OPINION
DALLY, Judge.These are appeals from convictions for the possession of more than four ounces of marihuana. The cases were consolidated for trial; punishment in each case was assessed at imprisonment for four years.
The sole ground of error advanced by the appellants is that the trial court erred in overruling a motion to suppress the evi*382dence obtained under a search warrant; the appellants assert that the information showing probable cause to support the warrant was obtained by an unlawful warrant-less search.
The search warrant was issued and executed on August 23, 1977, for the Wheeler property. These premises, located on a seventy-four acre tract of land in rural Lampa-sas County, included á greenhouse, a residence and a barn.
The affidavit supporting the warrant recited that the affiant, Deputy Sheriff Bob McClinton, had observed through a telescopic lens that there were marihuana plants growing in the greenhouse on the property.
To discuss the appellant’s claim that this telescopic observation constituted an unlawful search, a brief discussion of the facts leading to the execution of the search warrant is necessary.
Lampasas County Deputy Sheriff Gordon Morris testified that he and other officers began surveillance of the Wheeler property in mid-July of 1977, prompted by information that no one was allowed to enter the fenced property without first telephoning, or being escorted from the gate, and that there was a large greenhouse within the fenced property which was surrounded by an additional fence.
Deputy Morris described the greenhouse as constructed “of clear plastic,” and explained that in the sunlight he could see something green inside. He also testified that there was “a large louvered opening” on the west end of the greenhouse, approximately four feet square, and there was a fan inside the greenhouse on the other side of the louvered opening. The louvers of the opening were between four and six inches apart, and opened to permit ventilation of the greenhouse.
While on a public road about a mile away Deputy Morris looking with a pair of eight by fifty binoculars could see through the louvered opening in the greenhouse. He saw growing green plants but could not identify them. He returned various times to observe the greenhouse through the binoculars, but could form no definite conclusion about the type of plants he saw. Thereafter, with the permission of Mr. Maurice Garner, Deputy Morris and other officers observed the greenhouse with binoculars from the Garner property about 100 yards west of the greenhouse. Deputy Morris tentatively identified the plants he could see in the greenhouse as marihuana. He returned after dark to the Gamer property, accompanied by Lampasas police officer Tim Angermann and Deputy Sheriff McClinton. They observed the greenhouse through a night vision telescope, but with the telescope were unable to see into the greenhouse. On August 23, 1977, a few days later, at between four and five o’clock p.m. Deputies Morris and McClinton returned to the Garner land accompanied by city patrolman Gilbert White and Lampasas detective David Romack. Using a 600 millimeter telephoto lens, they were able to see through the louvered opening in the greenhouse, and to positively identify the plants as marihuana. Believing that their surveillance had been detected by a man who came around the corner of the greenhouse, Deputy McClinton returned to the Sheriff’s Department, drafted an affidavit, and obtained a search warrant which was executed that night. Testimony concerning the marihuana found on the premises was admitted.
The greenhouse was approximately two hundred yards from the house, and was connected to the house by a well-traveled road. The photographs of the premises admitted into evidence show that fences around the greenhouse and the property were of wire. A chain-link gate to the property was posted with two signs: “Beware of dogs” and “If gate locked — honk twice or check back later at: 556-3997. Thank you, Mrs. Wheeler.”
The appellants, relying on Katz v. United States, 389 U.S. 347, 88 S.Ct. 507, 19 L.Ed.2d 576 (1967), contend that the telescopic observation of the greenhouse was an unconstitutional search. In Katz the Supreme Court made clear that “[t]he Fourth Amendment protects people, not places. *383What a person knowingly exposes to the public, even in his own home or office, is not a subject of Fourth Amendment protection.” Accord, Turner v. State, 499 S.W.2d 182 (Tex.Cr.App.1978); Long v. State, 532 S.W.2d 591 (Tex.Cr.App.1975). Rejecting the argument that a physical intrusion into a given enclosure is necessary to find a search, the Court held that the proper focus is whether the government’s activities violated the privacy upon which the defendant justifiably relied.
In the recent case of Smith v. Maryland, 442 U.S. 735, 99 S.Ct. 2577, 61 L.Ed.2d 220 (1979), the United States Supreme Court reiterated that the proper focus in determining whether there has been a search under the Fourth Amendment is whether a “justifiable,” “reasonable,” or “legitimate expectation of privacy” has been invaded. This determination, the Court stated,
“normally embraces two discrete questions. The first is whether the individual, by his conduct, has ‘exhibited an actual (subjective) expectation of privacy,’ .. . whether ... the individual has shown that ‘he seeks to preserve [something] as private ... The second question is whether the individual’s subjective expectation of privacy is ‘one that society is prepared to recognize as “reasonable,”’ ... whether ... the individual’s expectation, viewed objectively, is ‘justifiable’ under the circumstances.”
The Court in Smith concluded that the installation and use of a pen register which recorded the telephone numbers that the defendant dialed on his home telephone did not constitute a search. The Court found that even if the defendant had some subjective expectation that the numbers he dialed would be private, he could not claim a “legitimate expectation of privacy” in the numbers because he had voluntarily conveyed the information to the telephone company. He assumed the risk that the information he had “exposed” would be revealed.
Appellants argue that under a Katz and Smith analysis they had a reasonable expectation of privacy in the contents of the greenhouse. They say that the opacity of the greenhouse, the double enclosure, the signs on the locked gate of the outer fence, all show appellants’ subjective expectation that the contents of the greenhouse would remain private, and “objectively, it is equally clear that the actions of Appellants were recognized by the police as efforts to maintain privacy.” The appellants contend that the use of the telephoto lens to observe the contents of the greenhouse was an unconstitutional invasion of this reasonable expectation of privacy.
We disagree. For reasons which will be stated, we conclude that the telescopic observation of the greenhouse was not a search under the Fourth Amendment.
In Johnson v. State, 469 S.W.2d 581 (Tex. Cr.App.1971), the police acting on an anonymous tip went to the defendant’s apartment. They knocked on the door, and when no one answered, they looked into a window through a two inch gap between partially drawn draperies, and saw what appeared to be stolen merchandise. A search warrant was obtained on the basis of this observation. The Court rejected the contention that the window observation was a search, stating:
“Under this set of facts, we cannot say that appellants could ‘reasonably assume that they were free from uninvited inspection through the window’ and we must hold that no search protected by the Fourth Amendment occurred.”
469 S.W.2d at 584.
In Turner v. State, 499 S.W.2d 182 (Tex. Cr.App.1973), a police officer investigating a tip that marihuana was being used in the defendant’s house looked through a window and saw the defendant and two other persons smoking a pipe filled with what appeared to be marihuana. The Court noted that there were apparently no blinds or curtains on the window, and that the officer had made his observation from the premises next door. Under the Katz rationale, the Court refused to find that a search had taken place, stating “[i]t is not a search to observe that which is open to view.” The Court noted that:
*384“This court had previously stated [in Gil v. State, 394 S.W.2d 810 (Tex.Cr.App. 1965)] the rule is that when one is so foolish as to leave his windows unsecured he may not complain if another observes an illegal act being committed therein. See also Giacona v. State, 372 S.W.2d 328 (Tex.Cr.App.1963), cert, denied, 375 U.S. 843, 84 S.Ct. 92, 11 L.Ed.2d 70, and Cro-well v. State, [147 Tex.Cr.R. 299, 180 S.W.2d 343 (Tex.Cr.App.1944) ]”
499 S.W.2d at 184.
In Long v. State, 532 S.W.2d 591 (Tex.Cr. App.1975), a sheriff and deputy had gone to a house-on rural property in Wise County to inquire about suspicious aircraft flights from the property. They knocked but received no response, so they continued around the house to return to the car. Through an open uncurtained window they felt a blast of heat, detected a strong marihuana odor, and saw a fan and heater and a substance covering the floor and stacked around the walls. The Court, quoting with approval from Turner, found that this observation did not constitute a search:
“[I]t is the duty of a policeman to investigate, and we cannot say that in striking a balance between the rights of the individual and the needs of law enforcement the Fourth Amendment itself draws the blinds the occupant could have drawn but did not.”
532 S.W.2d at 595.
The appellants seek to distinguish these cases from the present case by pointing to the fact that in Turner, Johnson, and Long the observations through open windows were made without visual aids.
However, this distinction does not necessarily bring the visually aided observation in the present case within the ambit of a search under the Fourth Amendment. Several cases have declined to find that under the Katz analysis the use of visual aids to detect activities in private premises constitutes a search. In Fullbright v. United States, 392 F.2d 432 (10th Cir.), cert, denied, 393 U.S. 830, 89 S.Ct. 97, 21 L.Ed.2d 101 (1968), police concealed themselves on the defendant’s farm, and, with binoculars, observed through the open door of a shed the defendant and two others operating a still inside the shed and they saw the defendant load bottles of distilled spirits from the shed into an automobile. They followed the automobile and arrested its occupants after a search of the vehicle revealed several bottles of illegal distilled spirits. The Court noted that the police made their observations from a location outside the curtilage. While being careful to state that “we do not mean to say that surveillance from outside a curtilage under no circumstances could constitute an illegal search in view of the teachings of Katz v. United States [citation omitted],” the Court found that under the facts of the case before it the defendant had failed to carry his burden of showing the visually aided observation was an intrusion on a protected area or person.
In Commonwealth v. Hernley, 216 Pa.Super. 177, 263 A.2d 904, 48 A.L.R.3d 1172, cert, denied 401 U.S. 914, 91 S.Ct. 886, 27 L.Ed.2d 813 (1971), an FBI agent keeping surveillance on defendant’s printshop noticed one evening that the printshop presses were being operated. The windows were so high he could not see what was being printed from his position on the ground, so he mounted a four-foot ladder placed on railroad tracks abutting the property. From this position thirty to thirty-five feet distant he looked through binoculars into a side window of the shop and could see football gambling forms being run off the presses. The defendants argued that this was an unlawful search into an area in which they had a reasonable expectation of freedom from governmental observation. The Court rejected this argument, holding,
“Our case presents the situation in which it was incumbent on the suspect to preserve his privacy from visual observation. To do that the appellees had only to curtain the windows. Absent such obvious action we cannot find that their expectation of privacy was justifiable or reasonable. The law will not shield criminal activity from visual observation when the actor shows such little regard for his privacy.”
*385In State v. Manly, 85 Wash.2d 120, 530 P.2d 306, cert, denied sub. nom. Mclntire v. Washington, 423 U.S. 855, 96 S.Ct. 104, 46 L.Ed.2d 81 (1975), the court declined to find that an unlawful search had occurred when a policeman, informed that plants resembling marihuana were growing in the second floor window of the defendant’s apartment, had used binoculars to view the plants from his car across the street and from the public sidewalk below. The Court noting that the United States Supreme Court had, at least inferentially, approved the use of binoculars, in On Lee v. United States, 343 U.S. 747, 72 S.Ct. 967, 96 L.Ed. 1270 (1952); United States v. Lee, 274 U.S. 559, 47 S.Ct. 746, 71 L.Ed. 1202 (1927); followed the reasoning in Hernley and Full-bright in concluding that no search had taken place.
The court in Commonwealth v. Williams, 262 Pa.Super. 508, 396 A.2d 1286 (1979) found that police observation from the third floor of a building into defendant’s third floor uncurtained windows, both with binoculars and with a startron — a device enabling the observer to see into dark areas — , was not an unlawful search, stating:
“Considering all the factors advanced by appellant, — The location of the apartment, the duration of the surveillance, the use of binoculars and of the star-tron — it remains irrefutably clear that just as in Hernley, the occupants in the apartment could have precluded all observation by the single expedient of curtaining or otherwise covering the windows. Applying the standard of a balancing of interests between the security of public order by detection and prevention of crime and a person’s immunity from police interference in his privacy, we find that the surveillance in the case did not violate the appellant’s fourth amendment rights.”
Other courts have also concluded under analogous circumstances that visually aided observations did not invade reasonable expectations of privacy. See United States v. Allen, 633 F.2d 1282 (9th Cir.1980) (helicopter and binocular surveillance of activities on defendant’s ranch); United States v. Grimes, 426 F.2d 706 (5th Cir.1970) (observation through binoculars of defendant placing untaxed whiskey in automobile); United States v. Minton, 488 F.2d 37 (4th Cir.1973), cert. denied 416 U.S. 936, 94 S.Ct. 1936, 40 L.Ed.2d 287 (observation from embankment through binoculars of activities in and around warehouse); People v. Hicks, 49 Ill.App.3d 421, 7 Ill.Dec. 279, 364 N.E.2d 440 (1977) (use of night binoculars to look through uncurtained hotel room window at 1:00 a.m.); State v. Thompson, 196 Neb. 55, 241 N.W.2d 511 (1976) (night observation with binoculars from alley into undraped house windows.)
The appellants cite United States v. Taborda, 635 F.2d 131 (2d Cir.1980); United States v. Kim, 415 F.Supp. 1252 (D.Haw.1976); People v. Arno, 90 Cal.App.3d 505, 153 Cal.Rptr. 624 (1979) to support their contention. In Taborda the court held that unenhanced observations of objects and activities inside a home do not impair a legitimate expectation of privacy, but that “any enhanced viewing of the interior of a home does impair a legitimate expectation of privacy.” The failure to preclude observation by curtaining the window does not rebut this expectation, under the court’s analysis. Accordingly, the court found that telescopic observation by police of the inside of the defendant’s apartment through an uncur-tained window from an apartment across the street was an unlawful search.
Similarly, the court in United States v. Kim, supra, rejecting the reasoning of Hernley and Fullbright, held that FBI agents’ telescopic surveillance of defendant’s gambling activities inside his apartment invaded an area in which the defendant had a reasonable expectation of privacy. The court, distinguishing visually aided surveillance of “non-private” places, and unaided surveillances of activities within homes, found the visually aided surveillance of a home to be a search. The court refused to conclude that the defendant, by leaving his curtains open, forfeited his reasonable expectation of privacy.
*386In People v. Arno, supra, the police used binoculars to look from a hilltop into the eighth floor window of a business suite being used as a distribution center for pornographic films. The court, relying on Kim, found an invasion of the defendant’s reasonable expectation of privacy. The majority found that an individual has a reasonable expectation of privacy to that which cannot be seen by the naked eye nor heard by the unaided ear.
We are not persuaded by the reasoning of these cases. Applying the standards set out in Katz and further explained in Smith v. Maryland, supra, we conclude that the appellants have not shown a legitimate expectation that the contents of the greenhouse would remain private. The appellants say that their subjective expectation of privacy is shown by the double enclosure of the greenhouse and the fact that it is opaque. We note that the wire fences surrounding the pr„ p'erty and the greenhouse may have shown the appellants’ intentions to prevent physical intrusion into the property, but the fences offered no impediment to visual observation. Compare United States v. Williams, 581 F.2d 451 (5th Cir.1978), cert, denied 440 U.S. 972, 99 S.Ct. 1537, 59 L.Ed.2d 789 (1979). Similarly the United States Supreme Court noted in Katz that the defendant by closing the door of the partially glass-walled telephone booth had shown that he intended to exclude the uninvited ear but not the intruding eye.
However, even if the appellants did have a subjective expectation that the contents of the greenhouse would remain private, we find that under the facts of this case such expectation is not “one that society is prepared to recognize as ‘reasonable.’ ” Since the appellants did not curtain or otherwise obscure the view into the greenhouse afforded by the four foot square louvered opening, they forfeited their expectation of privacy and could not justifiably assume that the interior of the greenhouse would remain free from observation. See Long v. State, supra; Turner v. State, supra; Johnson v. State, supra. See also Smith v. Maryland, supra. The police made their observations from a place in which they were lawfully entitled to be. Cf. Phelan v. Superior Court, 90 Cal.App.3d 1005,153 Cal. Rptr. 738 (1979). The visual aids which the police used in their surveillance of the greenhouse did not change the character of their lawful observation to a search under the Fourth Amendment. See Fullbright v. United States, supra; Commonwealth v. Hernley, supra; United States v. Allen, supra. See also United States v. Lee, supra; On Lee v. United States, supra.
The protections of the Fourth Amendment do not restrict the police to the use of their unaided senses and physical abilities. See United States v. Allen, supra; United States v. Dubrofsky, 581 F.2d 208, 211 (9th Cir.1978). Devices which enhance the senses, such as the binoculars, night vision telescope and telephoto lens used in the present case, and techniques such as aircraft surveillance, also used in this case, may increase police effectiveness and contribute to surveillance without violation of the Fourth Amendment.
The judgments are affirmed.