Welcome to our community

Be a part of something great, join today!

Log in
  • Hey all, just changed over the backend after 15 years I figured time to give it a bit of an update, its probably gonna be a bit weird for most of you and i am sure there is a few bugs to work out but it should kinda work the same as before... hopefully :)

RPP macro?

Roberto Lequeux

Roberto Lequeux

Well-known member
Joined
Jan 3, 2007
Messages
5,403
Reaction score
0
Points
0
Location
Los Angeles
I am looking at this:
LENSSpecsV12.png


It seems that, for example on the 50mm, the 6" minimum distance would give you an extreme close up, like one eye or about the size of a playing card, that sort of shot. It also seems to me that all others would give you about the same.

What is the best "macro" RPP? And what is the size of the frame at their minimum focusing distance?

And what would that lens give you if you shot 2k? 3k? That way you might get into decent macro territory, correct?
 
The horizontal view of a 50mm lens focused at 6" is about 3". Sure, you can switch to 2K and effectively have a "100mm" that focuses to 6" for a view that is only about 1.5" wide. True macro lenses generally focus closer than 6" though.

With shorter macro lenses, you do have the issue of having the camera and lens so physically close to the subject that it's hard to light around all of that.
 
David I can't wait till you publish, so I can get my signed edition. :smilewinkgrin:
 
The 50mm at 2k should work for the more important part of the shot I am concerned with. I want to be able to see snow flakes. They can get large enough for a 1.5" horizontal frame. We just need to shoot it whenever we get big snowflakes, and hope for them. However you point out something that is also of my concern David. Thank you.

A longer lens might let me get the shot I initially intended: A snow flake being crushed by something landing on it. Though it would have to be very long lens since I am talking about a snowmobile's track. :)

I guess the only way to get that shot would be to rent a remote head and put the camera in a cage. We need to pan up to see the snowmobile speeding away.

So perhaps composting big snowflakes into the snowmobile shot would be the solution?

What is the minimum focus of the 300mm?
 
Please note that the minimum focus from the sensor plane is in fact 12", not 6". In cine lenses, focus is measured from the imaging plane (the sensor), not from the front of the lens.
 
Mitch Gross said:
Please note that the minimum focus from the sensor plane is in fact 12", not 6". In cine lenses, focus is measured from the imaging plane (the sensor), not from the front of the lens.
Click to expand...

Yes, I am aware of this Mitch. I am assuming that RPPs focus a little closer than 12", I can't remember if they do. I figured someone would correct me if I assumed wrong. It might be good to at least add a little asterisk clarifying this at the bottom of the chart.

I would love to get a rough idea of the minimum focusing distance for the 300mm if someone has one, I would really appreciate it.
 
Roberto Lequeux said:
I am assuming that RPPs focus a little closer than 12"
Click to expand...

It says it right on the chart. "Close focus from sensor" For the 50mm it is 12". Don't think they could make it any clearer than that.

The MOD (minimum object distance) is the physical distance an object can be from the front of the lens and be able to get in focus. In the case of the 50mm it is 4" (because the lens is 8" long). This is why the MOD is the same as the "Close Focus from Front Lens." Because they are two ways of saying the same thing.
 
I blame you for my confusion Mitch. Why even bring it up then? ;) I've been reading Reduser with one eye only, the other still focused on work so forgive my all-over-the-place'ness.

I really hope someone can share the MOD for the 300mm.
 
Roberto Lequeux said:
Yes, I am aware of this Mitch. I am assuming that RPPs focus a little closer than 12", I can't remember if they do. I figured someone would correct me if I assumed wrong. It might be good to at least add a little asterisk clarifying this at the bottom of the chart.

I would love to get a rough idea of the minimum focusing distance for the 300mm if someone has one, I would really appreciate it.
Click to expand...

Hi Roberto,

Red Pro 300mm has 8' close focus
 
Awesome, thanks!

So judging by a 50mm at 6" giving you 3" or 1.5" at 2k I suppose a 300mm with 8" would give you something more like 1cm (3/8") at closest focus in 4k? Is there an online calculator that can help me with this stuff? That way I don't have to keep pestering everyone. : )
 
Jon B. said:
Hi Roberto,

Red Pro 300mm has 8' close focus
Click to expand...

close focus from lens front is 7.36 ft

From Image plane, minimum marked focus distance is just under 8'.
 
But of course. Thanks for clarifying that Jarred. I am going to blame this last confusion of mine on lack of coffee on a late start to my day, and the empirical system with the easily confused ' and ". That would make it a super bad-ass macro and everyone and their mother would know about it already. :blush:

So the appropriate question would be, what is the size of the frame at 8 feet on a 600mm (2k)?
 
You must log in or register to reply here.
Back
Top