Search found 249 matches

by dickb
Wed Jul 15, 2020 1:22 pm
Forum: Equipment Discussions
Topic: Nisi 77mm close up lens - first light and comments
Replies: 2
Views: 182

Re: Nisi 77mm close up lens - first light and comments

Glad to see it works well for you. In some circumstances shooting handheld with heavier macro lenses I prefer using the rear screen over the viewfinder, as that allows for a more tucked, less strenuous hold. Perhaps that may work for this combination as well.
by dickb
Thu Jul 09, 2020 2:00 pm
Forum: Equipment Discussions
Topic: Any experiences with the Nisi 77mm close-up filter?
Replies: 9
Views: 437

Re: Any experiences with the Nisi 77mm close-up filter?

Thanks for your comments, everyone. Some useful and interesting info. just a couple of points to followup, if that's OK... I'm aware of the marketing-led mark-ups. Few moan louder than I do about it - and the cost of our kit in the UK in general. But - it ain't expensive if you can't get it cheaper...
by dickb
Wed Jul 08, 2020 2:25 pm
Forum: Equipment Discussions
Topic: Any experiences with the Nisi 77mm close-up filter?
Replies: 9
Views: 437

Re: Any experiences with the Nisi 77mm close-up filter?

I don't have any experience with this specific close up lens (not filter). One thing I really don't like about it is its marketing, they make dubious claims like "Close-Up Macro NiSi lens: unique on the market. Close-up lenses on the market hardly use optical glass, let alone precision glass which i...
by dickb
Mon Jun 08, 2020 1:39 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Optics to cover 8mm 4.6X NA>0.1
Replies: 4
Views: 491

In the previous thread a 64.2 mm sensor width was mentioned, that is an important consideration when recommending lenses, as most of us will be using smaller sensor sizes. Good point, my camera has 12480 pixels * 5 microns = 64.2 mm. But the primary goal is to project 8 mm area, so only 40 mm at se...
by dickb
Mon Jun 08, 2020 12:06 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Optics to cover 8mm 4.6X NA>0.1
Replies: 4
Views: 491

In the previous thread a 64.2 mm sensor width was mentioned, that is an important consideration when recommending lenses, as most of us will be using smaller sensor sizes. There are off-the-shelf solutions that will satisfy at least some of your criteria, line scan lenses such as the Nikon Rayfact 3...
by dickb
Sat May 30, 2020 2:25 pm
Forum: Equipment Discussions
Topic: Test wafer distribution: Many features, includes res chart
Replies: 65
Views: 3976

Macro_Cosmos wrote:One left, last one!
Surely we can get one more person on the list? ;)

Shipping -- I'll be buying the envelopes soon.
OK, I'll have one as well if you haven't promised it to someone else.
by dickb
Tue May 26, 2020 1:35 am
Forum: Equipment Discussions
Topic: Etendue Mejiro lenses on eBay now
Replies: 41
Views: 2816

One workaround may be getting another makro iris lens and using the front part, V mount to filter thread as a connector, assuming its internal space is wide enough to accomodate the Etendue's lens group. I see a us$100 componon-s 80/4 or better yet a the same lens with connectors, unifoc and random ...
by dickb
Mon May 25, 2020 1:10 pm
Forum: Equipment Discussions
Topic: Speedbooster or other focal reducer for macrophotography
Replies: 5
Views: 532

Speedbooster or other focal reducer for macrophotography

Has anyone used focal reducers for their macrophotography? In theory, lenses with a large image circle relative to the sensor size used could be used with a focal reducer. This would decrease the magnification and ideally increase the resolution. My idea was that this could be useful when using spec...
by dickb
Sat May 23, 2020 4:53 am
Forum: Equipment Discussions
Topic: Etendue Mejiro lenses on eBay now
Replies: 41
Views: 2816

RobertOToole wrote:There are two versions OTO and OTH N.

I have one of each and spec sheets for both.

Both are excellent.

Do you mean OTH and OTH N? I know of the OTH (90mm) and the newer OTH F/V (92.7mm, 93.7mm) versions, with F standing for fixed aperture and V for variable.
by dickb
Sat May 16, 2020 4:10 am
Forum: Equipment Discussions
Topic: Schneider Componon 35mm f4 4/35 Lens Test Online
Replies: 32
Views: 3787

RobertOToole wrote:BTW, I have a big test I'm working on this weekend BTW that should be interesting to everyone, 1-3x. Looking forward to it. I'll post some info soon! :D
Sounds fascinating - if there is any proofreading that needs doing let me know.
by dickb
Tue May 12, 2020 12:33 pm
Forum: Equipment Discussions
Topic: Recommendation for machinist in UK for microscope adapter?
Replies: 6
Views: 590

I would recommend contacting Rafael from RafCamera. He makes a lot of adapters, I see he has made some for Olympus dovetails, one he describes as a 42mm dovetail for a BH2, the other a 46mm dovetail for a BX40. He should be able to make what you are after. There may be some delay with shipping from ...
by dickb
Wed Apr 15, 2020 2:36 am
Forum: Equipment Discussions
Topic: Computer screen
Replies: 19
Views: 2901

Dickb, are you colour blind (to some degree)? What do you see here? Screen based Ishihara tests aren't that reliable, but I can discern a 7 for the first digit and and both a 1 and 4 for the second. At first glance I may say 71. Most people perceive red as more of a distinctive bright hue than I do.
by dickb
Tue Apr 14, 2020 3:30 am
Forum: Equipment Discussions
Topic: Computer screen
Replies: 19
Views: 2901

Re: Computer screen

if there is a place where you can actually go and see various monitors in action that would be more more useful to you than our opinions I presume. Because of corona, other than super markets and a few other places, everything here is closed and sold by shipping only for the foreseeable future. Ind...
by dickb
Mon Apr 13, 2020 8:57 am
Forum: Equipment Discussions
Topic: Computer screen
Replies: 19
Views: 2901

Re: Computer screen

It really sounds like the difference in colours between them might not matter that much to me since I'm colourblind. I guess this is what I'm trying to determine. There is a whole spectrum of what people call colourblindness. Unless your version is on the more extreme end my guess is differences in...
by dickb
Sun Apr 05, 2020 12:11 pm
Forum: Equipment Discussions
Topic: Bellows for Canon EOS
Replies: 18
Views: 2794

Another I recommend is the Soligor Multiflex bellows. It's compatible with the Pentax bellows and my Mamiya bellows, which tells me that Pentax and Mamiya simply takes their bellows and paint a logo on. /Edit/ Close but not exactly. My guess is that the same factory made all the bellows but in two ...