Discussion 3 Days Ago  
What's a good long-range lens for a Pentax K100D Super?
Posted By marcusBMG
Replies: 17
Views: 601
+ 1 for the 55-300, you will struggle to find a sigma/tamron/other equivalent thats as good.

Having a go with manual focus is worth considering because of the minimal outlay but you don't have live view - an important complement to focus through the OVF IMO. So that makes eg the 500mm mirrors more problematical for a start - tough to focus by eye at f8 though its fun to try and with practice you do get more keepers. The tokina made 400mm f6.3's are probably the best bet for a good birds field of view. For more general tp the tamron adaptamatic/adaptall 300 f5.6's are all pretty good and cover an absence in the pentax K mount legacy line up - no 300mm f5.6. With a PKA mount on one of the adaptalls you have an "A" lens.
Check out the 300mm lens club for images with a variety of lenses, esp my posts for the vintage lenses.
Forum: Lens Clubs 3 Days Ago  
The 300mm plus lens Club discuss your long lenses.
Posted By marcusBMG
Replies: 29,839
Views: 2,627,363
That's a nice 60B, mines a bit of a "beater".
The 43mm filter screws into a holder that fits in a slot. You can see the holder in your 2nd pic, it has tamron ∅43 on it. I don't really notice any difference with or without. One filter I have been meaning to try out more is a 43mm polariser.
The large bayonet hood is protection enough for the front in use. I don't have a front filter. If you really want one then yeah the best you can get, but at 112mm that will have an ouch price tag.
Forum: Lens Clubs 5 Days Ago  
The 300mm plus lens Club discuss your long lenses.
Posted By marcusBMG
Replies: 29,839
Views: 2,627,363
Soligor 350mm f5.6's come in tokina and tamron made incarnations as well but these 9xxxx serials with the "chrome ears" on the aperture ring are the most common. I acquired one of these about 3 years ago and wasn't impressed. However I have now picked up another one and this one is much better, very much in the right ballpark IQ-wise for one of these t-mount preset lenses.

These are my standard test pics of one of the castle turrets. Samsung NX20, f5.6, f8, f11.







However I would still rate the tamron made 350mm best. Between the tokina made 350mm and this one I think the tokina edges it on IQ but this one has the advantage re focusing closer. This lens might be a preferred choice over it's sibling the chrome eared 400mm f6.3, also because of its closer focusing capability - ~ 4m as opposed to 6m.
Forum: Pentax SLR Lens Discussion 09-10-2018, 07:14 AM  
Hanimex 300mm
Posted By marcusBMG
Replies: 4
Views: 363
By 47mm mount I assume you mean the "faux" t-mount that has a 47mm thread to mount the camera mount ring (= t-ring) rather than a 42mm thread. (pic here). For me that mount is definitively tokina - it's only seen on Tokyo koki and rebranded tokyo koki (=tokina) lenses from the 1960's.

In that case that's an interesting, even historic, and I would guess rare early tokina made mirror from that era.

There's a thread on mflenses discussing mainly the later Chinon/ohnar/makinon mirrors.
Your lens is listed on M42lens.com .
Forum: General Photography 08-27-2018, 08:09 AM  
How fast is your PC - and should I upgrade mine now Ihave a K3-ii?
Posted By marcusBMG
Replies: 29
Views: 1,186
Reviving this thread.

So I should have posted some results with the i7 box ages ago sorry. But fact is I got distracted by endless other things and the box has been sat neglected in the conservatory. Duh! I need to psyche up for the hassle of the swap....

Anyway in the meantime I have had to do other pc jobs, including a clean up and win install on the ol'mans pc - he got seduced by a phone conman posing as BT outreach, no damage done thanks to the bank querying a transfer to Malaysia ! but we presumed PC was compromised so reformat and clean install. At the same time I installed a 771 xeon (see here) instead of the core-2 quad and since that worked well I picked up two HP sff boxes for upgrade from core-2 duo, to go on ebay if my niece doesn't want one for college.
Any way out of curiosity I repeated dng convert tests.
- xeon X5450, 8gb ram 1TB drive, win 7, HP 3120 sff box: < 10secs for convert 22 files
- repeat test on my core-2 quad box, 8 gb ram, 1tb drive, win 7: 1min 6 secs approx.

Now the 3 GHz xeon is on benchmark maybe a third faster than the 2.4GHz (running at 2.66GHz) Q6600 in the other box so no surprise that its faster, but almost 10x faster??? this has really piqued my interest now. Just why might my core-2 quad box be so slow?? any suggestions?
Forum: Lens Clubs 08-24-2018, 06:36 AM  
The Mirror Lens Club!
Posted By marcusBMG
Replies: 962
Views: 360,289
I was surprised to see the rubinar wasn't listed GUB, so I listed it that's my lens in the pics. It's a nice one actually, with original case, filters etc. and cyrillic user manual/certificate.

The DoF calculations merely emphasise the tightness of the focus. The practical issue is seeing it, which IME I can't do well enough in my OVF's, only by using magnification in an EVF or on screen, and then millimetrically tickling the focus to try to nail it.
It just isn't easy with mirrors.
The rubinar for some reason is particularly ticklish, I find I'm to-ing and fro-ing a lot, and end up trying to land on a middle position (I wonder if there's a bit of slack in the helicoid - check - yes I think there is). The tamron is significantly better - more clear cut oof-in-oof as I move the focus.
Forum: Lens Clubs 08-23-2018, 06:36 AM  
The Mirror Lens Club!
Posted By marcusBMG
Replies: 962
Views: 360,289
No, the korean made samyangs have no connection to the Russian made Rubinar. The Russian/old soviet mirrors have a pretty good rap.

I hope you don't mind too much my remarking that your results with the Q are what I would have expected with that lens - ugh.

I just did a bit of a browse in the adapted lenses to Q thread , there are a number of contributuions with some mirrors, most showing up that mirrors generally IME won't stand up to that pixel density very well. I know I've seen some better than expected images with the tamron 500mm however, posted by pacer IIRC, but can't find them.




+1 !!!! I would think focus is 95% of the challenge with the 1000mm f10 (and probably thats T16'ish). Do you use live view?

Further usage of the rubinar reinforces my impression I don't think it's a very good one. Not bad but...well I'll post the comparison pics against the tamron in due course.
Forum: Lens Clubs 08-22-2018, 03:16 PM  
The Mirror Lens Club!
Posted By marcusBMG
Replies: 962
Views: 360,289
What do you think made the difference?
Forum: Lens Clubs 08-21-2018, 03:15 PM  
The Mirror Lens Club!
Posted By marcusBMG
Replies: 962
Views: 360,289
Godwits, snipe and wagtails provided the opportunity to test drive a recently acquired Rubinar 500mm f8 mirror.



I habitually use my NX20 with mirrors, the facility to magnify the viewing image 5x or 7x in the evf is my best opprtunity to get the focus. F8 (actually T10'ish) by eye through an OVF proves to be just too hit and miss with the emphasis on miss - at least for me. These were taken using a bean bag. The godwit pics were at waters edge and backlit by the reflection off the water - mirrors just don't like any sort of unfavourable light like that IME - and didn't turn out very well. It was actually the images of the frustratingly skittish wagtails that came out best, due to being closest. Mirror lenses just aren't as sharp as refractive lenses so being able to resize more makes the difference. All big crops in any case except #1.
The castle from the bird reserve. I find mirrors struggle to preserve detail in these circumstances - see crop.



1:1 pixel peep crop.


At the RSPB:


Forum: Lens Clubs 08-21-2018, 03:05 PM  
The 300mm plus lens Club discuss your long lenses.
Posted By marcusBMG
Replies: 29,839
Views: 2,627,363
Also in mirror club..

Godwits, snipe and wagtails provided the opportunity to test drive a recently acquired Rubinar 500mm f8 mirror.



I habitually use my NX20 with mirrors, the facility to magnify the viewing image 5x or 7x in the evf is my best opprtunity to get the focus. F8 (actually T10'ish) by eye through an OVF proves to be just too hit and miss with the emphasis on miss - at least for me. These were taken using a bean bag. The godwit pics were at waters edge and backlit by the reflection off the water - mirrors just don't like any sort of unfavourable light like that IME - and didn't turn out very well. It was actually the images of the frustratingly skittish wagtails that came out best, due to being closest. Mirror lenses just aren't as sharp as refractive lenses so being able to resize more makes the difference. All big crops in any case.









Pretty good, not dissimilar to my tamrons, I shall try to make more of a comparison.

---------- Post added 21st Aug 2018 at 23:07 ----------



Good work with the tokina mirror in that sort of light...
Forum: Lens Clubs 08-20-2018, 07:53 AM  
The 300mm plus lens Club discuss your long lenses.
Posted By marcusBMG
Replies: 29,839
Views: 2,627,363
Which tokina is that Tigs - the SD autofocus?
Forum: Pentax SLR Lens Discussion 08-12-2018, 06:40 AM  
Is this a joke? Has anyone tried this 500mm?
Posted By marcusBMG
Replies: 10
Views: 1,178
+ tends to be better than the cheap 500mm mirrors
- that's saying very little!!

see my review on the page Adam linked...
Forum: Photographic Equipment for Sale 08-10-2018, 02:29 PM  
For Sale: Tamron 02F eyepiece; Sigma 18-125mm; PKA ext tubes; 1.4x TC's; Adaptall PKA mnt
Posted By marcusBMG
Replies: 4
Views: 1,034
adaptall pka mount $59 inc air mail post - take advantage of $- exchange rate.
Forum: Visitors' Center 08-07-2018, 07:16 AM  
Vivitar manual lens cleaning
Posted By marcusBMG
Replies: 6
Views: 379
No not without wrecking it - these are threaded.

There may be thread locker - drip a little nail varnish remover around the edge and try again.
Forum: Photographic Equipment for Sale 08-03-2018, 07:04 AM  
For Sale: Tamron 02F eyepiece; Sigma 18-125mm; PKA ext tubes; 1.4x TC's; Adaptall PKA mnt
Posted By marcusBMG
Replies: 4
Views: 1,034
prices reduced!!
Forum: Lens Clubs 08-02-2018, 11:55 AM  
Manual Zoom Club
Posted By marcusBMG
Replies: 694
Views: 54,707
Vivitar close focus 100-200mm f4. These two at f8, 2nd is heavy crop.

100mm



200mm

See vivitar lens club for a set.
Forum: Lens Clubs 08-02-2018, 10:17 AM  
Vivitar Lens Club - share the beauty
Posted By marcusBMG
Replies: 787
Views: 145,891
The komine made vivitar 100-200mm f4 close focus - a "sleeper" lens. A worthy accompaniment to its much better known stable mates the 70-210mm and 28-90mm. See for yourself. All K3, PP from RAW.



Stonechat. Big crop, f8, 200mm. Lack of fringing notable.


100mm f8



ditto


1:1 pixel peep crop:


f4.


f8


f8


200mm f8


1:1 pixel peep crop. Prime = resolution.


I already rate this one of the very best zooms from the era - late 1970's?
Forum: Visitors' Center 07-31-2018, 06:03 AM  
Vivitar manual lens cleaning
Posted By marcusBMG
Replies: 6
Views: 379
In extremis drill a couple of holes for the needle ends of a lens spanner
Forum: Troubleshooting and Beginner Help 07-31-2018, 05:16 AM  
Rubber grip has become loose. how to fix?
Posted By marcusBMG
Replies: 15
Views: 592
1. pick up a junk lens with a serviceable rubber grip and use that

2. cut the rubber and remove a strip to eliminate the slack. Use a piece of strong paper eg parcel wrap ~1" wide as backing under the cut. Glue the edges onto the paper and together with shoe repair like shoe goo, freesole etc (actually the stickiest glue I have found for this sort of rubber - specifically lens hoods - is called shoe glu its made in USA comes in a yellow tube, marketed in UK by Gluelines ltd).
Forum: Troubleshooting and Beginner Help 07-31-2018, 05:15 AM  
Rubber grip has become loose. how to fix?
Posted By marcusBMG
Replies: 15
Views: 592
1. pick up a junk lens with a serviceable rubber grip and use that

2. cut the rubber and remove a strip to eliminate the slack. Use a piece of strong paper eg parcel wrap ~1" wide as backing under the cut. Glue the edges onto the paper and together with shoe repair like shoe goo, freesole etc (actually the stickiest glue I have found for this sort of rubber - specifically lens hoods - is called shoe glu its made in USA comes in a yellow tube, marketed in UK by Gluelines ltd).
Forum: Visitors' Center 07-30-2018, 03:11 PM  
Vivitar manual lens cleaning
Posted By marcusBMG
Replies: 6
Views: 379
I assume you mean the nameplate. If it doesn't have little slots or holes for a lens spanner then you use friction. A correct sized rubber bung is standard. However I use a piece of plastic pipe of appropriate diameter (actually any cylindrical object of the right diameter would work eg pill container...), round the edges of one end and put on some double sided sticky tape to provide grip.
Forum: Photographic Equipment for Sale 07-28-2018, 08:41 AM  
For Sale: Tamron 02F eyepiece; Sigma 18-125mm; PKA ext tubes; 1.4x TC's; Adaptall PKA mnt
Posted By marcusBMG
Replies: 4
Views: 1,034
UPDATE:now seling RARE tamron adaptall 02F eyepiece adapter - turn your adaptall lens into a spotting scope.
Forum: Pentax SLR Lens Discussion 07-21-2018, 02:00 PM  
Mount K/ar compatibility
Posted By marcusBMG
Replies: 3
Views: 401
Nope. K-AR = Konica. Pentax mount id's would be PK, PKA or PK/AR.
Forum: Troubleshooting and Beginner Help 07-18-2018, 10:35 AM  
What settings for 600mm on K100D?
Posted By marcusBMG
Replies: 7
Views: 575
Since this lens doesn't have an iris and is therefore always "wide open", just use Av mode - no need to green button or anything. Just chimp a pic or two to get the exposure compensation you will probably need.

600mm is a long telephoto, the challenge with lenses this long is:
1. nailing focus, note that focusing by eye on a standard focus screen with no aids at f8 (actually more like T10) is next to hopeless. And your model pentax doesn't have live view? Lean on focus confirm and try some judicious focus bracketing. Practice will improve results as you get a sense of what good focus looks like and how results relate to the focus confirm signals. Good luck.....

2. reducing shake and movement. Shutter speeds 1/1000 + for any sort of hand holding - up the asa. Better to use tripods/support etc. I never leave home without my bean bag with a lens like this, and a remote shutter release.
Forum: Lens Clubs 07-18-2018, 07:02 AM  
DSLR fun with 28mm: Club for any 28mm lens
Posted By marcusBMG
Replies: 780
Views: 110,855
Good - try playing with the colour sliders I hope you don't mind my having a go - I upped yellow (brought out the ground) and lowered blue, just on your uploaded jpg.
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